Imagine standing on a hillside farm in Holualoa, Hawaii, the Pacific Ocean glittering thousands of feet below, a warm cup of herbal tea cradled in both hands. The air smells of volcanic earth and coffee blossoms. You take a slow sip and think: could what's in this cup be doing your kidneys a quiet favor?
It's a question worth asking seriously. Your kidneys filter roughly 200 liters of blood every single day. They pull out waste, regulate blood pressure, balance electrolytes, and produce hormones your body depends on. They work without rest, without complaint, and mostly without your attention. That invisibility can be a problem. By the time most people notice kidney function declining, years of lifestyle strain have already accumulated.
That's where the conversation about tea for kidney health and which herbs support renal function becomes genuinely useful. Tea is not medicine. No cup of nettle leaf or mamaki or hibiscus will reverse kidney disease or replace the guidance of a physician. But a growing body of research suggests that certain herbs, consumed consistently as part of a broader healthy lifestyle, can contribute to the kind of antioxidant protection and blood pressure support that kidneys need most.
At Buddha's Cup, we grow mamaki and hibiscus on our farm here in Holualoa on the Big Island of Hawaii. Both plants appear prominently in this article, and not because we grow them. They appear because the research on both is genuinely compelling, and because we believe in being honest about what plants can and cannot do. We've also written more broadly about teas for digestion and kidney health and about Hawaiian herbal teas for kidney support if you'd like to explore those angles alongside this one.
What follows is a thorough, honest, and practical guide. We'll cover how the kidneys work, what the science actually says about herbal teas and renal function, seven specific herbs backed by research, a deep dive into mamaki as Hawaii's native contribution to this conversation, and how hibiscus connects blood pressure management to kidney health. We'll finish with a practical daily tea routine you can build right now, along with the safety considerations you need to know.
Pour yourself something warm and read on.
How Your Kidneys Work and Why Herbal Support Matters
Before we can talk meaningfully about herbs that support renal function, it helps to understand what the kidneys are actually doing all day. Most people know the kidneys filter waste. That's true, but it barely scratches the surface. The kidneys are among the most metabolically complex organs in the body, and understanding their full scope of work explains why they're so vulnerable to lifestyle strain and why antioxidant-rich, anti-inflammatory herbs could genuinely make a difference.
The Kidneys' Core Jobs: Filtration, Balance, and Beyond
Each kidney contains about one million tiny filtration units called nephrons. Blood passes through these nephrons continuously, day and night. The nephrons separate what your body needs to keep from what needs to be excreted. Waste products like urea and creatinine get routed to the bladder. Nutrients, hormones, and water get recirculated according to what your body requires at that moment.
Beyond filtration, the kidneys regulate blood pressure through a hormone system called the renin-angiotensin system. When blood pressure drops, the kidneys release renin, which triggers a cascade that constricts blood vessels and signals the body to retain sodium. When pressure is too high for too long, those same kidneys absorb the strain. This is one of the most important connections in the entire kidney health conversation: high blood pressure damages kidneys, and damaged kidneys struggle to regulate blood pressure. It becomes a cycle that feeds itself.
The kidneys also balance electrolytes including sodium, potassium, calcium, and phosphorus. They regulate the pH of your blood. They produce erythropoietin, a hormone that tells bone marrow to make red blood cells. And they activate vitamin D, which your body needs for bone density and immune function. All of these jobs are interconnected. A strain on filtration ripples into hormone production, which ripples into blood chemistry, which ripples into energy and bone health. The kidneys are not a single-function organ. They are a central hub of whole-body balance.
What Puts Kidneys Under Pressure
Understanding what strains the kidneys helps explain why certain herbal compounds are relevant. The two biggest lifestyle-driven threats to kidney function are chronic high blood pressure and high blood sugar. Hypertension physically damages the delicate blood vessels feeding the nephrons. Elevated blood glucose, sustained over time, creates a pro-inflammatory, pro-oxidative environment inside the kidneys that accelerates damage. Both conditions are increasingly common. Both are significantly modifiable through lifestyle choices.
Dehydration is another underappreciated threat. When fluid intake is chronically low, the kidneys concentrate urine to compensate, increasing the risk of kidney stones and putting extra workload on tissue that needs constant flushing to function well. This is worth noting because one of the simplest benefits of a tea habit is hydration. Replacing a sugary soda or a second cup of coffee with an herbal tea adds fluid without adding sugar, artificial ingredients, or excess caffeine.
Excess sodium and processed food create a high-solute load the kidneys must work harder to clear. Alcohol taxes the kidneys' ability to manage fluid balance. Certain medications, including common over-the-counter painkillers like ibuprofen and naproxen, can reduce blood flow to the kidneys when used chronically, contributing to cumulative damage over years. This context matters because it frames herbal tea not as a miracle fix but as one sensible choice among many that collectively add up to better renal health.
Where Herbal Teas Fit Into a Kidney-Supportive Lifestyle
Herbal teas are a complementary tool, not a treatment. That distinction is important and we'll keep returning to it. But within that honest framing, there are three mechanisms through which certain herbs have shown the most promise for renal support. The first is antioxidant activity, which helps neutralize the oxidative stress that damages kidney tissue. The second is anti-inflammatory effects, which address one of the root drivers of progressive kidney disease. The third is mild diuretic action, which can support fluid clearance and reduce the burden on kidneys managing excess fluid retention.
Beyond these specific mechanisms, the act of replacing less healthy beverages with herbal tea produces a measurable benefit simply through improved hydration. Kidneys function better when they have adequate fluid to work with. As noted in research compiled by Very Well Health, no teas can treat or reverse kidney disease, but certain types of tea can be part of a kidney-friendly routine. That is exactly the spirit in which we're presenting this information.
If you'd like to explore the broader landscape of which herbs support renal function or learn more about the general benefits of herbal infusions, we have resources on both. But first, let's look at what the research actually says about how tea interacts with the kidneys at a biochemical level.
The Science Behind Tea and Renal Function
When people ask whether tea is good for the kidneys, they're often looking for a simple yes or no. The honest answer is more nuanced, and it's worth spending time with that nuance. The science here is real but still developing. Knowing what the research shows, and what it doesn't, makes you a more informed consumer of both information and herbal tea.
Antioxidants and the Kidneys: Why Oxidative Stress Matters
The kidneys are metabolically active around the clock, filtering blood continuously and performing constant biochemical work. That high metabolic activity generates reactive oxygen species, which are unstable molecules that damage cells and tissue when they accumulate. This process is called oxidative stress, and the kidneys are particularly vulnerable to it because of how much energy they consume and how much blood they process.
Polyphenols, the broad class of antioxidant compounds found in plants, help neutralize reactive oxygen species before they cause damage. Among the most studied polyphenols for kidney health is EGCG, or epigallocatechin-3-gallate, found primarily in green tea. Research highlighted by Eating Well indicates that EGCG may help protect against certain types of kidney damage, working through multiple pathways in kidney tissue simultaneously. It doesn't simply mop up reactive oxygen species. It also modulates the cellular signaling that triggers inflammation and cell death.
Chlorogenic acids, rutin, and catechins, which are found in plants like mamaki and hibiscus, work through related antioxidant pathways. The overlap in mechanisms across different herbs is one reason that a diverse herbal tea routine may offer broader protection than relying on a single plant. Each herb brings a somewhat different polyphenol profile, and together they create a wider net of antioxidant coverage. You can read more about the antioxidant profile of some of our farm's botanicals in our piece on Kona coffee and antioxidant content, which also touches on how volcanic soil and high-altitude growing conditions influence polyphenol concentration in plants.
Anti-Inflammatory Pathways and Renal Protection
Chronic inflammation is widely recognized as a primary driver of progressive kidney disease. When the kidneys are under sustained inflammatory stress, nephrons deteriorate over time and filtration capacity decreases. The body tries to compensate by taxing the remaining healthy nephrons harder, which accelerates their wear. It's a degenerative cycle, and interrupting it early matters enormously.
Several herbs work through anti-inflammatory pathways that are relevant to this process. Ginger, astragalus, and nettle leaf are among the most studied in this context. Research compiled by Liv Hospital International indicates that astragalus (Astragalus membranaceus) has been shown to improve renal function and survival outcomes in patients with kidney disease, with the mechanism understood as a combination of enhanced antioxidant defense and reduced inflammatory signaling. These aren't folk medicine claims; they're outcomes observed in clinical settings, though as we'll discuss next, those clinical settings come with important caveats.
The key point about anti-inflammatory benefits from herbal teas is that they are most meaningful as a long-term, consistent practice. Drinking ginger tea once after a large meal won't measurably change your kidney's inflammatory environment. Drinking anti-inflammatory herbal teas daily for months and years, as part of a lifestyle that also limits processed food and manages blood pressure, is where the cumulative benefit becomes real. This is not a quick-fix conversation. It's a lifestyle conversation.
What the Research Can and Cannot Tell Us
Intellectual honesty requires acknowledging the limitations of the existing research. Most clinical trials on herbal teas and kidney health involve small numbers of participants. Many studies are conducted in animal models rather than human subjects. The duration of most trials is too short to draw conclusions about long-term kidney function. And the specific herb preparations used in research often differ significantly from the teas consumers can purchase. All of this limits generalizability.
As noted by practitioners at Lam Clinic who specialize in integrative medicine, no herbal tea has been proven to improve kidney function in a clinical sense. That's a fair statement. It's also not the end of the story. Absence of definitive proof is not proof of absence. Research on plant-based compounds and kidney health is ongoing, and preliminary findings are consistently promising enough to justify continued investigation and reasonable personal interest.
The most grounded conclusion the research supports is this: drinking antioxidant-rich, anti-inflammatory herbal teas daily as part of a broader healthy lifestyle, one that includes adequate hydration, managed blood pressure, controlled blood sugar, and reduced processed food intake, produces the most meaningful outcomes for long-term kidney function. Tea is a piece of that puzzle, not the whole picture. Exploring the benefits of wildcrafted herbal teas in wellness rituals can give you a broader sense of how traditional herbal culture has approached this kind of daily, cumulative practice across generations.
Seven Herbs That Research Links to Kidney Support
Now we get to the practical heart of the article. If you're building a tea habit with kidney health in mind, these are the herbs that the available research points to most consistently. We've grouped them by their primary mechanism so you can understand not just what to drink but why it matters. Each herb brings something specific to the table, and knowing that specificity helps you make informed choices rather than just reaching for whatever the supplement aisle suggests.
Herbs That Support Filtration and Fluid Balance
Healthy kidneys manage fluid balance continuously. When that balance is compromised, fluid retention, elevated blood pressure, and increased strain on the nephrons can follow. These three herbs have traditional and research-supported histories of supporting healthy urinary output and fluid clearance.
1. Nettle Leaf
Nettle leaf, from the plant Urtica dioica, has one of the longest traditional histories of any herb used for urinary and kidney support. It's a mild, natural diuretic, meaning it gently encourages the kidneys to produce more urine and clear excess fluid. It's also anti-inflammatory and unusually rich in minerals including iron, magnesium, and calcium, making it a nutritive herb as well as a functional one.
Research compiled by HB Magazine identifies nettle leaf tea as one of the most commonly cited options for kidney and urinary tract support among herbal practitioners and in published literature. Its flavor is mild and grassy, which makes it easy to blend with other herbs. If you're new to kidney-supportive teas and want a gentle starting point, nettle leaf is a reasonable first choice. It pairs well with ginger for added anti-inflammatory benefit, or with lemon and honey for palatability.
2. Dandelion Root
Dandelion root is among the most well-studied herbal diuretics available. Research compiled by Science Insights, drawing on the USDA nutrient database, identifies up to nine distinct compounds in dandelion with diuretic properties, including caffeic acid, chlorogenic acid, and mannitol. That diversity of active compounds is notable. It suggests dandelion's diuretic action is multimechanistic rather than dependent on a single pathway, which may make it more robust in practice.
Beyond fluid balance, dandelion root supports liver function. The liver and kidneys work in tandem to clear toxins from the body. When the liver is functioning optimally, the kidneys carry a lighter burden. So dandelion root addresses kidney health both directly and indirectly.
One important caution: people who are already on pharmaceutical diuretic medications should speak with their physician before adding dandelion root to their routine. Combining herbal and pharmaceutical diuretics without guidance can disrupt electrolyte balance in ways that become problematic.
3. Corn Silk
Corn silk, the thread-like fibers found inside corn husks, is less well known than nettle or dandelion but has a documented history in folk medicine for urinary tract health. Research cited by Science Insights includes corn silk as a caffeine-free herbal option for kidney support, with traditional applications spanning urinary tract infections, kidney stones, and general urinary discomfort.
The active compounds in corn silk include flavonoids, polyphenols, and saponins, which together contribute to its anti-inflammatory and mild diuretic effects. Corn silk tea has a light, slightly sweet flavor that most people find pleasant. It's widely available as a loose-leaf or bagged herbal tea and blends easily with other kidney-supportive herbs.
Herbs That Target Inflammation and Oxidative Stress
As discussed in the science section, chronic inflammation and oxidative stress are the two most significant mechanisms through which kidney function deteriorates over time. These two herbs address those mechanisms directly.
4. Ginger
Ginger is probably the most familiar herb on this list, and its anti-inflammatory reputation is well earned. The active compounds in ginger, primarily gingerols and shogaols, inhibit inflammatory signaling pathways that have been linked to progressive kidney damage. Research highlighted by Liv Hospital International indicates that ginger may improve kidney function in people with chronic kidney disease, with researchers describing it as a promising addition to traditional treatment approaches.
What makes ginger particularly practical is its accessibility. It's available fresh, dried, or as a prepackaged tea in virtually every grocery store. Its warming, slightly spicy flavor is widely appealing. It blends naturally with lemon, honey, turmeric, and other anti-inflammatory herbs. For anyone building a daily kidney-supportive tea routine from scratch, ginger is an easy, evidence-supported starting point.
5. Astragalus
Astragalus (Astragalus membranaceus) is a root herb from traditional Chinese medicine with a track record that goes back more than two thousand years. Modern research is beginning to explain the mechanisms behind its traditional use. Liv Hospital International's research compilation indicates that astragalus has been shown in clinical studies to improve renal function and survival rates in patients with kidney disease, with the mechanism involving enhanced antioxidant defenses and reduced inflammatory activity at the cellular level.
Astragalus is less commonly found as a standalone tea than some other herbs on this list. It's more often incorporated into herbal blends or taken as a tincture or supplement. If you're interested in incorporating astragalus, seek out reputable sourcing. Quality varies significantly among herbal products, and the bioactive compound concentration in a poorly sourced product may be too low to deliver the effects observed in research.
Green Tea and Its EGCG Advantage
6. Green Tea (EGCG)
Green tea is the most extensively studied conventional tea for kidney health, and the research on it is more robust than what exists for most other herbs on this list. The primary active compound is EGCG, epigallocatechin-3-gallate, a catechin that has been shown to work through multiple protective pathways in kidney tissue simultaneously.
As noted by Eating Well, EGCG may help protect against certain types of kidney damage. Research compiled by Pinch of Health elaborates that EGCG acts through several mechanisms in kidney tissue, including reducing oxidative stress, moderating inflammatory signaling, and supporting healthy cell function in the nephrons. Among all the herbs discussed in this article, green tea has the largest body of human research supporting its use.
One consideration worth noting: green tea contains caffeine. For most healthy people, this is not a concern. But for those with advanced kidney disease or those who have been advised to limit caffeine intake, it's worth factoring in. If you need a caffeine-free alternative with a comparable antioxidant profile, mamaki, which we'll discuss in the next section, is a genuinely compelling option. You can read more about the general health benefits of green tea in our dedicated piece on the topic.
7. Hibiscus (Preview)
Hibiscus deserves a brief introduction here before its full featured section later in this article. Among all herbal teas studied for their relationship to kidney health, hibiscus has the strongest clinical trial record specifically for blood pressure reduction. Research compiled by Pinch of Health describes hibiscus as having a better-documented track record for lowering blood pressure than any other herbal tea.
This matters enormously for kidney health, because blood pressure is the single most significant lifestyle-driven threat to renal function. The connection between hibiscus, blood pressure management, and kidney protection is specific enough and important enough that it warrants its own dedicated section, which follows shortly. For now, consider hibiscus flagged as one of the highest-priority herbs on this list if blood pressure is a concern for you.
For further context on how traditional herbs have been incorporated into daily wellness practices across cultures, see our exploration of why drinking Hawaiian tea is good for you, and our discussion of the significance of traditional ingredients in iced teas.
Mamaki Tea: Hawaii's Native Kidney-Friendly Herb
Every plant on the previous list grows somewhere in the world. Nettle grows across Europe and North America. Dandelion is a global weed. Ginger originated in Southeast Asia. Astragalus comes from China. Green tea is grown across East Asia. But mamaki, Pipturus albidus, grows almost exclusively in the Hawaiian Islands. It is as native to this land as the nene goose or the silversword. And for anyone asking about tea for kidney health and which herbs support renal function, mamaki deserves special attention because of what it contains, what it lacks, and where it comes from.
What Is Mamaki and Why Does It Grow Here
Mamaki belongs to the nettle family, Urticaceae, which makes it a distant botanical relative of the nettle leaf teas discussed in the previous section. Unlike its stinging relative, mamaki doesn't sting. The leaves are smooth and broad, and the plant grows in the cool, misty forests of Hawaiian uplands. On the Big Island, it thrives at elevation on the slopes of Hualalai and Mauna Loa, in the same volcanic soil and cloud-kissed climate that makes Kona coffee exceptional.
Holualoa, where our farm sits, is located at approximately 1,400 feet above sea level. The mornings here are often cool and damp, the afternoons warm and clear, and the soil is rich with minerals from thousands of years of volcanic activity. These conditions produce coffee beans with the complex flavor Kona is famous for. They also produce mamaki with a robust polyphenol profile. The same terroir that feeds the coffee feeds the tea.
At Buddha's Cup, we grow mamaki on the farm. When visitors join us for a farm tour, they walk through rows of coffee trees and can also see the mamaki growing nearby, part of the same agricultural ecosystem that has shaped this hillside for generations. It's not a decorative addition. It's a working part of the farm, and the tea we produce from it is something we're genuinely proud of.
Native Hawaiians used mamaki for centuries before Western contact. Traditional Hawaiian healers, known as kahuna, incorporated mamaki into remedies for purification, digestive health, and general wellness. It was consumed as a tea steeped from fresh or dried leaves. This traditional use pattern aligns closely with what modern research is beginning to understand about the plant's bioactive compounds. For more on the traditional context, see our dedicated piece on mamaki tea's traditional Hawaiian benefits.
Mamaki's Antioxidant Profile and Kidney-Relevant Properties
What makes mamaki particularly relevant to this conversation is the specific class of compounds it contains. Mamaki leaves are rich in chlorogenic acids, rutin, and catechins. These are not obscure or minor compounds. They are the same polyphenol classes that appear throughout the kidney health research cited in this article.
Chlorogenic acids are present in high concentrations in dandelion root, one of the diuretic herbs discussed earlier. Research on chlorogenic acids indicates antioxidant and anti-inflammatory activity consistent with kidney-protective effects. Rutin is a flavonoid with documented anti-inflammatory properties and some preliminary research suggesting it may help reduce kidney stone risk by inhibiting the crystallization of certain minerals in urine. Catechins are the same compound class as the EGCG found in green tea, though mamaki's specific catechin profile differs from green tea's.
What mamaki offers that green tea does not is a completely caffeine-free experience. This is a meaningful advantage for anyone with advanced kidney disease who needs to moderate caffeine intake. It's also an advantage for those who want to drink multiple cups throughout the day, including in the evening, without disrupting sleep. A kidney-supportive tea routine is most beneficial when it's consistent and sustainable. Caffeine-free options make that consistency easier to maintain.
The anti-inflammatory and antioxidant properties of mamaki align directly with the two primary mechanisms discussed in the science section of this article. Mamaki hasn't been studied in clinical kidney-specific trials to the degree that green tea or astragalus has. It's important to be transparent about that. But its biochemical profile places it squarely in the category of herbs with plausible renal-supportive activity. You can explore more about mamaki's effects on immunity and inflammation in our piece on mamaki tea and immunity.
How Mamaki Fits Into a Daily Kidney-Supportive Routine
The practical appeal of mamaki is that it's genuinely easy to drink daily. Its flavor is mild and slightly earthy, with a clean finish and none of the bitterness that some people associate with green or black tea. It doesn't require honey or sweetener, though both complement it nicely. It can be served hot or iced. On a warm Kona afternoon, a tall glass of iced mamaki with a squeeze of lemon is a simple, refreshing, kidney-friendly drink that feels like a reward rather than a health obligation.
We steep mamaki for three to five minutes in water just below boiling, around 190 to 200 degrees Fahrenheit. Steeping too long can produce a slightly tannic note. At the right steep time, it's smooth and pleasant. For anyone who wants a morning ritual without caffeine, or an evening wind-down tea that won't interfere with sleep, mamaki fills that role beautifully.
If you're curious about mamaki's broader health context, we've written about mamaki as the caffeine-free health drink you need to try and about its benefits for digestion, which is a natural companion to the kidney health conversation since both organs are part of the same waste-processing system.
When you buy mamaki from Buddha's Cup, you're buying a tea grown in the place it belongs, in soil shaped by volcanoes, tended by people who understand the land. That origin story isn't just romantic. The growing conditions genuinely matter to the quality of what ends up in your cup.
Hibiscus Tea and Blood Pressure: The Kidney Connection
Of all the herbs associated with kidney-supportive properties, hibiscus has the most direct clinical connection to the number one threat to renal function: high blood pressure. This section explains that connection in detail, because understanding the mechanism makes the case for hibiscus far more compelling than simply being told it's good for kidneys.
How Blood Pressure Damages the Kidneys
To understand why hibiscus matters for kidney health, you first need to understand the specific way hypertension damages the kidneys over time. The nephrons, those tiny filtration units inside each kidney, are fed by a dense network of microscopic blood vessels. These vessels are delicate. They're designed to handle normal blood pressure within a specific range. When blood pressure is chronically elevated, those vessels are exposed to mechanical stress they weren't built to sustain.
Over time, the vessel walls thicken and stiffen in response to that pressure. Blood flow to the nephrons becomes restricted. With less blood reaching them, the nephrons can't filter as efficiently. Some stop functioning entirely. The remaining nephrons compensate by working harder, which eventually damages them too. This is the physiological story behind hypertension-induced chronic kidney disease. It's slow, it's silent, and by the time symptoms emerge, the damage is already significant.
Managing blood pressure is therefore one of the highest-impact interventions available for kidney health. Medications are the primary tool for people with clinically elevated readings. But in the complementary space, hibiscus tea has a research record for modest blood pressure reduction that is more consistent than any other herbal tea studied to date.
What the Research Says About Hibiscus and Blood Pressure
Multiple randomized controlled trials have examined hibiscus tea's effect on blood pressure, and the findings are consistently in the same direction. Hibiscus produces modest but meaningful reductions in both systolic and diastolic pressure in people with mildly to moderately elevated readings. Research compiled by Pinch of Health notes that hibiscus has a better clinical trial record for blood pressure reduction than any other herbal tea. This isn't a marginal finding. Among herbal interventions for blood pressure, hibiscus is consistently cited as the leader.
The active compounds responsible for this effect include anthocyanins, the pigments that give hibiscus its characteristic deep red color, along with other polyphenols that have been shown to inhibit angiotensin-converting enzyme (ACE), the same enzyme targeted by a class of pharmaceutical blood pressure medications. Hibiscus doesn't work as powerfully as ACE inhibitors. But its mechanism is real and pharmacologically coherent, which is more than can be said for most herbal blood pressure claims.
The antioxidant load in hibiscus is also substantial. Those anthocyanins are powerful free radical scavengers, and their protective effect in kidney tissue likely extends beyond blood pressure to direct antioxidant protection of the nephrons themselves. We've written more about hibiscus tea's blood pressure benefits specifically, as well as the broader health benefits of using hibiscus tea and what happens when you drink it regularly.
Hibiscus at Buddha's Cup: Grown in Hawaiian Sun
We grow hibiscus on our farm in Holualoa. The variety we cultivate, Hibiscus sabdariffa, is the same species used in the research on blood pressure. It thrives in the warm, sunny conditions of the Kona coast, and the calyces, the fleshy parts of the flower that are dried to make hibiscus tea, are harvested at peak ripeness when their anthocyanin content is highest.
Hawaiian hibiscus benefits from growing in a year-round warm climate with well-drained volcanic soil. The intensity of sunshine at this latitude drives robust anthocyanin production in the plant, as these pigments are partly the plant's own sunscreen. More sun often means more anthocyanins, and more anthocyanins mean a deeper color and a stronger antioxidant profile in the finished tea.
Hibiscus tea brewed from our dried calyces is tart, vibrant, and naturally caffeine-free. It can be enjoyed hot, but it's exceptional as an iced tea, especially on a warm Kona afternoon. We've written more about hibiscus tea in Hawaii and its antioxidants, the full flavor and benefits of Hawaiian hibiscus, and the health properties of hibiscus in