Can Medicinal Plants Help Treat Diabetes? A New Review of 16 Herbs Weighs In

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For centuries, healers across Africa, Asia, and the Mediterranean reached for plants, roots, and bark to treat what is now called diabetes. Modern medicine mostly set those remedies aside in favor of pills and injections. A sweeping new scientific review says the old instincts may have gotten something right, and researchers are starting to explain, in biological terms, why.

Diabetes ranks among the biggest health problems on the planet. Figures cited in the review put the number of adults living with the disease at roughly 589 million as of 2024, about 11 out of every 100 adults worldwide, with some 81% of them in developing countries. Because standard drugs often come with unwanted side effects, scientists have been circling back to the plant kingdom in search of options that are safer and easier to get.

Published in The Open Biochemistry Journal, the review gathered and analyzed existing research on 16 medicinal plants long used to manage blood sugar. Its authors looked at the natural chemical compounds in each plant and traced the biological routes those compounds seem to travel to bring glucose down. Across very different plants, regions, and healing traditions, the same handful of biological targets kept turning up in experimental lab and animal studies.

How Scientists Chose 16 Medicinal Plants for Diabetes

To build their list, researchers combed three major scientific databases, Scopus, ScienceDirect, and Google Scholar, for studies published between 2000 and 2025. After sorting through more than 1,200 records and dropping duplicates and papers that fell short of their standards, they settled on 54 studies covering the 16 species.

Those plants hail from very different corners of the world. Gymnema sylvestre, nicknamed “Gurmar,” grows across Asia, tropical Africa, Malaysia, and Sri Lanka and ranks among the most popular natural diabetes remedies. White mulberry trees are native to Europe and Asia. Pomegranate has served as medicine for centuries around the Mediterranean, the Middle East, India, and China. Red ginseng anchors much of Asian folk medicine. Even sugarcane, the source of table sugar, makes the list, carrying compounds that have shown indirect effects on the body’s use of sugar in lab studies.

Despite that botanical variety, the plants kept pointing toward the same core biological machinery. Their active compounds, a mix of flavonoids, plant antioxidants called polyphenols, and nitrogen-based compounds called alkaloids, appear to work several angles at once.

How These Plants Lower Blood Sugar

One route is the gut. Some compounds slow specific digestive proteins that break carbohydrates down into sugar. Slow those proteins, and sugar trickles into the bloodstream after a meal instead of flooding it, softening the spikes that put people with diabetes at risk. Gymnema sylvestre and a red seaweed called Gracilaria bursa-pastoris both showed this effect in lab testing.

A second route runs through the body’s insulin signaling system, the relay that tells cells to pull sugar out of the blood. In Type 2 diabetes, that relay breaks down. Several plant extracts appeared to strengthen key links in the chain. Chinese wisteria extract switched on a pathway that nudges muscle and liver cells to soak up more glucose in cell studies, and pomegranate flower extract did something similar in animals.

A third route targets cellular wear and tear caused by unstable molecules called free radicals. Diabetes both fuels and is fueled by that damage, which harms the liver, kidneys, and the insulin-making cells of the pancreas. Extracts from pomegranate peel, peanut shells, red ginseng, and an African medicinal plant called Vernonia amygdalina all strengthened the body’s natural defenses against it in animal studies.

Which Medicinal Plants for Diabetes Had the Best Evidence

Not every plant earned the same grade. Four rose to the top with the strongest support: Gymnema sylvestre, white mulberry, red ginseng, and pomegranate, each backed by several animal studies plus close looks at how they work.

Gymnema sylvestre pulled ahead of the pack. Authors describe it as one of the most heavily studied plants in the group, with compounds that seem to prod the pancreas into releasing insulin, shield its insulin-making cells, and help the body take up glucose. White mulberry’s two signature compounds boosted glucose uptake through two separate pathways at once. At the other end, peanut shells and sugarcane rested on thinner evidence, mostly antioxidant activity rather than direct effects on insulin or sugar absorption.

What’s Still Missing

Here’s the catch, and the authors are upfront about it. Nearly all the evidence comes from cell cultures or lab animals, not people. In their words, “For most of the medicinal plants reviewed, clinical studies are currently lacking.” What dazzles in a mouse or a petri dish can fizzle in a human body, where how a compound is absorbed, how long it lasts, and how it mixes with other drugs all count for a lot.

Comparing the studies proved tricky, too. Research teams used different extraction methods, different doses, and different animal models, so a compound might look mighty in one paper and meek in the next, for reasons no one can fully pin down. Blocking those carbohydrate-digesting proteins carries a downside as well, since the same trick can upset the stomach, a known drawback of some existing diabetes drugs that work the same way. Effective lab doses may also run far higher than anything a cup of herbal tea or a standard supplement could deliver.

So where does that leave the old remedies? Somewhere between folklore and pharmacy. Sixteen plants drawn from healing traditions on several continents keep aiming at the same biological targets, and that kind of agreement is what tends to draw drug developers in. For the hundreds of millions of people with diabetes, many in places where modern medicine is hard to reach, the payoff could be real. Getting there will take carefully designed human trials, better dosing guidance, and a good deal more work before any of these plants belongs on a prescription pad.

Disclaimer: This article summarizes a scientific review for general information only and is not medical advice. The plants discussed were studied mainly in laboratory and animal experiments, not in human clinical trials, and none are established treatments for diabetes. Do not start, stop, or change any diabetes medication or take herbal supplements without first talking to a qualified healthcare provider, as some plant compounds can interact with prescription drugs.

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