What Is Diabetisan? The Peruvian Herbal Blend for Blood Sugar, Explained

May 12, 2026

The first time a customer asked us about Diabetisan, we had to look it up. That was a few years ago. Now it's one of the more consistent sellers in our tea section, mostly from people who heard about it from a relative in Peru or stumbled across it while researching natural support for blood sugar.

So what actually is it? And does it work?

A blend with Andean roots

Diabetisan isn't a single herb. It's a traditional herbal formula made up of several plants from the Andes and Amazon, each selected for its historical use in supporting blood sugar balance. The classic formula includes three main herbs:

Pasuchaca (Geranium dielsianum) is the backbone of most Diabetisan blends. It grows at high altitudes in the Andes and has been used by rural communities in Ayacucho and Cusco for generations. Research from Peru's Universidad Nacional Mayor de San Marcos found that pasuchaca extracts had measurable hypoglycemic effects in animal models. That's not a human clinical trial, but it explains why the plant keeps appearing in ethnobotanical literature on blood sugar management.

Yacon (Smallanthus sonchifolius) is better known as a sweetener — see our yacon syrup for the food version — but the leaf also has a tradition of use in Peru for blood sugar. The active compounds are fructooligosaccharides, a type of prebiotic fiber that's absorbed slowly and doesn't spike glucose the way regular sugar does.

Cuti Cuti (Adiantum species) is a small Andean fern that turns up in traditional Peruvian medicine. Research on this one is thinner than on pasuchaca, but herbalists in Lima markets have included it in blood sugar blends for decades. Its role is thought to be complementary — rounding out the formula rather than driving the main effect.

Exact ratios vary by brand and region. Some Diabetisan products also add cat's claw, horsetail, or other Andean herbs.

What does the research actually say?

We'll be upfront: the research on Diabetisan as a complete formula is limited. Most of the clinical work has been done on its individual ingredients — especially pasuchaca — not on the blend as a whole.

A 2004 study in the Journal of Ethnopharmacology found that pasuchaca extract significantly reduced blood glucose in diabetic rats. A small Peruvian human study later showed modest reductions in fasting blood sugar after 30 days of use, but the sample size was too small (16 participants) to draw firm conclusions. It's a signal, not a verdict.

Yacon is further along in the research pipeline. A 2009 randomized controlled trial published in Clinical Nutrition found that overweight women who took yacon syrup over 120 days had significant reductions in fasting glucose and insulin resistance. That used syrup from the root rather than the leaf, but it points in the right direction.

The honest verdict: these herbs show real promise in early research. But if you have Type 2 diabetes, please work with your doctor before relying on any herbal supplement as a primary treatment. Diabetisan is not a replacement for metformin or meaningful dietary changes.

How people in Peru actually use it

In Lima pharmacies and Andean health markets, Diabetisan is sold almost exclusively as a tea, and that's how most Peruvian families use it — as a daily ritual, often replacing or supplementing the morning drink. Andean traditions don't draw a hard line between food and medicine. A cup of herb tea that supports your health is normal; it doesn't need a clinical trial to justify it culturally.

A typical routine is one to two cups per day. Some people in rural areas drink it more aggressively during harvest season, when starchy and sweet foods dominate the diet. In Lima wellness circles, it's often combined with a low-glycemic diet and walking — not as a magic fix, but as a daily support habit.

How to brew it

If you're using tea bags, the method is simple. Bring 8–10 oz of water to a near-boil — around 90°C works well, not a rolling boil — and steep for 5–7 minutes. Longer steeping pulls more of the bitter compounds out; some people like that, others find it too intense. Start with five minutes and adjust. One bag per cup, one to two cups per day is a reasonable starting point.

Avoid adding sugar, for obvious reasons. A small amount of stevia is fine if you need a little sweetness.

Who might consider it

Diabetisan is most commonly used by people who have been diagnosed with prediabetes and want complementary herbal support alongside diet and exercise, those with a family history of diabetes who want a preventive daily ritual, or people already managing blood sugar who want something functional in their morning routine. It also works simply as a non-caffeinated herbal tea with a long cultural track record.

One caution worth mentioning: if you're on blood-sugar-lowering medications like metformin or insulin, there's a theoretical risk of additive hypoglycemic effects when combining them with herbs that also lower blood sugar. This isn't a reason to avoid Diabetisan, but it is a reason to mention it to your prescriber. Low blood sugar is just as problematic as high blood sugar.

A note on sourcing

Like most Peruvian herbal products, Diabetisan varies in quality depending on where you buy it. Some blends on the market list herbs without specifying quantities or origin. Our Diabetisan Herbal Tea is sourced through our Andean supplier network, which means we know the herbs are what the label says they are — a basic quality bar that isn't guaranteed everywhere.