What Is Cuti Cuti? Peru's Waterfall Fern for Diabetisan

If you've ever read the ingredient list on a bottle of Diabetisan and stopped at "Cuti Cuti," you're not alone. Pasuchaca gets most of the attention. It's the herb Peruvian pharmacies stock on its own, the one with an actual body of research behind it. Cuti Cuti just sits quietly in the blend, doing its job without a marketing budget.

So what actually is it?

Cuti Cuti is a wild fern that grows in the Peruvian Andes, usually tucked into rock crevices near waterfalls and streams, the kind of damp, shaded spot a fern needs to survive at altitude. It's not cultivated on farms the way maca or camu camu are. Most of what ends up in supplements is still hand-gathered from where it naturally grows, which is part of why you rarely see it sold as a standalone product. It's a supporting-cast herb, not a headliner.

In traditional Andean use, Cuti Cuti has one main job: blood sugar. Herbalists in Peru have long paired it with Pasuchaca specifically for this. The combination shows up again and again in folk remedies for diabetes, usually brewed as a tea or decoction and taken a few times a week rather than daily. Some traditional accounts also describe it being used more broadly for inflammation and pancreas support, the idea being that it helps the pancreas do its job rather than replacing insulin outright.

Here's the honest part: the research on Cuti Cuti by itself is thin. Pasuchaca (Geranium dielsianum) has real clinical and lab studies behind it, including work on its glucose-lowering and antiglycation activity. Cuti Cuti hasn't gotten the same attention from researchers. What exists is mostly traditional-use documentation and ethnobotanical surveys of Andean markets, not clinical trials. That's not unusual for a plant this obscure outside its home region, but it means you should treat claims about Cuti Cuti the way you'd treat any unstudied folk remedy: plausible, rooted in generations of use, but not proven the way a pharmaceutical is proven.

Lima's herb markets are notorious for making this kind of thing harder to sort out. A study on plants sold as anti-diabetics in Lima markets found that vendors often mislabel species, several different plants get sold under overlapping common names, and buyers frequently can't verify what they're actually getting. That's one more reason a sourced, labeled product beats a mystery bundle from a market stall: you at least know what's inside.

That's exactly why Cuti Cuti is formulated into Diabetisan alongside Pasuchaca and Yacon rather than sold on its own. Yacon brings fiber and a mild prebiotic effect, Pasuchaca brings the closest thing to clinical backing, and Cuti Cuti adds the traditional pancreas-support angle Andean herbalists have leaned on for generations. Together they're meant to work as a blend, the same way a Peruvian abuela wouldn't hand you just one ingredient. She'd hand you the whole pot.

A quick note on what Cuti Cuti is not: it's not a fast fix, and it's not a substitute for whatever your doctor has you on for blood sugar management. If you have diagnosed diabetes, adding an herbal capsule isn't a reason to skip metformin or insulin. Think of it as something that runs alongside a real treatment plan, not instead of one, and loop your doctor in before adding it, especially if you're already on medication that affects blood sugar.

Who should be cautious: pregnant or nursing women should skip it, there's no safety data either way. The same goes if you're on other diabetes medications, since stacking blood-sugar-lowering effects can push levels lower than you want. And if you notice symptoms of low blood sugar, shakiness, sweating, confusion, stop and check in with a doctor rather than pushing through.

If you're curious about trying the blend, Diabetisan Herbal Capsules combine Cuti Cuti with Pasuchaca and Yacon in a single vegan capsule, a simpler starting point than trying to source Cuti Cuti on its own (most people outside Peru won't find it any other way). If you'd rather sip than swallow, our Diabetisan Herbal Tea uses a similar traditional blend in loose tea form, and you can browse the full lineup in our blood sugar support collection.

Peru has been leaning on plants like this for centuries, mostly because the ones that stuck around are the ones that actually did something. Cuti Cuti's obscurity outside the Andes says more about how few people have studied it than about whether it works. That's worth knowing whether or not you ever try it.

*These statements have not been evaluated by the FDA. Diabetisan is not intended to diagnose, treat, cure, or prevent any disease.