How to Brew Yacon Leaf Tea: Peru's Other Yacon Product

July 12, 2026

Most people who know yacon know it as syrup, the thick, molasses-colored sweetener that's become popular as a lower-glycemic alternative to honey or maple syrup. Fewer people know that the yacon plant (Smallanthus sonchifolius) also produces leaves that get dried and brewed as tea, a completely separate product with a different, less-studied tradition behind it.

We carry both: Yacon Syrup, made from the tuber's juice, and Yacon Leaf Tea, made from the dried leaf. If you've only tried the syrup, the tea is worth understanding on its own terms rather than assuming it does the same thing.

Why Andean households drink the leaf, not just the root

Yacon itself has been cultivated in the Andes for at least 3,000 years, mostly for the crunchy, sweet tuber that tastes something like a cross between an apple and a water chestnut. The leaf tea is the quieter sibling in that tradition, not something you'll find marketed on Amazon best-seller lists the way yacon syrup is, but still something rural households in Cajamarca and the central highlands have brewed for as long as anyone can remember.

In the highlands of Peru where yacon is grown, farmers have used the leaf tea for generations, mostly for two things: as a mild digestive aid after heavy meals, and, more specifically, as something people with elevated blood sugar reach for between meals. The syrup gets attention today because of its fructooligosaccharide content, a type of fiber that feeds gut bacteria and doesn't spike blood sugar the way regular sugar does. The leaf works through a different set of compounds, mainly chlorogenic acid and related polyphenols concentrated in the leaf tissue rather than the root.

What the research says, and where it's thin

Here's the honest version: most of the research on yacon and blood sugar is about the root, specifically fructooligosaccharide content and a handful of small human trials on yacon syrup or flour showing modest improvements in fasting glucose and insulin resistance markers. The leaf tea has less behind it. Most of what exists is animal and lab research showing that yacon leaf extracts can lower blood glucose in diabetic rodent models, a real finding, but not the same as proof it works the same way in a person drinking a cup of tea.

We're not going to tell you yacon leaf tea treats diabetes, because it doesn't, and no herbal tea does. What we can say is that it's a traditional, low-risk addition to a routine that's already built around diet and, if needed, medication. Not a replacement for either.

How to brew it

Use about 1 teaspoon, roughly 2 grams, of dried yacon leaf per cup of water just off the boil. Steep for 8 to 10 minutes, longer than you'd steep a delicate green tea, since yacon leaf is sturdier and needs the extra time to release its flavor and compounds. Strain and drink it plain. It has a mild, slightly earthy, faintly sweet taste, nothing like the syrup's caramel flavor.

Most people who drink it regularly have one to two cups a day, often 20 to 30 minutes before a meal rather than with it. That timing isn't backed by a specific study we can point to. It's just the pattern that's carried forward through Andean tradition, and it's a reasonable enough approach if you want to try it.

An important caution

If you take insulin or a blood sugar medication like metformin or a sulfonylurea, talk to your doctor before adding yacon leaf tea to your routine. Combining a plant with even a mild blood-sugar-lowering effect with medication that does the same thing can push your levels lower than intended. This applies to the leaf tea and to yacon syrup both, though the syrup's effect on blood sugar is generally milder since you're using it as a sweetener replacement rather than drinking it as a concentrated tea.

Skip it if you're pregnant or breastfeeding, since there isn't enough safety data either way. And if you notice your fasting glucose readings dropping more than expected after adding it in, that's worth mentioning to whoever manages your care, not something to just monitor quietly on your own.

Which yacon product actually fits your goal

If you're mainly looking for a sugar substitute for coffee, baking, or oatmeal, the syrup is the more practical choice; it's designed for that. If you want something to sip between meals as part of a blood-sugar-conscious routine, the leaf tea fits better. And if you want a blend formulated specifically for blood sugar support with multiple herbs working together, our Diabetisan tea combines pasuchaca and cuti cuti with yacon, three Andean herbs traditionally used for this exact purpose. You can browse the full lineup in our blood sugar support collection.

None of these replace a doctor's guidance if you're managing diabetes or prediabetes. They're traditional tools that fit alongside that care, not around it.