Supplement analysis backed by scientific evidence · PT · ES · DE · FR

← All supplements
Limited evidenceHeart & metabolic

Pata de Vaca

Marketed as 'vegetable insulin,' Bauhinia forficata has one clearly negative trial of the traditional tea and one positive trial of a standardized 300 mg extract. The form matters enormously, and neither result is strong enough to change diabetes management.

View on iHerb Ships to 180+ countries · welcome discount for new customers

What the science says

  • Lowers blood glucose and HbA1c Limited evidence

    The two trials disagree, and the difference is the preparation. A 1990 randomized double-blind crossover in 16 type 2 diabetics and 10 healthy subjects gave an infusion of 3 g of leaves per day for 56 days and found no acute or chronic effect on plasma glucose or glycated hemoglobin — the authors concluded flatly that the infusion has no hypoglycemic effect. A 2022 trial randomized 92 type 2 diabetics to 300 mg of a standardized leaf extract (2% total flavonoids) or placebo alongside their usual oral antidiabetics for 4 months and found significantly lower fasting glucose and HbA1c in the extract group.

  • Improves cholesterol and triglycerides Limited evidence

    A 25-patient quasi-experimental study with no control group had type 2 diabetics drink 0.4% B. forficata tea in 200 mL twice daily for 3 months, reporting drops of 48 mg/dL in triglycerides and 17 mg/dL in total cholesterol. With no randomization, no blinding, and no comparison group, these numbers cannot be separated from the effects of study participation and dietary change.

  • Acts like insulin ('insulina vegetal') Limited evidence

    The nickname is folk branding, not pharmacology. Bauhinia flavonoids such as kaempferitrin have shown glucose-uptake and alpha-amylase-inhibiting activity in cell and docking studies, which is a very different mechanism from insulin. Nothing in the plant substitutes for insulin, and treating it as if it does is dangerous for anyone with type 1 diabetes.

Dosage & safety

Studied doseThe positive trial used 300 mg per day of a standardized dry leaf extract yielding 2% total flavonoids, for 4 months, as an add-on to existing medication. The negative trial used an infusion of 3 g of dried leaves per day for 56 days. If you use it at all, the standardized extract is the only form with supporting data; loose leaf tea has been directly tested and failed.
SafetyNo serious adverse effects were reported in either randomized trial. The realistic risk is additive hypoglycemia when combined with metformin, sulfonylureas, or insulin — monitor glucose if you add it, and never reduce prescribed medication on the strength of a supplement. There is no reproductive safety data, so avoid in pregnancy and breastfeeding, and no long-term data beyond 4 months. Bauhinia is a large genus with many species sold under the same 'cow's hoof' common name, so species verification on the label matters.

How to take it

TimingTiming does not matter.
With food?Either way.
Worth knowingBauhinia is a large genus and many species are sold as "cow's hoof" — the label needs to name the species.

Interactions

With medications

  • metformin, sulfonylureas and insulin

    Additive blood-glucose lowering — the trial that worked used it as an add-on to existing medication. monitor glucose and adjust doses only with your prescriber

With other supplements

  • other glucose-lowering supplements (berberine, banaba, salacia)

    Additive hypoglycemia risk. use one at a time

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does pata de vaca lower blood sugar?

The evidence for pata de vaca (Bauhinia forficata) is limited and depends on the form: an infusion of 3 g of leaves a day for 56 days had no effect on glucose or HbA1c, while a 300 mg standardised extract added to usual medication for 4 months lowered fasting glucose and HbA1c in 92 people with type 2 diabetes. Neither result is strong enough to change diabetes management.

Is pata de vaca really vegetable insulin?

No: the "vegetable insulin" nickname for pata de vaca is folk branding, not pharmacology, since its flavonoids act on glucose uptake and alpha-amylase rather than like insulin. Nothing in the plant substitutes for insulin, and treating it as if it does is dangerous for anyone with type 1 diabetes.

How much pata de vaca should I take?

The only positive trial of pata de vaca used 300 mg a day of a standardised leaf extract with 2% total flavonoids, for 4 months, as an add-on to existing medication. Loose-leaf tea has been directly tested and failed, and the label should name the Bauhinia species.

Can I take pata de vaca with metformin or insulin?

Pata de vaca adds to the glucose-lowering effect of metformin, sulfonylureas and insulin, so monitor your glucose and adjust doses only with your prescriber. Avoid stacking it with other glucose-lowering supplements such as berberine, banaba or salacia.

Scientific references

Where to buy

View on iHerb

Ships to 180+ countries · welcome discount for new customers

Referral link — this site may earn a commission on purchases.

Related in Heart & metabolic