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Herb and medicine interaction

Fenugreek (methi) with metformin or insulin

Fenugreek (methi) (Trigonella foenum-graecum) with metformin and insulin.

Evidence of interactionPending medical review

The short answer

Possibly, by adding to the fall in blood sugar. In a 12-week placebo-controlled trial, a patented fenugreek (methi) seed extract taken with metformin, or metformin plus a sulfonylurea, lowered fasting sugar, sugar after meals and HbA1c. In a six-month trial, people on diabetes tablets or insulin who ate soaked methi seeds daily had lower fasting sugar and HbA1c.

Neither trial counted low-sugar episodes well enough to say how often they happen. The US agency NCCIH warns that large doses of fenugreek may cause a harmful drop in blood sugar. If you take metformin or insulin and use methi as a remedy, tell your prescribing doctor, and ask how often to check your sugar.

Metformin is sold in India as Glycomet. Insulins include Actrapid, Lantus and NovoRapid.

At a glance

What was seenHow it may workDirectionEvidence
Lower fasting sugar, post-meal sugar and HbA1c with a patented seed extract added to metformin or metformin plus a sulfonylurea[1]Added sugar loweringMore sugar lowering on top of diabetes medicineRCT
Lower fasting sugar and HbA1c with daily soaked seeds, alongside tablets or insulin[2][3]Added sugar loweringAdds to diabetes medicines; low-sugar risk not measuredRCT

No listing is not a clearance. A missing interaction here never means a combination is safe.

The evidence, study by study

Placebo-controlled trial in type 2 diabetes, 2024 RCT

Adults taking metformin, or metformin with a sulfonylurea, were given a patented fenugreek seed extract (Fenfuro, 500 mg twice a day) or placebo for 12 weeks. In the extract group, fasting sugar fell 38%, post-meal sugar 44%, and HbA1c by 34.7% of its starting value, which is not the same as 34.7 percentage points. No side effects were reported. Only 81 of the 104 people enrolled were analysed, the extract was developed by some of the authors, and low-sugar episodes were not clearly tracked.[1]

Randomised trial with soaked seeds, 2017 RCT

Sixty adults with type 2 diabetes, on tablets or insulin with diet and exercise advice, were split into two groups of 30. One group added 10 g of methi seeds soaked in hot water every day for six months. In that group, fasting sugar was significantly lower by month five and HbA1c by month six. The summary does not make clear whether this was compared with the other group, and it gives no results by medicine and no count of low-sugar episodes.[2]

What your doctor may watch for

  • Blood sugar readings, and any episode of low sugar, especially if you use insulin.[3]
  • HbA1c at your regular diabetes review.[1]

What to tell your prescribing doctor

You can read this out, or show them this page:

“I take metformin or insulin (name and dose), and I am taking, or planning to take, methi (seeds, soaked water, powder or capsules, and how much). Trials found methi can lower blood sugar further on top of diabetes medicine. How often should I check my sugar, and what reading should make me call you?”

Withheld until review

Dose adjustments and any “no known interaction” clearance appear only after a vaidya on our medical board has reviewed this page. Why we hold these back

Questions people ask

Is methi in my food the same as taking it as a remedy?

The trials tested a daily serving of soaked seeds and a concentrated extract, not methi as it is used in everyday cooking. Nobody has measured the effect of cooking amounts alongside diabetes medicines.[2][1]

Would taking methi at a different time from metformin help?

No study has tested a time gap. Both trials measured methi's effect on blood sugar over weeks and months, not a change in the drug itself, so ask your doctor rather than relying on timing.[1][2]

Related

Interaction

Fenugreek (methi) and warfarin

One reported case of a raised INR on warfarin with methi and another herb, boldo. Warfarin leaves little margin for change.

Condition

Type 2 diabetes (sugar): what Ayurveda offers

Some herbs, such as methi and karela, lowered HbA1c a little in trials. Taken with diabetes medicines, they can add to the risk of low sugar.

Interaction

Karela (bitter gourd) and diabetes medicines

Added to metformin and dapagliflozin, a karela extract lowered HbA1c further in a 2026 study. With insulin or sulfonylureas, low sugar is the worry.

Interaction

Ginger (adrak) and diabetes medicines

Ginger may add to the sugar-lowering effect of diabetes medicines. One small trial found lower sugar with ginger; a larger one found no clear difference.

Sources

  1. Gupta RS, Grover AS, Kumar P, Goel A, Banik SP, Chakraborty S, Rungta M, Bagchi M, Pal P, Bagchi D. A randomized double blind placebo controlled trial to assess the safety and efficacy of a patented fenugreek (Trigonella foenum-graecum) seed extract in Type 2 diabetics. Food Nutr Res. 2024;68. PMID 38863744.
  2. Ranade M, Mudgalkar N. A simple dietary addition of fenugreek seed leads to the reduction in blood glucose levels: a parallel group, randomized single-blind trial. Ayu. 2017;38(1-2):24-27. PMID 29861588.
  3. NCCIH (US National Center for Complementary and Integrative Health). Fenugreek: Usefulness and Safety.

Awaiting review by The Good Vaidya Medical Board. Prepared from the sources below and checked against each one.

Published 4 November 2026 · Last updated 4 November 2026

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