Uluhal (Trigonella foenum-graecum): Fenugreek for Blood Sugar — and the Breast Milk Question

Uluhal (Trigonella foenum-graecum) is the small, amber, maple-scented seed that goes into the tempering oil of every Sri Lankan dhal and into the toddy-and-fenugreek porridge given to new mothers. Two traditional claims follow it everywhere: that it lowers blood sugar, and that it brings in breast milk. By 2024 the trials had given clear, and different, answers to each.

Botanical and Cultural Background

Fenugreek is an annual legume, an upright clover-like plant whose slender pods hold ten to twenty hard, angular seeds. Native to the Mediterranean and western Asia, it reached South Asia thousands of years ago and is now grown across India; Sri Lanka imports most of its seed. The distinctive smell comes from sotolon, the same compound that scents maple syrup, and it famously turns up in the sweat of anyone taking large doses. The seeds are rich in a soluble fibre (galactomannan) and in saponins that underlie most of the plant's effects.

Traditional Uses in Sri Lankan Medicine

• Diabetes — seeds soaked overnight and eaten in the morning, or seed powder with warm water before meals.
• New mothers — uluhal kanda (porridge) or seeds in the postpartum diet to promote milk and recovery.
• Digestion — tempered seeds in dhal and vegetable curries; a soaked-seed drink for acidity.
• Hair and skin — a seed paste as a hair mask against dandruff and hair fall.

What the Research Shows

For blood sugar, the evidence is now solid. A 2023 meta-analysis in the International Journal of Molecular Sciences covering randomised trials in type 2 diabetes and prediabetes found fenugreek significantly lowered fasting glucose, post-meal glucose and HbA1c, and a 2024 meta-analysis in Heliyon confirmed reductions in fasting glucose, HbA1c and insulin resistance, along with lower LDL and higher HDL cholesterol. The mechanism is largely the fibre slowing carbohydrate absorption, plus an amino acid (4-hydroxyisoleucine) that stimulates insulin release.

For breast milk, the picture is weaker than the folklore. A network meta-analysis found fenugreek produced a modest increase in milk volume compared with placebo but performed worse than some other galactagogues (Khan et al., 2018), and the LactMed database notes that the better-designed trials show little or no effect. Some mothers clearly benefit; the average effect is small.

Evidence updated September 2026.

How Uluhal Is Prepared

For blood sugar, the studied preparations use 5–10 g of seed daily (roughly a tablespoon), either soaked overnight in water and chewed in the morning or ground and taken with warm water before the two main meals. Uluhal kanda is made by simmering rice or rice flour with soaked seeds and coconut milk. In cooking, temper a quarter-teaspoon of seeds in hot oil until they darken — over-toasting turns them bitter.

Safety and Precautions

Fenugreek adds to glucose-lowering medicines: diabetics should monitor and inform their doctor. Medicinal doses are traditionally avoided in pregnancy because the seeds can stimulate the uterus. It can interact with blood thinners, and people allergic to peanuts or chickpeas may react to it. Expect a maple smell in sweat and urine at higher doses; in breastfed babies this is harmless but can be mistaken for a metabolic disorder — mention fenugreek use to your paediatrician.