White kidney bean extract

Tier 3 — weak evidence · Weight management · Starch blocker · Blood sugar

Contains alpha-amylase inhibitor phaseolamin, which partially blocks dietary starch digestion. Meta-analyses of RCTs show modest weight loss (1–2 kg over 4–12 weeks) and blunted post-meal glucose spikes when taken before starchy meals. Effect is dose-dependent and highly variable across products due to standardisation differences. No effect on fat or protein digestion. A mechanistically credible carbohydrate management adjunct — not a substitute for dietary changes.

Dose: 500–1,500 mg standardised extract taken 5–15 minutes before carbohydrate-containing meals