LeanBiome Review 2026

LeanBiome is a dietary supplement from Lean for Good® built on a simple idea from Ivy League research: people who stay naturally lean tend to have a ‘naturally lean’ gut microbiome, rich in ‘lean bacteria’ species that help suppress hunger, dampen cravings, fire up the metabolism and reduce fat storage.

Biome® combines nine clinically-researched ‘lean bacteria’ species with Greenselect Phytosome®, a caffeine-free green tea extract made with patented absorption-boosting Phytosome technology. The capsules are DRcaps — delayed-release capsules with an acid-resistant coating, so the live bacteria survive stomach acid and reach your gut.

A study at King’s College London looked at 3,600 sets of twins — one lean, one overweight — and found the lean twins had a rich, diverse gut microbiome packed with ‘lean bacteria’, while the overweight twins’ microbiomes were dominated by ‘fat bacteria’ that ramped up hunger, fuelled cravings, froze the metabolism and increased fat storage.

The vendor cites clinical research on its key ingredients: Lactobacillus Gasseri (8.5% belly fat lost in a 12-week trial), Lactobacillus Rhamnosus (9.7 lbs of fat lost in 12 weeks — twice the placebo group), Lactobacillus Fermentum (a 3% drop in body fat in 43 days) and Greenselect Phytosome® (30 lbs lost in 90 days, vs 11 lbs for diet alone).