Ursolic acid (from apple peels, holy basil, rosemary) is a pentacyclic triterpenoid that increases muscle mass while decreasing fat mass, a 'recomposition' compound.
In 2012, University of Iowa researchers showed ursolic acid activates Akt/mTOR (muscle growth) while simultaneously activating brown fat thermogenesis.
Animal data is strong: reduced obesity, increased muscle, improved insulin sensitivity. Human clinical trials are just beginning.
Found in apple peels (80mg per apple), rosemary, and tulsi. Supplemental dose: 150-450mg/day. The 'eat the apple peel' advice is literally evidence-based.
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*Reviewed by the Avelor Research Team and Clinical Advisory Board*
*Last updated: 2026-04-06*