(-)-Epicatechin
Dark chocolate flavonoid that inhibits myostatin and boosts follistatin, supporting muscle growth, endurance, and cardiovascular health.
(-)-Epicatechin is a flavonoid abundant in dark chocolate, cocoa, and green tea. It's gained attention for its potential to enhance muscle growth by inhibiting myostatin (a protein that limits muscle growth) and increasing follistatin. It also supports cardiovascular health through nitric oxide enhancement and improved endothelial function. The muscle-building effects are of particular interest to athletes seeking natural performance enhancement.
Reduces myostatin, a muscle growth limiter
Improves blood vessel function
Increases mitochondria in muscles
How Epicatechin works â from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta â pathways are being refined and expanded.
100-200mg daily
Loading: Not established
Take with food
| Form | Type |
|---|---|
| ðPure (-)-Epicatechin extract | Recommended |
| ðHigh-epicatechin cocoa extract | Alternative |
| ðDark chocolate (food source) | Alternative |
Isolated epicatechin allows precise dosing. Dark chocolate contains ~50mg per 50g but also has calories/sugar.
Minimum: 4 weeks
Optimal: 8 weeks
Cycling: 8 weeks on, 4 weeks off; or continuous for cardiovascular benefits
Note: Taking with fat may improve absorption. Can be taken before workouts for potential NO benefits.
Potential enhancement of muscle growth and strength
Improved blood flow and endothelial function
Enhanced exercise capacity
Most muscle studies are preclinical
Promising for muscle and endurance; more research needed
Theoretical interaction due to NO effects â may affect platelet aggregation or vitamin K-dependent clotting factors, altering anticoagulant efficacy
Tip: Take with food
Tip: Reduce dose
Top studies from 39+ peer-reviewed papers
Jin H et al. ⢠The Cochrane database of systematic reviews (2012)
âThere is insufficient and conflicting evidence regarding flavonoid intake and the prevention of colorectal neoplasms.â
Hooper L et al. ⢠The American journal of clinical nutrition (2012)
âWe found consistent acute and chronic benefits of chocolate or cocoa on FMD and previously unreported promising effects on insulin and HOMA-IR.â
Lagou V et al. ⢠European journal of preventive cardiology (2025)
âFlavan-3-ol-rich foods considerably reduce elevated BP and improve endothelial function independent of blood pressure supporting their use for cardiovascular prevention.â
Li Y et al. ⢠Critical reviews in food science and nutrition (2025)
âFurther research is needed to enhance biomarker validity for precise dietary intake assessment in epidemiological studies.â
Christen WG et al. ⢠JAMA ophthalmology (2025)
âIn this ancillary study of the COSMOS randomized clinical trial, cocoa extract supplementation for a median period of 3.6 years among older women and men had no effect overall on occurrence of AMD.â
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