Goals
Each goal starts with legal options, then shows what studies found for specific substances.
- Muscle massStudies usually measure body mass without fat, which is not the same as working muscle. Most studies of these substances involved older or ill people.
- StrengthStrength depends on the nervous system and technique as well as muscle size, so more mass does not always mean more strength.
- Recovery and injuryHealing in rats and mice does not reliably predict how human tendons and muscles heal. An unexplained injury should be checked by a doctor first.
- Longer lifeNo substance on this site has been shown to extend human life. Studies in people measure short-term signs, such as blood results.
- Fat lossApproved obesity medicines exist, prescribed by a doctor. Versions sold online are a different product with unknown contents.