The science, sorted by what it’s for.

Tendon, ligament, muscle and gut repair — the most-hyped corner, and the most animal-data-heavy.

Weight, blood sugar and mitochondrial function — home to the one item here with strong human evidence.

The growth-hormone axis — secretagogues and releasing hormones, and the gap between raising a hormone and a real benefit.

Focus, memory and mood — largely Russian clinical history, thin Western replication.

Topical actives with genuine cosmetic science, kept carefully separate from injectable claims.

Ageing and healthspan candidates — intriguing biology, mostly preclinical.

Desire and arousal pathways — where a licensed medicine and a research chemical share a name.

TRT and hormone management — genuine prescription medicines, but self-managing them outside a monitored programme carries real risk.