Peptides & Research Chemicals
Follistatin-344 (Myostatin Inhibitor)
Street names: follistatin, follistatin-344, FST344, myostatin inhibitor
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- Blocks myostatin — the protein that limits muscle growth (in theory)
- Muscle-gain claims based on animal data
- Marketed for hard-gainer and bodybuilding use
⚠Key risks
- No completed human trials for muscle building — doses are guesswork
- Myostatin inhibition may affect heart muscle
- Tendons may not keep pace with muscle growth, raising rupture risk
- Grey-market purity unknown
- Banned by WADA
✚Overdose signs
- No established profile; injection-site reactions and water retention reported anecdotally
Category comparison — Peptides & Research Chemicals
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| Follistatin-344 (Myostatin Inhibitor) | Unapproved; banned in sport | No completed human trials for muscle building — doses are guesswork; Myostatin inhibition may affect heart muscle | €80-200 per cycle from grey-market peptide vendors. |
| BPC-157 | Unscheduled — 'research chemical', not approved for human use anywhere | ZERO human clinical trials — all human use is anecdotal self-experimentation; Unregulated synthesis: purity, sterility, and actual content unverified | ~$20–$60 per 5 mg vial grey-market |
| TB-500 (Thymosin Beta-4 fragment) | Unscheduled — 'research chemical'; banned in sport | No approved human use or trials — same self-experimentation class as BPC-157; Growth/repair factor activity raises theoretical cancer concerns | ~$25–$70 per vial grey-market |
| Melanotan II | Unscheduled | Unapproved — regulators (FDA/TGA/MHRA) have issued warnings and seizures; 'Melanotan rage' — documented mood/aggression changes | ~$20–$50 per 10 mg vial grey-market |
| GHRPs & GH Secretagogues | Unscheduled — 'research chemicals' | All are 'research chemical' grade unless pharmacy-sourced: purity unknown; Water retention, carpal-tunnel symptoms, insulin resistance with chronic use | ~$15–$40 per vial grey-market |
| IGF-1 & MGF analogues | Unscheduled — 'research chemicals'; IGF-1 is Rx | Hypoglycemia — IGF-1 pulls blood sugar down hard; dangerous in diabetics; Theoretical but serious cancer concerns — IGF-1 feeds tumor growth | ~$30–$80 per vial grey-market |
Street prices are regional estimates. Potency and cuts vary constantly.
?Frequently asked questions
What does Follistatin-344 (Myostatin Inhibitor) look like?
Research peptide sold as powder in vials for injection; marketed to bodybuilders as a myostatin blocker.
What are the signs of a Follistatin-344 (Myostatin Inhibitor) overdose?
No established profile; injection-site reactions and water retention reported anecdotally Call emergency services immediately.
How addictive is it?
No completed human trials for muscle building — doses are guesswork Dependence can develop with regular use.