Vergelijking
Follistatin (FST) vs. Ipamorelin
Twee peptiden naast elkaar — identiteit, bewijsbasis, juridische status en bekende bijwerkingen.
Identiteit
Categorie
Groei
Groei
CAS-nr.
122956-17-2
170851-70-4
Molecuulmassa
35000 g/mol
711.86 g/mol
Halfwaardetijd
geen gegevens
2 h
Sequentie
Glykoprotein, ~315 Aminosäuren in der zirkulierenden Hauptform (Sequenz isoformabhängig, kein einheitliches kurzes Peptid)Aib-His-D-2-Nal-D-Phe-Lys-NH2Werkingsmechanisme
Follistatin (FST)
Follistatin binds with high affinity to activin and to myostatin (GDF-8), as well as related TGF-β ligands such as GDF-11 and some BMPs, preventing their binding to the activin type-II receptors. Myostatin is a negative regulator of skeletal muscle mass; by sequestering myostatin, its growth-inhibiting signalling is removed (de-repression). Because follistatin additionally neutralises activin, it acts on several muscle-inhibiting pathways at once — in animal models this produced greater muscle gain than knocking out myostatin alone. Several isoforms exist (including FST-288 and FST-315) that differ in tissue binding via heparan sulfate. The FST344 variant used in gene therapy was chosen to reduce binding to off-target structures.
Ipamorelin
Ipamorelin is a selective agonist at the GH secretagogue receptor (GHSR-1a). Compared to GHRP-2 and GHRP-6 its selectivity for the growth-hormone axis is higher; ACTH, cortisol and prolactin are not significantly stimulated in clinical studies. This selectivity was the main reason for its development over older GHRPs.
Bewijsbasis
Hoogste bewijs
Humane studie
Humane RCT
Studies
4
4
waarvan bij mensen
1
3
Geregistreerde effecten
4
3
Openstaande tegenstrijdigheden
1
1
Gedocumenteerde bijwerkingen
1
1
Juridische status
Volledige vermeldingen
Frequently asked questions
- What is the difference between Follistatin (FST) and Ipamorelin?
- Follistatin (FST) is classified as "Groei", while Ipamorelin is classified as "Groei". Follistatin (FST): Follistatin is an endogenous glycosylated binding protein (~35 kDa, considerably larger than typical peptides) that binds and neutralises members of the TGF-β superfamily, including activin and myostatin (GDF-8). In animal models, raising follistatin de-represses muscle growth. Clinically it has been studied mainly via AAV gene therapy (FS344) in muscular dystrophies. Follistatin is not an approved drug; human efficacy and safety data are limited and stem mostly from early gene-therapy trials and preclinical research. A 'follistatin-344' product is sold on the grey market, the identity and purity of which cannot be verified without analytics. Ipamorelin: Synthetic pentapeptide and selective growth-hormone secretagogue. Developed at Novo Nordisk in the 1990s as a pentapeptide GHRP successor; clinical development was discontinued after phase 2 (post-operative ileus). This page contrasts both neutrally and source-based — with no usage or dosing recommendation.
- Which peptide is better supported by science, Follistatin (FST) or Ipamorelin?
- The highest available evidence level is "Humane studie" for Follistatin (FST) and "Humane RCT" for Ipamorelin. A higher evidence level means more robust data, but says nothing about suitability for an individual. The full body of evidence is on each peptide's own page.
- What is the legal status of Follistatin (FST) and Ipamorelin in Germany and the United States?
- Duitsland: Follistatin (FST) — Niet goedgekeurd, Ipamorelin — Niet goedgekeurd. Verenigde Staten: Follistatin (FST) — Niet goedgekeurd, Ipamorelin — Niet goedgekeurd. These are factual summaries with source and review date on the individual pages.