Specialized Research

Follistatin-315

Also known as: FS-315, FST-315

Overview

315-amino acid isoform of follistatin with preferential selectivity for myostatin over activin. Considered more specific for muscle growth with less impact on the reproductive and endocrine axes.

Protein of 315 amino acids. Shorter isoform of Follistatin-344.

Molecular Weight

~35 kDa

Half-life

~4-8 hours

Administration Route

Subcutaneous

Category

Specialized Research

Mechanism of Action

  • Selective myostatin inhibition
  • Lower affinity for activin compared to FS-344
  • Promotion of muscle hypertrophy
  • Less interference with the reproductive hormonal axis

Dosage Protocol

Data compiled from the literature. This does not constitute medical advice.

Parameter Value
Dose 100-200 mcg per injection
Frequency Once daily
Timing Morning or post-workout
Duration 10-30 days

Reported Side Effects

Adverse effects described in the literature. Severity and frequency vary between individuals.

  • Injection site redness
  • Fatigue
  • Headache

Presentations & Preparation

Vials of Follistatin-315 found in the research market:

1 mg

Reconstitution

  • Diluent: Bacteriostatic water
  • Volume: 1 ml per 1 mg vial
  • Inject diluent slowly
  • Gently swirl
  • Immediate use recommended

Storage

  • Lyophilized: Frozen -20°C (long-term)
  • Reconstituted: Refrigerated 2-8°C (up to 7 days)
  • Avoid freeze/thaw cycles
  • Protect from light
Reconstitution Calculator

Related Peptides

Aviptadil

50-150 mcg per administration (IV or subcutaneous) · 1-3 times daily per protocol

B7-33

100-500 mcg per injection (subcutaneous) · Once daily

Bronchogen

5-10 mg per day via subcutaneous injection · Once daily

Cardiogen

5-10 mg per day subcutaneously · Once daily

Chonluten

5-10 mg per day subcutaneously · Once daily

Crystagen

5-10 mg per day via subcutaneous injection · Once daily