Follistatin-315
315-Aa variant.
- Sizes available
- —
- Lab certificate (COA)
- Arrives with shipment
· Research-grade only · Not for human consumption · 21+ ·
Circulating follistatin isoform. Inhibits myostatin with a longer serum half-life.
Mechanism · Follistatin 315-aa serum isoform. Alternate binding profile vs 344.
Best for. Not for.
Best for
- Sustained myostatin blockade (serum-isoform half-life).
- Users on a short (10-day) cycle.
Not for
- Concern for cardiac muscle hypertrophy.
- Active malignancy, pregnancy, or children.
- Long-term continuous use.
Mechanism, dose, ramp, risk.
- Mechanism
- Alternate isoform of follistatin. Different binding profile.Source · PEPVERA editorial
- Target dose
- 100 mcg / day.Source · PEPVERA editorial
- Ramp
- 10-Day cycles.Source · PEPVERA editorial
- Risks
- Same as 344.Source · PEPVERA editorial
Compared to its siblings.
Follistatin-315
Circulating follistatin isoform. Inhibits myostatin with a longer serum half-life.
Pros
- · Longer serum half-life than Follistatin-344.
- · Sustained myostatin blockade versus Follistatin-344's site action.
Cons
- · Less site-targeted than Follistatin-344.
- · Cardiac muscle hypertrophy concern shared with Follistatin-344.
Follistatin-344
Tissue-binding isoform. Local action.
Pros
- · Site-targeted
Cons
- · Shorter serum half-life
See Follistatin-344 →
COA per supplier
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Each supplier declares its own HPLC floor and COA policy. The per-supplier verifier appears on the certificate page; refund and shipping terms vary by supplier and are shown on the supplier listing.
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Direct from foundry. Slower than domestic resellers; consistency is the trade. Insulated packaging, tracked from departure to doorstep. Replacement issued on damage.
Risk
Same as 344. These pass with discipline. They do not pass with bravado.
Source · PEPVERA editorialDiscipline
10-Day cycles.
Source · PEPVERA editorialWellness
Hydrate. Eat protein. Sleep eight. Hold a dose for at least two weeks before ascending.
Anti-patterns
- · Do not pair with stimulants late in the day.
- · Do not break the cycle without a planned taper.
- · Do not exceed the dose to chase a deeper sleep response.
Crisis
If the ramp triggers severe anxiety, anhedonia, or persistent gastrointestinal disturbance, stop. Resume after two weeks at half the prior dose. The discipline is the slow climb.
Week 1–2
100 mcg / day.
Initiation
Week 3–4
100 mcg / day.
Signal emerges
Week 5–8
100 mcg / day.
Hold
Week 9–12
Cycle review
Assess
Draw 20 units.
0.1 mg = 0.20 mL at 0.50 mg/mL. 10.0 doses per vial.
apex · XII
Follistatin-315 · 1mg