Follistatin-315
FST-315
Muscle & Growth2 vendors · 2 listings
Size
All 1mg prices shown
Follistatin-315 Prices
Also known as FST-315
2 listings from 2 vendors, normalised to one honest price per milligram.
Cheapest per mg
$99.99/mg
At
Umbrella Labs
Vendors
2
Sizes
1mg
Follistatin-315 price per mg by vendor
Prices last collected October 3, 2026. Prices change often - check the vendor's site before ordering.
Choose a size to compare vendor prices.
Mixing Follistatin-315
What each amount of water produces at this vial size. Educational reference, not a recommendation.
1 mL1.00 mg/mL100 mcg = 10 units
2 mL500.0 mcg/mL100 mcg = 20 units
3 mL333.3 mcg/mL100 mcg = 30 units
Reference sources mix this one with dilute acetic acid, not bacteriostatic water. Check the volume against your own source.
Vial sizes are the ones vendors list for Follistatin-315. Syringe marks assume a 100 mcg dose on a U-100 syringe, taken from this compound's reference range. Work out any other combination in the reconstitution calculator.
About Follistatin-315
- What it is
- Follistatin-315 is the mature follistatin protein and the main isoform circulating in blood. An acidic tail lowers its binding to cell-surface heparan sulfate, so it stays soluble rather than tissue-bound like the shorter form. It binds and neutralizes activin and myostatin, and blocking myostatin is the basis of research interest in muscle. It is the same mature protein encoded by the follistatin-344 transcript and has not been approved for any use.
- How it works
- As the main circulating follistatin form, it binds activin and myostatin in blood, preventing them from activating muscle-limiting receptors.
- Researched for
- Myostatin inhibition; activin binding; muscle growth research; circulating follistatin studies
- Half-life
- Not established in humans
- Familiarity
- Advanced
- Research evidence
- Human trials - early or small
- Regulatory status
- Investigational
- Key risk
- No serious risk is documented in the limited human data, though unregulated inhibition of activin and myostatin signaling is a theoretical concern.
Disclosure. Some vendors above are Peptul partners and pay us a commission when you buy through our link. Rows are ordered by: Peptul partners first, then what is in stock, then single vials before multi-vial packs, then price per milligram. Paying us moves a vendor up this order and changes nothing else - not their trust tier, COA badge, Peptul Score or reviews, which come from evidence and are worked out the same way for everyone. Available discount codes are shown beside the prices above. Discounted prices require the displayed code where indicated.
For educational and research purposes only. Not medical advice. Always consult a qualified healthcare provider before using any research compound.