Follistatin (FLGR242) (10mg) Follistatin, often referenced in research contexts as FLGR242 (a specific recombinant variant like Follistatin-344 or a pegylated/AA form), is a naturally occurring glycoprotein that acts as a potent myostatin inhibitor. Myostatin is a protein that limits muscle growth, so follistatin promotes hypertrophy (muscle growth) by binding and neutralizing it. It’s popular in bodybuilding and anti-aging research for its potential to enhance lean mass, strength, and recovery. The “10mg” refers to a common lyophilized vial size for reconstitution. Key Properties & Mechanism Molecular Target: Inhibits myostatin (GDF-8) and other TGF-β family members (e.g., activin), unlocking satellite cell proliferation and muscle fiber hyperplasia. Half-Life: Native form ~2-4 hours; pegylated/FLGR242 variants extend to 24-48 hours for less frequent dosing. Purity/Origin: Typically produced via E. coli or yeast (FLGR242 is often a 315-amino-acid construct with high bioactivity >95%). Evidence: Studies (e.g., PNAS 2007, Lee et al.): Follistatin (FLGR242) (10mg) overexpression in mice increased muscle mass by 2-3x without steroids. Human trials limited (phase I/II for neuromuscular diseases like Becker MD), but rodent/primate data shows 20-50% lean mass gains in 4-12 weeks (JCI 2010). Anecdotal: Bodybuilders report 5-15lbs lean gains/cycle, synergizes with SARMs/IGF-1. Reconstitution & Dosing Protocol (Research Use) Supplies Needed: Item Amount Notes Bacteriostatic Water (BAC) 2-5mL Preferred over sterile water for multi-dose. Insulin Syringe 1mL (30-31G) For subQ/IM injection. Alcohol Swabs Sterility. Reconstitution (10mg vial): Add 2mL BAC → 5mg/mL (500mcg per 0.1mL). Gently swirl (no shake) until clear. Store refrigerated (stable 4°C for 30 days; freeze aliquots -20°C for 6 months). Standard Research Dosing (not medical advice; experimental): Goal Dose Frequency Duration Total Cycle Muscle Hypertrophy 100-200mcg Daily (subQ abdomen/thigh) 10-20 days 1-2mg total Advanced/Stack 300-500mcg EOD (every other day) 20-30 days 4-10mg total Microdose 50mcg 3x/week 4 weeks 0.6mg total Injection: SubQ preferred (less pain); rotate sites. Stacking: Pairs with GHRP-6, CJC-1295, or MK-677 for GH synergy (myostatin IGF axis). On-Cycle Support: Monitor liver/kidney (ALT/AST via bloodwork); hydrate heavily. Sides & Risk Mitigation Side Effect Frequency Mitigation Lethargy/Fatigue Common (first week) Taper dose; add BPC-157. Tendon Weakness Moderate (rapid gains) Low-impact training; collagen supps. Water Retention Low AI if stacking estrogenics. Immunogenicity Rare Humanized FLGR242 minimizes. No estrogenic/androgenic activity; suppresses natural myostatin long-term (up to 6 months post-cycle). Sourcing & Legality Research-Only: Not FDA-approved for human use ( Schedule? No, peptide gray area). Buy from lab suppliers (e.g., 99% HPLC/MS verified). Cost: $150-300/10mg vial. Storage: Lyophilized RT stable; reconstituted fridge. Pro Tip: Run bloods pre/post (myostatin levels via ELISA if available; expect 50-80% drop). For max effect, combine with resistance training 1.5g protein/lb BW. If this is for a specific protocol or stack, drop details for optimization. Research responsibly! ����
