b12 injection im or sq Cyanocobalamin (b12) 2,000 mcg/mL 30mL Conquer Pharma Intrav – My Store Compounded Cyanocobalamin (Vitamin B12) Injection
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Safety and tolerability of the hexadecapeptide AOD9604 in humans. J Endocrinol Metab 3(12):715

Vitamin B12 also helps prevent megaloblastic anemia, which makes people tired and weak
They have lots of advice on using Vitamin B12
