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B12 injections are a common way to administer the vitamin

TB-500 might have slightly higher theoretical risk due to systemic action

This suggests very little of it actually reaches the brain

The instant a needle penetrates the rubber stopper, three things happen: air enters the vial headspace, the sterile barrier is permanently breached, and the multi-dose use clock starts

Complete supply calculation for a 16-week protocol Weeks 1-4 (2mg/week): 2mg x 4 weeks = 8mg total Weeks 5-8 (4mg/week): 4mg x 4 weeks = 16mg total Weeks 9-12 (8mg/week): 8mg x 4 weeks = 32mg total Weeks 13-16 (12mg/week): 12mg x 4 weeks = 48mg total Grand total: 104mg over 16 weeks Now translate that into vials: Using 10mg vials exclusively: 104mg / 10mg = 10.4 vials