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The median dietary B12 intake across the VITAL cohort was 6.42 g/day, resulting in ~19.1 g of B12 absorbed per week from food
Those numbers buy you a licensed medical provider, a 503A compounding pharmacy supply chain, individualized dosing, in-person injection training, and follow-up at the clinic
Standard Dosing Ranges The most extensively studied dosing protocols for subcutaneous administration include: Research-Based Dosing Protocols Beginner/Conservative Protocol: Dose: 250-300 mcg once daily Duration: 4-8 weeks initial assessment period Rationale: Allows tolerance assessment and response evaluation at lower end of therapeutic range Standard Protocol: Dose: 300-500 mcg once daily Duration: 12-24 weeks based on clinical trials Rationale: Most commonly studied range in human research with optimal benefit-to-safety ratio Advanced Protocol: Dose: 500 mcg-1 mg once daily Duration: 12-24 weeks under close medical monitoring Rationale: Upper clinical range
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