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Less common : dizziness, mild gastrointestinal discomfort

Vegans and vegetarians could be even more prone to a deficiency, as most of the significant sources of vitamin B12 come from animal food products

In Conclusion Both B12 pills vs B12 shots can be effective ways to increase your B12 levels

Standard Dosing Range: Low dose: 200 to 250 mcg once daily Moderate dose: 250 to 500 mcg once or twice daily Higher dose: 500 to 800 mcg once or twice daily Weight-Based Dosing: Based on animal study extrapolations, an estimated human equivalent dose is approximately 1.6 mcg/kg body weight, translating to roughly 110 mcg for a 150-pound person and 145 mcg for a 200-pound person when using oral administration

Nishida Y, Rardin MJ, Carrico C, He W, Sahu AK, Gut P, et al