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However, this does not explain why human tissues better retain methylcobalamin, making it more effective than cyanocobalamin in increasing active B12 levels [110]

Factors like poor absorption, certain medications, or lifestyle choices (like a vegetarian or vegan diet) can leave you deficient

Clin Cosmet Investig Dermatol 2014

UV protection: Without sunscreen, UV rays will continue to trigger melanin production, counteracting any benefit from glutathione