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In a 2017 bioavailability study, methylcobalamin supplementation (1,000 mcg/day) led to 13% higher liver retention and lower urinary loss compared to cyanocobalamin, translating to sustained energy in deficient adults

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doi: 10.1016/S0024-3205(00)00803-1

The most common B12/MIC side effect is pain, redness, or itching at the injection site

In fact, reduced glutathione is the biologically active form that can be directly utilized by the human body, exerting important functions such as acting as an antioxidant and facilitating detoxification

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