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Many sublingual supplements provide between 1,000 mcg and 5,000 mcg per serving, although the appropriate amount depends on individual needs and should follow the product label or your healthcare provider's guidance
However, elite sports organizations that follow WADA guidelines may prohibit any substance that enhances NAD or mimics metabolic regulation
no injectable protocol has been validated in controlled human trials
However, by consuming various B12 sources you can achieve the recommended daily intake without trouble
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