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Some users inject rest days for injury recovery, targeting connective tissue repair rather than hypertrophy

Oral supplements must survive digestion, and many never make it to the bloodstream in usable form

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and in the synthesis of monoamine neurotransmitters, such as serotonin, dopamine, and norepinephrine.[5-7] Methylcobalamin is the preferred form of cobalamin supplementation for neurologic health, and experimental research indicates that methylcobalamin shows better transport to organelles within nerve cells than does cyanocobalamin.*[8]