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In one study of men being evaluated for concerns around fertility, those with lower B12 levels also tended to have lower testosterone

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Sustained activation of autophagy suppresses adipocyte maturation via a lipolysis-dependent mechanism

Lactating women have higher daily needs for B vitamins (for instance, riboflavin 1.6 mg/day, niacin ~17 mg NE/day), because some of the maternal intake is secreted in milk to nourish the infant
