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In turn, serotonin contributes to melatonin production, which is needed for sleep

Noticeable results often happen within 8 to 12 weeks when combined with changes in diet and being more active

Who may need high dosages of B12: People with absorption difficulties due to insufficient stomach acid, lack of intrinsic factor (pernicious anemia), or gastrointestinal surgery 6 Vegans/strict vegetarians People affected by certain genetic variants, e.g

doi: 10.1016/0024-3205(84)90454-5

doi: 10.1017/S1461145711001179

Alcohol Clin Exp Res 30, 2006
