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Annu Rev Nutr 37:131156
This is the central mechanism most reviews focus on
A large number of patients lose a few percent of body weight over a period of months, enough in some cases to restore ovulation
These vitamins play key roles in converting food into energy, maintaining healthy skin and muscles, supporting brain function, and protecting against infections
More significant results like muscle growth or skin rejuvenation usually develop over weeks to months
Vitamin B12 deficiency is linked to hematologic, neurologic, and psychiatric diseases, plus cardiovascular decline
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