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In men especially, low levels may affect: Energy levels Libido and sexual performance Muscle mass and strength Mood and motivation Body composition Bone density However, keep in mind that low energy and low motivation can come from many different causes besides B12 deficiency
Since vitamin B 12 is a determinant of homocysteine metabolism, it was suggested that the risk of osteoporotic fractures in older subjects might be enhanced by vitamin B 12 deficiency
It fights tiredness, so staying active and keeping up with exercise becomes easier
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