A multitude of studies shows that many people are unable to absorb or store sufficient amounts of vitamin B12
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Side effects are uncommon and typically limited to mild injection site reactions
For body-composition goals (lean mass gain, fat loss), a mid-range dose may be more effective
While B12 itself doesnt cause weight loss, its role in energy metabolism means a deficiency could lead to fatigue and reduced physical activity, indirectly affecting weight management
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