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If your levels don't improve upon supplementation, investigate underlying GI conditions and medication interactions that could impair absorption
Does it improve on rest days from your protocol
One trial used 2000 g/day vitamin B 12 and demonstrated a mean difference of 680 pg/mL (95% confidence interval 392.7 to 967.3) in favor of oral vitamin B 12
If you dont get enough vitamin B12 or you have low B12 absorption, your body will start to respond
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