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Journal of Sports Sciences , 29 (sup1), S39S46
Oral supplements depend on intrinsic factor, a stomach protein required for absorption in the small intestine
Some people describe this as feeling mentally foggy or having trouble staying sharp during tasks that require attention
[DOI] [PubMed] [Google Scholar] Kooistra H.S., Rijnberk A., van den Ingh T.S
These systemic effects are uncommon and typically mild
