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Safety and Side Effects of Methylcobalamin and Adenosylcobalamin Side Effects and Safety Common Side Effects (mild to moderate) : Mild headache Nausea or upset stomach Skin rash or itching Rare Side Effects (moderate to severe) : Anxiety or nervousness Chest pain or shortness of breath Hypersensitivity reactions (e.g., swelling, severe rash) Safety Summary : Methylcobalamin is generally well-tolerated when taken as directed

Beyond the gut, we have to consider the systemic picture

But copper ions in a petri dish are not the same as GHK-Cu applied to a scalp

Women are more often diagnosed with ME/CFS, potentially due to higher antibiotic exposure compared to men [73, 74]

Deficiency In healthy adults, overt vitamin B 12 deficiency is uncommon, mainly because total body stores can exceed 2,500 g, daily turnover is slow, and dietary intake of only 2.4 g/day is sufficient to maintain adequate vitamin B 12 status (see The RDA) (4)