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People with known allergies to copper or to any of the amino acids in the peptide sequence should avoid AHK-Cu

Pernicious anaemia: self-administration of hydroxocobalamin in the covid-19 crisis BMJ 2020;369:m2380

Feeling sluggish, foggy, or just not yourself

On the other hand, individuals with a slower metabolism or mild deficiency might experience prolonged benefits

This may represent a normal part of follicle cycling acceleration rather than a true adverse effect

Bone health A study published in the Journal of Bone and Mineral Research (5) found that low B-12 was linked with poor bone mineral density, suggesting a role for the vitamin in bone formation