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Copper is essential for melanin production the pigment that gives hair its color

Along with there being no reports of it causing birth defects, cancers or any other type of toxicity, Vitamin B12 doesnt even have an established tolerable upper intake level (UL), which is the amount that would cause an overdose or major unwanted side effects

Absorption and transport [edit] Inadequate absorption of vitamin B 12 may be related to coeliac disease

That is understandable

They were declining at the six-month mark, but still seemed to be very good and elevated, and thought to still provide good protection against severe disease, hospitalization, and death