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These are not trivial percentages

Also known as cobalamin, vitamin B12 plays a crucial role in our bodily processes, including skin, hair, and nail health

That is not a reason to dismiss it

Other factors associated with technological and societal change must account for the remaining decline in sensitivity, and this is a very active area of investigation

Radiofrequency devices like Venus Viva are clinical-grade only

(1982) examined the contents of three multivitamin preparations and, after incubating them in water at 37C (body temperature) for 2 hours, found that 20% to 90% of the B12 had degraded to inactive analogs