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Serum B12 reference ranges vary between laboratories, but generally, levels below 148 pmol/L are considered deficient, whilst levels between 148258 pmol/L are regarded as borderline and may warrant further investigation or a trial of treatment, particularly if symptoms are present
J Dtsch Dermatol Ges
About this article Cite this article Lotz-Havla, A.S., Wei, K.J., Schiergens, K.A
Conclusions Nutraceuticals represent promising strategies for preventing, delaying, and addressing premature aging of the skin, especially as women advance in years (particularly after 30 years of age, when estrogen levels begin to decline and remarkably after menopause when estrogen production ceases from the ovaries)
