People can also have 'normal' levels of B12 in their blood, but be symptomatic - this is known as a functional B12 deficiency
Hum Mol Genet 8 : 425430 Campo GM, D'Ascola A, Avenoso A, Campo S, Ferlazzo AM, Micali C, Zanghi L, Calatroni A 2004 Glycosaminoglycans reduce oxidative damage induced by copper (Cu +2 ), iron (Fe +2 ) and hydrogen peroxide (H2O2) in human fibroblast cultures
Quintana-Cabrera R, Quirin C, Glytsou C, Corrado M, Urbani A, Pellattiero A, et al
If it remains cloudy after 10 minutes of gentle swirling, something is wrong
Simultaneously, it is essential to recognize that the restricted penetration of UV may be a key determinant in its restricted application, suggesting its suitability primarily for treating tumors confined to the body's surface