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How long medications take to take effect depends on the degree of melasma, the person's condition, and the type of medication used
NHS laboratories generally define deficiency as a serum B12 below approximately 148 pmol/L (equivalent to roughly 200 ng/L or pg/mL), though reference ranges vary between laboratories and results should always be interpreted in the context of local ranges and the patient's clinical presentation
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Because B12 levels arent checked during routine blood work, a deficiency can go undetected for years, Dr