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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
Blog BPC 157 for Immune Support: Does it Really Work
I have, for the past few years, been suffering from symptoms relating to B12 deficiency - extreme
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