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Retrieved January 22, 2026

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What Are the Benefits of B12 Shots

Both compounds have demonstrated favorable safety profiles in preclinical and early clinical research, but combination use has not undergone Phase III human trials

What that means isnt always straightforward: In the Swiss study mentioned above, nearly three-quarters of primary-care docs surveyed reported using a multi-step approach (and not always the same one) when testing for B12 deficiencya practice that Miller says improves the odds of an accurate diagnosis since serum B12 levels alone dont always accurately identify a deficiency

its an autoimmune disorder where the bodys immune system mistakenly attacks the stomach cells that produce a crucial protein called intrinsic factor