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S2CID 460021
They work by delivering the vitamin directly into your bloodstream through the nasal membranes
Silverline Labs LLC makes no benefit, efficacy, or use claims about any product
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When B12 levels fall in the indeterminate range or when clinical suspicion remains high despite normal B12 levels, additional investigations may include: Holotranscobalamin (active B12) : Available in some NHS laboratories
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