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The topical concentration determines how much peptide reaches dermal tissue per application
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Why a normal or high total B12 can coexist with cellular deficiency Total B12 measures what is in the blood, not what has reached the cells, so a high or normal value does not rule out a functional shortfall
It depends on the health conditions being studied, the dosage, and individual factors
Carpenter JF, Manning MC
NICE recommends lifelong intramuscular replacement for vitamin B12 deficiency caused by autoimmune gastritis, or after total gastrectomy or complete terminal ileal resection
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