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Only a medical professional can conclusively determine if you have a vitamin B12 deficiency
10.15620/cdc:112079 Mortality in the united states, 2020 NCHS data brief, no 427
Textbook of Natural Medicine, Second Edition
Dietary deficiency: Strict vegans or very poor diets may lack animal-source B12
Because GHK-Cu is a naturally occurring peptide already present in your body, most women tolerate it well under physician supervision
This randomized clinical trial demonstrates that vitamin B12 supplementation, alone or with folic acid, significantly improves blood sugar control and insulin resistance in patients with type 2 diabetes.
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