dihexa studies Shop Research Peptides What is Dihexa? Benefits, mechanism,
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Those with the lowest B12 levels had the biggest risk of decline in physical function and development of muscle wasting, diminished strength, and weight loss (5)

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I'm not medically trained but if someone has symptoms consistent with B12 deficiency and the symptoms improve/disappear with B12 injections/B12 supplements then it would suggest to me that the person needed B12
But figuring out which ones right for you can be tricky
