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The 250500 mcg subcutaneous range used in current research contexts sits below the 1 mg clinical trial dose, partly because subcutaneous bioavailability differs from the oral administration used in some trial arms

The prevalence of cobalamin deficiency among vegetarians assessed by serum vitamin B12: a review of literature. European Journal of Clinical Nutrition 68(5) (2014): 541548

That matters because, unlike most peptides, a small molecule can be studied orally as well as by injection it has no peptide bonds for digestive enzymes to cleave

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How To Put Together a Peptide Stack 6

Because breastfeeding can change the breasts, its often recommended to wait until after you are done having children so that your results are not affected