If B12 blood levels and MMA are both high, a functional B12 deficiency could be preventing B12 being useful at cell/tissue level
Nutritional management of thyroiditis of Hashimoto
If your protocol requires a 1mg dose, you would draw 0.1 mL of the solution
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A 2021 systematic review of 16 randomized controlled trials and 6,276 participants (Markun and colleagues, Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue, Nutrients, 2021) found that B12 supplementation does not reliably reduce fatigue in people who are not deficient