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"Homocysteine and MTHFR Mutations: Relation to Thrombosis and Coronary Artery Disease"

Typically, people with a diagnosed B12 deficiency might receive injections every few weeks or months to maintain healthy B12 levels

Effects of two-year vitamin B12 and folic acid supplementation on depressive symptoms and quality of life in older adults with elevated homocysteine concentrations: additional results from the B-PROOF study, an RCT

My TSH and T4 have never been that far out of range but with the proper testing I found Hashimotos, which explained my constant fatigue and irregular periods (they can be anywhere from 14 days to 50+ and last 2-3 days or up to 10, and be very heavy or very light, truly irregular in all manner of ways!) Oh and folate needs testing too