How long a B12 shot lasts depends on the form of B12 used in the injection, how severe your deficiency is, and how well your body absorbs the form thats being injected
Up to 30% of the population has a down-regulated MTRR SNP (single-nucleotide polymorphism) potentially impairing this vital process
If you're in a risk group reduced food intake on GLP-1s, plant-based diet, long-term metformin or PPI use, over 50 and fatigue is dragging you down, checking your B12 is one of the highest-ROI moves you can make
Bunn and his colleagues observed that folate and vitamin B12 nutritional status affect the toxicity of antimetabolites, particularly those targeting thymidylate synthase
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