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can b12 injections be dangerous Do You Need a Prescription for Injections? Too Much Vitamin B12: Risks,
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(PubMed) Chrysant SG, Chrysant GS

This is evidenced in a study examining identical twins in which environmental factors shared by children at age 13 accounted for 78% to 84% of sport participation, whereas genetic differences provided no contribution at all
B12 deficiency can bring a wide variety of symptoms, due to the nerves and brain function being negatively affected

This is felt to be due to the detoxification effect of B12 in patients who have methylation issues
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