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Regulatory status can vary by sport and governing body
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B12 shots are often prescribed by medical providers to treat B12 deficiencies and pernicious anemia
Users stopping vitamin C serums generally report gradual benefit decline over 2-4 months with antioxidant protection loss occurring quickly (days to weeks), skin brightness fading over 1-2 months returning toward baseline, and collagen-related firmness improvements showing variable persistence with 30-50% benefit retention long-term for consistent users
Finkley MB et al
If you have been treated for megaloblastic anemia (reduction in the number of red blood cells with an increase in their size) and it is reversing, a decrease in blood potassium levels may occur, which can be fatal
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