As researchers learn more about its potential to extend lifespan, boost immunity, improve strength and physical performance, and ward off age-related illnesses, more people are supplementing with glutathionewhich is generally very safe
By 1971, this practice had been discontinued, in part because it was realized that folic acid is ineffective in treating pernicious anemia, and that vitamin B-12 administration is the proper approach to treat this disease (11)
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However, older people are also in greater need of B12 due to its role in red blood cell production, cognitive function, homocysteine metabolism, myelin synthesis, and immune health
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But if you are worried, remember that other vitamin B12 supplements exist