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oral glutathione dosage for skin whitening as a agent: Facts, myths, evidence and controversies How To Take Glutathione Tablets:
Description
In most cases, short-term IV therapy seems to fix things in a matter of months

PMID 19832808
Vegetarians and vegans who may not get enough B12 from their diet, are at high risk of developing a B12 deficiency and could benefit from injections to prevent a deficiency

doi: 10.1186/1472-6882-14-225

for others, its just a marketing myth
