glutathione skin & Vitamin C IV Therapy: Benefits & Injections Glutathione Injections For Skin Whitening:

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Some individuals who have deficiencies caused by lack of absorption during digestion respond better to vitamin B12 injections as they are absorbed directly into the body

Since vitamin B12 is found in many foods, deficiency is more common in the elderly, strict vegetarians, or those who take oral contraceptives or medications for gastric disorders or insulin resistance

The answer may be complicated, especially depending on the context of the research

The only way to know is to visit a skin doctor (a dermatologist).