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Standard oral glutathione has only 0.7% bioavailability but remains generally well-tolerated at recommended doses

As a result of this B12 deficiency, they may feel tired and weak or experience heart palpitations, weight loss, and loss of appetite

doi: 10.1016/S0360-3016(01)01522-X

Vitamins, including A and C, and minerals like zinc and magnesium are often marketed for helping immunity, and according to Hancock, "in most of those cases there is a very, very good body of evidence that suggests that they're beneficial." Hancock says he takes a multivitamin every day

However in recent years liposomal glutathione has hit the market

When injected, they activate fibroblast cells in the skin, promoting deep tissue regeneration, hydration, and anti-inflammatory benefits