which is better nac or glutathione L -Glutathione Collagen Detoxification Whitening Antioxidant Glutathione vs. NAC: An Expert
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The power is genuine

doi: 10.1016/S0944-5013(97)80034-1

If the descriptor says per 1 mg and the patient receives 500 mg, the claim carries 500 units

This does not mean you cannot use both
