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Kennedy Jr., who oversees the FDA and other major health agencies as the secretary of Health and Human Services, knows this history

This preservative helps prevent the growth of bacteria after the vial has been opened

Methionine is an essential amino acid, and selenium is an antioxidant that acts as a cofactor for glutathione peroxidase which neutralizes hydrogen peroxide (see Figure 1)

While there is no data to establish the safety of 5-amino-1MQ in humans, rodent studies have found no significant adverse effects [1, 6, 11]

Such findings suggest potential interactions with epidermal processes relevant to visual appearance, though outcomes remain highly context-dependent