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Folic acid supplements can mask a vitamin B12 deficiency and potentially delay its diagnosis or treatment, but they dont directly interfere with B12 injections

GHK (glycyl-L-histidyl-L-lysine) is a naturally occurring tripeptide found in mammalian plasma

doi:10.1023/b:mebr.0000043979.58915.41[PubMed] 82

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Loss of GPX4 protein expression in NRF1-deficient cells sensitized cells to ferroptosis, whereas in cells lacking GPX4, overexpression of NRF1 failed to inhibit ferroptosis

It also plays an essential role in folate and related one-carbon metabolism, where FAD is required as a cofactor for methylenetetrahydrofolate reductase (MTHFR), a key folate-metabolizing enzyme