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The published research literature has investigated: Gene expression modulation across hundreds of genes (documented in microarray studies) Collagen synthesis and skin remodeling Tissue protection through antioxidant and copper-dependent mechanisms Wound healing and dermatological research Various aging-related cellular processes The mechanisms don't overlap meaningfully

Try to find one that contains right around the RDA for this vitamin, or only a bit more, and see if you can find a methylated one (that is, methylcobalamin)

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doi: 10.1016/j.cccn.2004.08.020

J Endocrinol Investig 19:433440 Muoz MT, Barrios V, Pozo J, Argente J (1996) Insulin-like growth factor I, its binding proteins 1 and 3, and growth hormone-binding protein in children and adolescents with insulin-dependent diabetes mellitus: clinical implications

Physiological reviews 99(3):13251380 Boyce R, Williams S, Adamantidis A (2017) REM sleep and memory