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If you do, in fact, have a B12 deficiency, injections of the vitamin will reduce the following symptoms and restore your energy as well as your metabolism

Mutat Res 478(12):2343 Klungland A, Hoss M, Gunz D, Constantinou A, Clarkson SG, Doetsch PW, Bolton PH, Wood RD, Lindahl T (1999) Base excision repair of oxidative DNA damage activated by XPG protein

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Mammalian cells contain plasma membrane transporters for dipeptides and tripeptides (e.g., Rubio-Aliaga and Daniel, 2002)

10.1016/j.prp.2025.155947 4 AlexopoulouL.HoltA

The only thing one of my doctors discovered is that I am D deficient