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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
Mixing different peptides can lead to unknown chemical interactions, potentially degrading one or both compounds and creating an unpredictable solution

In some cases, these reactions are linked to cobalt, the central metal ion in the Vitamin B12 molecule
T.VantlerM.et al (2006)