injectable b12 vs oral Injections vs. Supplements: Which Is Better? Frontiers | Comparative bioavailability study
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[22] The injections are usually given in a clinic setting, but in some cases patients may be taught to self-administer at home under medical guidance

Patients with Leber's Disease: Vitamin B12 levels may exacerbate optic nerve atrophy

doi: 10.1016/j.tem.2016.06.010 40 YoshidaTSemprun-PrietoLSukhanovSDelafontaineP

No toxins
