Even with supplements, digestive problems or poor absorption can make it challenging to get enough B-12
[1] [3] The ingredients of Ascorbic Acid (Vitamin C) Injection are ascorbic acid as the active ingredient, with water for injection as the vehicle, and, in the preserved formulation, a suitable preservative to maintain sterility and stability during multi-dose use
Sources: Sebecic B, Nikolic V, Sikiric P, et al
Disposal : Used pens should be disposed of in an FDA-cleared sharps disposal container immediately after use
Keep in mind that many health insurance plans do not cover the cost of vitamin B12 injections when used for lifestyle or wellness purposes, so it's important you speak with your healthcare provider and insurance company