The vitamins may take some time to fully absorb into the body, meaning with injections it may take a few days or weeks before the effects are noticeable, and may take a bit longer for vitamin supplements, but at the recommendation of a doctor, you should feel better with the correct amount of vitamin B12 being taken regularly
Nutr Res 29(2):8288 Mostafa-Hedeab G, Behairy A, Abd-Elhakim YM, Mohamed AAR, Noreldin AE, Dahran N, Gaber RA, Alqahtani LS, Essawi WM, Eskandrani AA, El-Shetry ES (2023) Green synthesized zinc oxide nanoparticles using Moringa olifera ethanolic extract lessens acrylamide-induced testicular damage, apoptosis, and steroidogenesis-related gene dysregulation in adult rats
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