impact of b12 injection Best Vitamin Site: Administering B12 Shots Vitamin B12 Injections for Aging
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Early pharmacologic approaches to avert anabolic steroid-induced male infertility: a narrative review

(3) changes in the serum levels of homocysteine, and (4) changes in the homeostasis model assessment of insulin resistance (HOMA-IR)

While both have the same goal, the way they deliver B12 to your body is completely different, and that difference is key
Cautions and Contraindications: Avoid B12 Injections if you have Lebers disease

Its not overnight, but most people are glad they did it