can humans use animal b12 injections Cobalife™ VB12 Injection for Sheep and Cattle Vitamin B12 Injection (Nature Vet)

B12 is water soluble vitamin so there's no worry of overdosing them with B12

Since your body naturally does not make vitamin B12 on its own, you will have to take it from another source like animal-based foods, pill supplements, or injections

By selectively inhibiting NNMT , 5-Amino-1MQ can reduce the methylation of nicotinamide, leading to increased intracellular NAD availability and enhanced metabolic activity

similarly, while the niacinamide in this compounded B-Complex is in a moderate dose, caution is advised in patients with untreated peptic ulcers or significant hepatic impairment, as even moderate niacin supplementation could aggravate these conditions (e.g

Here are the genuine clinical reasons, what is normal, and the warning signs that mean you should see a doctor

[5] Avoid B12 shots if: You have kidney or liver disease