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Along with there being no reports of it causing birth defects, cancers or any other type of toxicity, Vitamin B12 doesnt even have an established tolerable upper intake level (UL), which is the amount that would cause an overdose or major unwanted side effects

doi:10.1016/j.asmart.2019.10.002 83

Vitamin injections deliver essential nutrients directly into the body for improved energy, immunity, and recovery

Therefore, treatment should only be considered upon the recommendation of a healthcare professional after assessing the potential benefits and risks

Improper use: Over-application or incorrect layering can overwhelm the skin