evidence for vitamin b12 injections Is there that a injection can cause an acne breakout? Best Vitamin B12 Injection Sites

[95] Intramuscular or intravenous injection [edit] Injection of hydroxycobalamin is often used if digestive absorption is impaired, [2] but this course of action may not be necessary with high-dose oral supplements (such as 0.51.0 mg or more), [97] [98] because with large quantities of the vitamin taken orally, even the 1% to 5% of free crystalline B 12 that is absorbed along the entire intestine by passive diffusion may be sufficient to provide a necessary amount

Injection delivers 100% every time

10.1158/1078-0432.CCR-11-1429 79

Make sure to see a doctor instead

Cyclical use with defined breaks is preferred as a precaution as long as the long-term consequences of sustained NNMT inhibition remain unstudied