The recommended dietary allowance for vitamin B12 in someone with normal absorption is only about 2.4 mcg per day, according to the Food and Nutrition Board
However, there are some differences between the two forms of supplementation: Absorption : B complex injections are typically more effective at increasing blood levels of the B vitamins than oral supplements because they bypass the digestive system and are absorbed directly into the bloodstream
The neurologic side effects include confusion, dizziness, drowsiness, slurred speech, balancing issue, loss of consciousness, muscular paralysis, fatigue, numbness, tingling, and/or burning
So for archaea to become stuck and overgrown, the MMC needs to be damaged or not working properly