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There is clearly no simple relationship between blood levels of the vitamin and acne.

You can consume vitamin B12 through eggs, dairy, fish and meat, or through fortified foods such as some plant-based milks, cereals or nutritional yeast. According to data from the National Institutes of Health Office of Dietary Supplements, men and women age 19 and older need 2.4 mcg of vitamin B12 per day

However, some sources indicate that the benzyl alcohol may degrade IGF-1 LR3 structure over time, potentially reducing potency within days to weeks

There are currently four theories about the mechanism by which vitamin B12 deficiency causes neurological disorders [87,88,89]: (i) vitamin B12 exists in two active forms, methylcobalamin and adenosylcobalamin

Structural basis for dimerization of a paramyxovirus polymerase complex