why do i feel worse after my b12 injection reddit What happens if you inject wrong? B12 Shots at Home: How,

According to the National Institutes of Health, oral B12 has a 1 to 2 percent absorption rate

The people who are at the highest risk of B12 insufficiency or deficiency are older adults, those with atrophic gastritis, gastrointestinal disorders, pernicious anemia, those who have had gastrointestinal surgery, vegans, and vegetarians

B12 and B Vitamins Testing B vitamins play crucial roles in cellular metabolism and hair follicle function, making comprehensive testing essential for identifying underlying causes of hair loss and poor hair quality

I guess that's because usually there aren't any - even the acne only affects a very few people