b12 injection bristol Vitamin Vitamin B-12 3000 mcg Injection

Credit: Pure Encapsulations Pros Expert-recommended No filler ingredients 180 day supply Cons Not the most affordable pick on our list With Grays stamp of approval, these capsules come highly recommended by people who are popping 1 to 3 of them daily due to the lack of sketchy filler ingredients and ability to noticeably boost energy levels

Recommendations Start at 150 mcg

Oral B12 requires a protein called intrinsic factor in the stomach to be absorbed properly

So typically, when someone is deficient in B12, and they get a B12 shot, they feel great

Note that these are side effects that healthy people may experience when taking large doses of these vitamins