are vitamin b12 injections better than pills vs. Supplements – Known Nutrition UK Oral B12 vs. B12 Injections:

Step 3 Make sure the needle is placed at a 90 degree angle to the skin

I recommend: at least 2,000 mcg (g) cyanocobalamin once each week, ideally as a chewable, sublingual, or liquid supplement taken on an empty stomach or at least 50 mcg daily of supplemental cyanocobalamin or a serving of B12-fortified foods three times a day, each containing at least 190 percent of the Daily Value listed on the nutrition facts label Those over 65 years of age should take at least 1,000 mcg (g) cyanocobalamin every day

This is particularly useful in research settings working with research grade peptides across a series of experiments rather than a single isolated test

doi: 10.1155/2020/8864100