can vitamin b12 injection cause diarrhea Shots at Home: How, Where & How Often to Inject Yourself Doctor explains clinical signs of

Vitamin B12 supplementation is important in discrete populations People who don't consume animal flesh run the risk of vitamin B12 deficiency that is, unless they take supplements or regularly eat foods fortified with the nutrient, including fortified cereals, fortified plant milks, and fortified nutritional yeast, according to The Vegetarian Resource Group

Visible changes in density, the kind that show up in photographs, generally require five to six months of consistent daily use at a minimum

Lifestyle factors Busy schedules often favor weekly weight loss shots rather than daily injections

Because injections bypass the digestive tract, they may be preferred when absorption is the main concern