US$ 23.74
b12 injection is for Vitamin Dosage Best Vitamin B12 Injection Site:
Description
Those most commonly affected include people over 50 as the ability to absorb B12 from food naturally declines with age as well as vegetarians and vegans, those with pernicious anaemia, anyone who has undergone gastrointestinal surgery, and those living with digestive conditions such as Crohn's disease or coeliac disease

Symptoms of pernicious anemia include fatigue, weakness, and neurological changes

10.1016/j.cmet.2018.03.002 10 ClarkeC.XiaoR.PlaceE.ZhangZ.SondheimerN.BennettM.et al (2013)

The injection takes just a few seconds and at most youll experience a slight pinch and mild soreness afterward
