Groups at increased risk of B12 deficiency include: Vegans and strict vegetarians , who avoid all animal products and are at significant risk without supplementation or fortified foods Older adults , in whom reduced stomach acid production impairs B12 absorption People with pernicious anaemia , an autoimmune condition that destroys intrinsic factor-producing cells Those who have undergone gastric surgery , including bariatric procedures, which can reduce intrinsic factor availability Individuals taking long-term metformin for type 2 diabetes, as this medication is associated with reduced B12 absorption the MHRA has issued specific safety advice on monitoring B12 levels in this group [6] [7] People with conditions affecting the small intestine , such as Crohn's disease or coeliac disease Symptoms of B12 deficiency can include fatigue, weakness, pins and needles, memory difficulties, and a sore or inflamed tongue (glossitis)

Malabsorption Issues : If you have conditions like pernicious anemia, Crohns disease, or have had weight loss surgery, vitamin B12 injections may be a more effective option due to the bodys difficulty absorbing B12 through the digestive tract
This hormone helps to regulate your blood sugar levels, and also sends signals to receptors in your brain that manage your appetite, allowing you to feel fuller for longer
This designation allows the use of this chemical strictly for in-vitro laboratory testing and experimentation