subcutaneous vitamin b12 injections How to self-inject intramuscular - Overview Best Vitamin B12 Injection Site:

NAD+, NMN and nicotinamide riboside supply the salvage pathway with material, adding substrate at or near the top of the route to the dinucleotide

Other factors that could lead to B12 deficiency are: Lack of adequate production of the intrinsic factor needed for B12 absorption B12 deficiency is common in elderly people as absorption of the vitamin reduces with age People who have had any intestinal surgery, such as that for weight loss Those with gut conditions such as Crohn's Disease, inflammatory bowel disease, or celiac disease QUESTION See Answer Vitamin B12 injections Vitamin B12 supplements are given based on the condition that causes deficiency

Please see point 10 above

You may feel slower when making decisions or find it hard to concentrate