can b12 injections cause upset stomach Understanding the Vitamin Shot: Benefits, Risks, and Dosage Guide do b12 injections cause diarrhea

Here are some of the most common reasons for vitamin B12 deficiency: Pernicious Anemia This is the most common cause of vitamin B12 deficiency worldwide and mainly affects people of Northern European ancestry

We do not recommend self-administering B12 or any supplementation without proper medical guidance, as unnecessary supplementation may mask underlying health issues

In addition to fatigue, a deficiency of B12 can lead to other symptoms like pale skin, headaches, depression, gastrointestinal problems, difficulty concentrating, decreased mental function, mouth and tongue pain or inflammation, and paresthesia in your hands and feet

Genetics play a role in B12 deficiency Genetic polymorphisms such as MTHFR or MTRR can contribute to low usable B12