Some potential side effects include: Nausea and gastrointestinal discomfort Allergic reactions, including rashes and itching Respiratory issues in individuals with asthma (particularly with inhaled forms) Before starting any supplementation, its crucial to consult with a healthcare provider, especially if you are pregnant, nursing, or taking medications
So, if your production of stomach acid decreases, then your absorption of B12 is going to decrease, and that is going to give you a risk of vitamin B12 deficiency
After getting a B12 shot, you should watch out for these symptoms and see a doctor if you have: Strong pain where you got the shot Some stomach upset Feeling swollen Skin feeling itchy for a while In really rare cases, there might be more serious risks like: A severe allergic reaction called anaphylaxis Fluid build-up in the lungs Heart problems Blood clots in the bodys blood vessels A type of blood cancer, called polycythemia vera
Pharmacogenetics 11 , 663669
The crystal was directly mounted without any cryoprotectants