[10] Other uncommon adverse effects reported with very high doses include dermatological lesions (photosensitivity and skin rash), gastrointestinal upset, and in some cases dependency syndromes (e.g
Transparent sourcing for reliable research applications
If you have a vitamin B12 deficiency, you might feel symptoms like fatigue, weakness, or tingling in your hands and feet
On the other hand, it would seem that a lack of vitamin B12 can cause people to lose their appetite, resulting in a decrease in weight rather than an increase in weight
Some patients have also experienced a hypersensitivity reaction following intramuscular injection that has resulted in anaphylactic shock and death
Int J Food Sci Nutr 2009;5:7176 Hermann L, Nilsson B, Wettre S