Some patients might develop allergic reaction and present with symptoms of rashes, hives, swelling of lips, tongue and throat along with difficulty breathing, chest tightness due to inflamed airways
It is unusual to overdose on vitamins through megadose supplements, but people sometimes receive an unsafe dose of some vitamins by combining fortified foods with supplements
Biotin is not considered to be toxic, and no tolerable upper intake level has been established
This affects approximately 6-11% of users across clinical trials
Some members of this society take high or very high dose oral tablets in stead of injections though this is a tiny minority
Common signs of B12 deficiency include persistent fatigue, pins and needles, and low mood