Friends, My doc has prescribed me Vitamin D2 50,000 units once a week for 3 months and then 1000 units to be continued per day, as my vitamin D are low. Also vitamin B12 1000 units for an year. Im skeptical to start this fearing about side effects. Has anyone taken such high dosage (50,000 units) and will it be ok or cause any side effects? I googled and learnt it sometimes causes hives or breathing trouble. It really scares me. I need some inputs before i start.