What happens if we take 200000 iu (5 mg) of vitamin d3 once in a month by oral injection then how much iu are we going to take daily ?

Vitamin D Dose: You are asking about dosing by "oral injection". Oral typically means you are going to swallow it. Injection typically means you are using a needle to inject it either into the muscle or into the subcutaneous tissue. Vitamin D is a fat soluble vitamin, and it is very often low. It is important not to use a very high dos without knowing your level of vitamin d (25-OH).