How many doses can be used patient have deficiency of vitamin d3 (8.5) if normal (30-100); please?

50,000 U Weekly: With low levels of vitamin d one may have to take mega-doses of vitamin d for about 3 months to bring the level up; then one can maintain it with 1000-2000 units daily. Eating vitamin d rich foods and also sun exposure (at least 15 minutes daily with 75% of the body exposed).

Very low vit D level: Imho you have severe vit d deficiency a good level is >50 ANS <100 dose for most is 1000 iu/ 25 # body wt get rechecked about 3 months after start of suplementation this is a very important topic !