FAQs
Only under medical supervision. 10,000 IU is above the 4,000 IU daily upper limit for adults, so take it only if a blood test shows low vitamin D and your doctor advises it, and recheck your level after 8 to 12 weeks.
Both give a similar weekly total: 70,000 IU against 60,000 IU. In a trial of 338 older adults, the same total dose raised 25(OH)D more when given daily than weekly. Your doctor will choose the schedule.
With your largest meal of the day. A fat-containing meal gave 32% higher peak blood vitamin D3 than a fat-free meal in a study of 50 older adults (Dawson-Hughes et al., 2015).
Most labs treat a 25(OH)D level below 20 ng/mL as deficient. Ask your doctor to read your result and set your target.





