Vitamin D3 (“cholecalciferol”) is better at keeping your blood ... “Over 50” multivitamins often have 500 IU’s in one tablet. Women’s multivitamins often have 800 IU’s. There Aren’t Many High Vitamin ...

400 IU (10 mcg) per day increases vitamin D blood levels 4 ng/ml (10 nmol/L). 500 IU (12.5 mcg) per day increases vitamin D blood levels 5 ng/ml (12.5 nmol/L). 800 IU (20 mcg) per day increases ...

We also like that each tablet provides 1000 IU of vitamin D3, which is the recommended daily dose. We’ve noticed that our vitamin D levels have improved since we started taking this supplement ...