Depends on the vitamin. It's difficult to overdose on Vitamin C for example. Vitamin D should be dosed with caution, but taking e. g. 1000 IU a day should be sa

Depends on the vitamin. It's difficult to overdose on Vitamin C for example. Vitamin D should be dosed with caution, but taking e. g. 1000 IU a day should be safe even if you get it from other sources.