vitamin D levels are almost always caused by excessive vitamin D intake from supplements.
Food is also unlikely to provide enough vitamin D to cause toxicity under normal circumstances.
The biggest concern is usually inappropriate or excessive supplementation.
Check More Than One Supplement Bottle
Here’s an easy mistake to make.
Someone may take:
A standalone vitamin D supplement + a multivitamin + calcium with vitamin D.
Each product may look reasonable by itself, while the total vitamin D intake is much higher than expected.
MedlinePlus specifically recommends checking all supplement labels because
