My daughter was diagnosed with very low vitamin D levels last year. I was surprised because we live in California, and she goes outside for sports and for lunch every day it isn’t raining (which is most of the year).
We started supplementing her with 1000 units every day, but that didn’t make it go up much, so I upped it to 2000 units every day. She needs to be tested again.
After she was diagnosed, I tested my levels, and they were low. However, I’ve had an injured hip and I haven’t been outside much.
Please see the NIH info in post #10.