Vitamin D (testing and supplements)
I had my vitamin D levels tested at the end of the summer (immediately after coming back from a beach vacation): They were in the optimal range, so my doctor told me I don't need any supplements for now.
However, it is already mid-October and my sun exposure hasn't been that great. Even when I go out in the sun, I feel like it is not strong enough to make any impact.
When should I get my next vit-D lab test so I can see if I need to start supplementing?