[Q] Does UVA cancel out vitamin D?

[AngelaG]

I recently read an article that stated that UVA cancels out vitaminD and UVB creates it is this true? It also said that sitting by a window or in a car only lets in UVA so that people are cancelling their vitamin D more than they know. I am vitamin D deficient and was wondering if I go outside on a cloudy day am I only getting UVA? Thanks, Angela