Of the UV solar radiation that does reach the earth, up to 95% is UVA, and about 5% is UVB. You need a broad-spectrum sunscreen, every day all year round, to protect against both.
If you’re worried that you aren’t getting enough vitamin D with out UV exposure, discuss your options with your doctor. Many people can get the vitamin D they need from foods and vitamins. Supplements can be a great way to get the vitamin D you need without increasing your risk for skin cancer.
You will need a 1/2 t. for your face and neck .
You can't use too much spf slather it on.
In this case more is better!