What are the healthiest, safest sunscreens to use?

Sunscreens: Important issues: 1. use a product with a high enough SPF – recommend SPF of 50 (or even higher). 2. Apply at least 15 to 20 minutes prior to sun exposure. 3. Apply adequately. tudies show that many people who use spray only use a 1/4th of the amount needed. You may need to spray for up to 6 seconds per area. A benefit of spray over lotion is that it may be used on hard to reach areas.