Some sunscreens offer no protection

Zinc Oxide is one of the most effective sun screen ingredients.When choosing a sunscreen remember that according to the Environmental Protection Agency (EPA), Zinc Oxide gives you the highest level of protection against UVA rays. UVA rays cause premature aging and contribute to skin cancer. Some chemical sunscreens like PABA, Homosalate, and others provide no UVA protection at all! Know what you are using to protect your skin and body! Always read sunscreen ingredients before you buy, and check the expiration dates.
Here is the link to the EPA’s chart showing the relative effectiveness of different sunscreen ingredients. It is one of the best we have seen: