Can sunscreens legally claim to be waterproof?

The FDA prevents sunscreen companies from labeling products as waterproof, since sunscreens are only water-resistant. Dermatologist Debra Wattenberg, MD, explains this mandate, and how to apply sunscreen properly for the best results.

Top dermatologists share their wisdom on ingredients and SPF levels—plus how much to use, how often to reapply, and more.

How does sunscreen protect your skin? Learn the facts about SPF, UVA, and UVB rays, broad-spectrum sunscreens, and more.

Even better than treating psoriasis is preventing a flare-up in the first place. Here’s how.

Here’s how to use everyday cleaners safely and correctly to ward off germs.

Get the dirt on what causes allergies and asthma.