Does a moisturizer with SPF need a separate sunscreen?

What does the moisturizer need on its label?

Check for both SPF 30 or higher and broad spectrum protection. SPF measures protection against UVB; broad spectrum means protection against both UVA and UVB. On UK labels, look for at least four stars for UVA protection; a UVA symbol inside a circle indicates that the product meets the EU standard. The SPF number is only part of the label check, despite getting the largest office on the packaging.23

Can I use my usual amount of moisturizer?

Only if that amount meets the product's sunscreen directions. Applying sunscreen too thinly reduces its protection, so treat an SPF moisturizer as sunscreen rather than assuming your usual dab is enough. A moisturizer with SPF combines two jobs, not an exemption from the directions. Apply it generously and evenly to exposed skin, including your face, neck and ears. A face moisturizer also does not cover the rest of your exposed body: use sunscreen there too.2

When should I choose a separate sunscreen?

• Choose a separate sunscreen if your moisturizer has an SPF below 30 or lacks broad spectrum protection.
• For outdoor use, choose a sunscreen with broad spectrum protection, SPF 30 or higher and water resistance if your moisturizer lacks any of these.
• Use a water resistant sunscreen if you expect to swim or sweat. Water resistance lasts for the stated 40 or 80 minutes during swimming or sweating; no sunscreen is waterproof.

How do I use it through the day?

1. 1Read the application directions before your morning application. Apply sunscreen before going outdoors, not once you are already in the sun.
2. 2Cover all exposed skin generously. Follow the label's quantity and application instructions rather than reducing the amount because the product is also a moisturizer.
3. 3Reapply every two hours while outdoors. Reapply after swimming, sweating or towel drying, and whenever the product has rubbed off.
4. 4Use shade, protective clothing, a hat and sunglasses as well. No sunscreen completely blocks ultraviolet radiation.

What about cloudy days or sitting by a window?

Clouds do not remove the need for sun protection: ultraviolet radiation can reach your skin on overcast days. Window glass can also let UVA through, including house and workplace windows and many car side windows. Being indoors does not automatically settle the question, particularly if you have a condition that makes you sensitive to sunlight.34

Who needs a more specific sun protection plan?

If you have cutaneous lupus, meaning lupus affecting the skin, protect your skin daily with shade, protective clothing and broad spectrum, water resistant sunscreen with SPF 30 or higher. For diagnosed daylight allergies, a specialist plan can call for SPF 50 or higher with strong UVA protection and additional measures. Some medicines increase sun sensitivity, so ask your prescriber about sun precautions. These situations call for more than deciding whether to buy one bottle or two.345