Let’s be honest. Sunscreen should be a non-negotiable part of your daily routine, just like brushing your teeth. That doesn’t mean it has to feel like a chore. With sunnier days ahead, now is the perfect time to refresh your sun protection game.
Why does it matter so much? Because ultraviolet (UV) rays are one of the top contributors to premature skin aging and, more seriously, skin cancer. Wrinkles, dark spots, sagging, and loss of elasticity often have more to do with sun exposure than with age. And yes, even on cloudy days or during short walks to the car, your skin is still being exposed.
The Key to Protection: Consistency and Application
Using sunscreen properly is as important as choosing the right product. Here’s how to do it right:
- Use about 1/4 teaspoon for your face (roughly a nickel-sized amount)
- Use 1 full ounce for your body (about the size of a shot glass)
- Reapply every two hours, or sooner if swimming or sweating
The biggest secret to consistency? Finding a sunscreen you actually enjoy using.
What SPF Really Means
SPF stands for Sun Protection Factor. It tells you how much longer your skin can be exposed to sunlight before starting to redden compared to not wearing sunscreen at all. For example, SPF 30 means it would take 30 times longer to burn.
Keep in mind that this is based on ideal lab conditions. Real-world factors like sweat, water, rubbing, and uneven application can reduce protection significantly.
Importantly, SPF mostly measures protection against UVB rays — the ones that cause sunburn and directly damage DNA. However, UVA rays are also a major concern. They penetrate deeper, contribute to aging, and also play a role in skin cancer.
Always choose a sunscreen labeled “broad spectrum.” This ensures it covers both UVA and UVB.
What About Super-High SPFs?
You don’t need to obsess over SPF 100. The difference in protection is minimal once you get past SPF 30. Here’s a quick breakdown:
- SPF 15 blocks around 93% of UVB rays
- SPF 30 blocks about 97%
- SPF 50 blocks about 98%
The key takeaway: Choose SPF 30 or higher, make sure it’s broad spectrum, and reapply regularly. That matters more than chasing ultra-high numbers.
PA+ Ratings: A UVA Bonus
Some sunscreens, especially Korean and Japanese brands, also list a PA rating that measures UVA protection.
- PA+: Some UVA protection
- PA++: Moderate protection
- PA+++: High protection
- PA++++: Very high protection
More plus signs mean better protection from aging and pigmentation caused by UVA rays.
If You're Sweating or Swimming: Look for Water Resistance
Headed to the beach, pool, or gym? You’ll want a sunscreen labeled as water-resistant. The FDA allows only two official claims:
- Water-resistant for 40 minutes
- Water-resistant for 80 minutes
You won’t see labels like “waterproof” or “sweat-proof” anymore because no sunscreen is truly immune to water or sweat. Always reapply after swimming, sweating, or towel-drying.
Mineral vs. Chemical Sunscreen: What’s the Difference?
There’s a lot of buzz around these terms, so here’s what you need to know.
1. Chemical Sunscreens
How they work: They absorb into the top layer of your skin and transform UV rays into heat, which is released from the body.
Common ingredients: Avobenzone, Octinoxate, Oxybenzone
Pros: Lightweight, easy to apply, no white cast
Cons: Some concerns about systemic absorption and environmental impact, especially on coral reefs
2. Mineral (Physical) Sunscreens
How they work: They sit on top of your skin and reflect or scatter UV rays.
Ingredients: Zinc Oxide, Titanium Dioxide
Pros: Great for sensitive, acne-prone, or reactive skin. Safe during pregnancy.
Cons: Older versions could feel thick or leave a white cast, but modern formulas have improved significantly
3. Combination Sunscreens
These mix both mineral and chemical filters to balance broad protection with a light, wearable feel.
A Note on "Sunscreen Doping"
Some sunscreens labeled as “100% mineral” actually include non-FDA-regulated chemical boosters in the full ingredient list. These aren’t listed as active ingredients but can still behave like chemical filters.
If you’re trying to avoid all chemical filters, scan the full ingredient and be on the lookout for:
- Butyloctyl salicylate (BOS)
- Ethyl ferulate
- Diethylhexyl syringylidenemalonate
- Tridecyl salicylate
- Octisalate (ethylhexyl salicylate)
- Octocrylene
- Homosalate
- Homosalate
Examples: ColorScience Flex and Blue Lizard Sensitive Mineral both contain butyloctyl salicylate.
How to Read Labels
- Natural or Organic: These are not FDA-regulated terms. “Natural” usually means mineral-based, while “organic” refers to the carbon-based structure of chemical filters.
- Reef-Safe: Generally means it avoids oxybenzone and octinoxate, which are harmful to marine life. Mineral formulas are the safest bet here.
- EWG Verified: The Environmental Working Group gives this mark to products that meet their criteria for safety and transparency. You can browse their recommended sunscreens at ewg.org.
My Sunscreen Picks
For Kids
For Oily Skin
For Sensitive Skin
- Vanicream Facial SPF 30
- Kinship Self Reflect SPF 32 (silicone-free)
Cosmetically Elegant (Looks Good Under Make-Up)
- Dermaquest Sheer Zinc (contains silicone)
Offers Light Make-up Like Coverage
- ColorScience Flex (contains BOS)
Water-Resistant Options
After Laser or For Long Sun Exposure
A Bonus Layer of Protection: From the Inside Out
One standout supplement is Polypodium leucotomos, a tropical fern extract rich in antioxidants. It helps reduce sunburn, inflammation, pigmentation, and UV-induced DNA damage. Clinical studies show it can increase your skin’s natural tolerance to the sun.
Heliocare is a well-known supplement that contains Polypodium leucotomos (marketed as Fernblock).
Final Thoughts
Choosing a sunscreen doesn’t have to be overwhelming. Focus on finding one that feels good, fits your skin type, and provides broad-spectrum protection with SPF 30 or higher. Reapply often, read your labels carefully, and consider supporting your skin from the inside out.
At The Derma Dietitian, we believe in protecting your skin through a comprehensive approach. Sun protection is one of the simplest, most powerful steps you can take toward lifelong skin health.
References
American Academy of Dermatology (AAD). “Sunscreen FAQs.” (Accessed May 2024). Provides recommendations on SPF 30+, broad-spectrum, water resistance, reapplication, and suitability for sensitive skin.
Mass General Brigham. “Preventing Skin Damage From UVA and UVB Rays.” (September 2023). Explains the difference between UVA (aging) and UVB (burning) rays and their roles in skin cancer.
U.S. Food and Drug Administration (FDA). “Sunscreen: How to Help Protect Your Skin from the Sun.” (Updated May 2021). Defines SPF and discusses labeling requirements.
Paula’s Choice. “What Does the PA+ Sunscreen Symbol Mean?” (Accessed May 2024). Explains the PA+ rating system for UVA protection.
U.S. Food and Drug Administration (FDA). “Questions and Answers: FDA announces new requirements for over-the-counter (OTC) sunscreen products marketed in the U.S.” (Updated May 2021). Details rules on water resistance and terms like “waterproof.”
Piedmont Healthcare. “The difference between physical and chemical sunscreen.” (April 2019). Explains the absorption mechanism of chemical sunscreens.
Matta, M. K., et al. “Effect of Sunscreen Application Under Maximal Use Conditions on Plasma Concentration of Sunscreen Active Ingredients: A Randomized Clinical Trial.” JAMA, 323(3), 256–267. (2020). One of the key FDA-led studies showing systemic absorption of chemical filters.
U.S. Food and Drug Administration (FDA). “Shedding More Light on Sunscreen Absorption.” (January 2020). Discusses the JAMA study findings and calls for more safety data.
U.S. Food and Drug Administration (FDA). “Sunscreen Drug Products for Over-the-Counter Use; Proposed Rule.” Federal Register, 84(38), 6204-6275. (February 2019). Outlines the proposed rule designating Zinc Oxide and Titanium Dioxide as GRASE and requesting more data for chemical filters.
Downs, C. A., et al. “Toxicopathological Effects of the Sunscreen UV Filter, Oxybenzone (Benzophenone-3), on Coral Planulae and Cultured Primary Cells and Its Environmental Contamination in Hawaii and the U.S. Virgin Islands.” Archives of Environmental Contamination and Toxicology, 70(2), 265–288. (2016). Key study linking oxybenzone to coral reef damage.
Cole, C., et al. “Metal oxide sunscreens protect skin by absorbing UV radiation.” Photodermatology, Photoimmunology & Photomedicine, 32(1), 5-10. (2016). Explains that mineral sunscreens primarily work via absorption, similar to chemical ones, with some scattering.
Stream2Sea. “Butyloctyl salicylate is NOT Reef Safe.” (Accessed May 2024). Discusses the use of Butyloctyl Salicylate as an ‘SPF booster’ and potential issues.
Marshfield Clinic Health System. “Sunscreen lingo: What’s in a label?” (July 2017). Clarifies the meaning of ‘organic’ and ‘natural’ on sunscreen labels.
REI Co-op. “What is Reef-Safe Sunscreen?” (April 2019). Defines ‘reef-safe’ as typically excluding oxybenzone and octinoxate.
Environmental Working Group (EWG). “About the guide | EWG’s Guide to Sunscreens.” (Accessed May 2024). Details the criteria for EWG Verified™ sunscreens.
Disclaimer
This post is intended for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any changes to your diet or treatment plan.
