Dermatologists say it constantly: sunscreen is the best anti-aging product you can buy. That can sound like a slogan, but it rests on one of the only long-term randomized trials in the whole field of skin aging.
Written by Vita Globe Editorial Team | Reviewed against American Academy of Dermatology guidance and peer-reviewed research
Does sunscreen really prevent wrinkles?
Yes. In a randomized trial of 903 adults under 55, those assigned to daily sunscreen showed 24% less skin aging over 4.5 years than those who used it only when they chose to[1]. That matters because UV exposure appears responsible for about 80% of visible facial aging signs[2]. UV speeds up the breakdown of collagen in skin[3].
Caveat: Sunscreen only works if you use it properly. Using too little, skipping reapplication or using an expired product makes it much less effective[4].
Sources: Hughes 2013 (RCT) · Flament 2013 · Fisher 2002 · Verified 2026-09-28
In this article
What did the big sunscreen trial find?
The Nambour trial in Queensland, Australia randomly assigned 903 adults younger than 55 to either apply broad-spectrum sunscreen every morning (and after sweating or bathing) or keep using sunscreen however they normally did. Researchers measured skin aging on the back of the hand using silicone skin casts[1].
After 4.5 years, the daily sunscreen group had 24% less skin aging than the discretionary group, and showed no detectable increase in skin aging over the study at all[1]. The same trial found no overall benefit from beta-carotene supplements[1].
The authors concluded that regular sunscreen use slows skin aging in healthy middle-aged men and women[1]. For a field full of small, short studies, that is unusually strong evidence.
How does the sun age your skin?
Dermatologists call sun-driven aging photoaging. UV rays trigger enzymes in the skin that break down collagen, and the repair process is imperfect, so damage builds up with each exposure[3]. Over years, this shows up as wrinkles, rough texture, loss of firmness and spots.
How much of visible aging is sun? In a study of 298 women aged 30 to 78, comparing sun-seekers with sun-avoiders, UV exposure appeared responsible for about 80% of visible facial aging signs. Pigment spots were most tied to sun, while wrinkles were driven by both sun and time[2].
Tanning is part of the same process. The AAD notes that every tan prematurely ages your skin[6].
How much sunscreen should you use, and how often?
The American Academy of Dermatology's guidance[4]:
- Choose broad-spectrum (UVA and UVB), SPF 30 or higher, water-resistant sunscreen.
- Use about 1 ounce, roughly a shot glass, to cover the body, and at least a teaspoon for the face.
- Apply about 15 minutes before going outside.
- Reapply every two hours, and right after swimming or sweating.
- Wear it on cloudy days and in winter too, because UV gets through clouds.
Shade, hats and sun-protective clothing do a lot of the heavy lifting too[6].
Do you need sunscreen if you are mostly indoors?
The trial above asked people to apply sunscreen every morning, not just on beach days, and that daily habit is what made the difference[1]. Short, everyday exposures like walking to the car or school pickup add up over the years.
The simplest approach is to make sunscreen part of your morning routine, like brushing your teeth. The AAD calls sunscreen and moisturizer the two most effective anti-aging products[5], so a moisturizer with broad-spectrum SPF 30 is a reasonable single step for a mostly indoor day.
Can food help? A bit, possibly, but not instead of sunscreen. See whether food can help protect your skin from the sun.
Is it too late to start?
No. The Nambour trial enrolled adults up to age 55, many of whom had decades of sun exposure behind them, and the daily group still showed a benefit[1]. You cannot undo all past damage, but you can stop adding to it. Curious whether collagen supplements add anything on top? See the collagen skin trials.
The honest summary
- A 4.5-year randomized trial found daily sunscreen slowed visible skin aging[1].
- UV appears responsible for most visible facial aging[2].
- UV speeds up collagen breakdown[3].
- Use enough, reapply, and wear it every day[4].
Our option
Vita Globe Radiant Skin Bundle
Nothing you take by mouth replaces sunscreen. If you already protect your skin every day and want a simple inside-out ritual too, this is our option. The Radiant Skin Bundle pairs our Hydrolyzed Collagen Gummies with our Biotin 5,000mcg Gummies (5,000mcg of biotin per two-gummy serving). Suggested use is two collagen gummies and two biotin gummies daily. Both are gluten-free and non-GMO, and every product in the bundle is tested by an independent third-party lab.
Frequently asked questions
What SPF is best for preventing wrinkles?
The AAD recommends broad-spectrum SPF 30 or higher[4]. Applying enough and reapplying matters more than chasing a very high number.
Do I need sunscreen on cloudy days?
Yes. UV rays pass through clouds, and the AAD recommends sunscreen year-round[4].
Can sunscreen reverse existing wrinkles?
Sunscreen mainly prevents new damage. In the Nambour trial, the daily group showed no detectable increase in aging over 4.5 years[1]. For existing lines, see our post on skin in your 40s.
Does makeup with SPF count?
Only if you apply enough, which is hard with makeup. Using too little sunscreen reduces protection[4], so a dedicated sunscreen underneath is the safer choice.
How much of skin aging is caused by the sun?
One study of 298 women estimated UV exposure is responsible for about 80% of visible facial aging signs[2].
Sources
- Hughes MCB, Williams GM, Baker P, Green AC. Sunscreen and prevention of skin aging: a randomized trial. Ann Intern Med. 2013;158(11):781-790. doi:10.7326/0003-4819-158-11-201306040-00002
- Flament F, Bazin R, Laquieze S, Rubert V, Simonpietri E, Piot B. Effect of the sun on visible clinical signs of aging in Caucasian skin. Clin Cosmet Investig Dermatol. 2013;6:221-232. doi:10.2147/CCID.S44686
- Fisher GJ, Kang S, Varani J, et al. Mechanisms of photoaging and chronological skin aging. Arch Dermatol. 2002;138(11):1462-1470. doi:10.1001/archderm.138.11.1462
- American Academy of Dermatology Association. How to apply sunscreen. www.aad.org/public/everyday-care/sun-protection/shade-clothing-sunscreen/how-to-apply-sunscreen
- American Academy of Dermatology Association. How to select anti-aging skin care products. www.aad.org/public/skin-hair-nails/anti-aging-skin-care
- American Academy of Dermatology Association. 11 ways to reduce premature skin aging. www.aad.org/public/everyday-care/skin-care-secrets/anti-aging/reduce-premature-aging-skin
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or caring for a child.
