Fact checked by Nick Blackmer
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- Moderate sun exposure helps your body produce vitamin D, but you don’t need much to see benefits.
- There’s no “perfect” amount, as needs vary based on factors like skin tone, location, and time of year.
- Too much sun—especially enough to tan or burn—can damage your skin and increase the risk of premature aging and skin cancer.
Sunshine is essential to your health, helping lift your mood, produce vitamin D, and regulate your sleep schedule—but too much sun can harm your skin. So how much sun exposure is actually good for you, and when does it become a risk?
How Much Sun Exposure Is Beneficial?
The main health benefit of sunshine is vitamin D, which supports strong bones, immune health, and overall wellness. When ultraviolet (UV) rays from sunlight strike your skin, it triggers vitamin D production in your body. Research shows that for most people, about 5–30 minutes of sun on the arms and legs a few times per week will generate enough vitamin D.
“You do not need to sunbathe to get adequate amounts of vitamin D,” Joshua Zeichner, MD, FAAD, a dermatologist at Mount Sinai in New York, told Health. And sunscreen won’t hinder your vitamin D—studies show production only slightly decreases in people wearing sunscreen.
However, “there isn’t a single ‘perfect’ amount of sun exposure that applies to everyone,” Hope Mitchell, MD, FAAD, a board-certified dermatologist at Mitchell Dermatology in Ohio, told Health.
Vitamin D production from sunlight varies depending on your skin tone, location, the season, and the time of day. People with deeper skin tones, for example, have more melanin, which can reduce the skin's ability to produce vitamin D from sunlight—meaning they may need longer periods of sun exposure.
When Sun Exposure Becomes Harmful
While some experts say limited sun exposure can be beneficial, others take a more prudent stance: The American Academy of Dermatology says there is no completely safe level of UV exposure, recommending people get adequate vitamin D through food and supplements instead.
Experts agree, however, that sun exposure becomes harmful when it’s intense enough to cause tanning or burning, Shamsa Kanwal, MD, a board-certified dermatologist at MyPsoriasisTeam, told Health. From a dermatology perspective, there’s no such thing as a “healthy tan”—it’s a visible sign of UV injury, she said.
Factors like the UV index, time of day, and how long you’re outside also influence your risk of skin damage. A UV index of three or higher means you should protect your skin, especially if you’ll be in direct sun or outside for long periods during peak sun hours, Mitchell said. “Even on cloudy days, UV rays can still penetrate and harm the skin,” she added.
Over time, unprotected sun exposure can increase the risk of premature aging and skin cancer. The earliest sign of damage is a sunburn, which causes skin redness, tightness, and pain, Kanwal said. Severe sunburns can cause sun poisoning, with symptoms like fever, nausea, and fatigue, which require medical attention.
Other early signs of skin damage from the sun include premature wrinkles, dark spots (aka sun spots), and broken capillaries, which are damaged blood vessels just under your skin, sometimes called spider veins. Zeichner also noted that abnormal scabs, discolored moles, or pearly colored bumps can be early signs of skin cancer.
How To Protect Your Skin in the Sun
It’s still possible to enjoy being outside while protecting your skin. Here’s what dermatologists recommend:
- Wear a broad-spectrum sunscreen with SPF 30 or higher every day. Reapply every two hours when outside, or sooner if you’ve been sweating or swimming. Kanwal recommends applying at least 1 ounce of sunscreen to your body and 1 teaspoon to your face.
- Wear UV-protective clothing, like wide-brimmed hats and UV-blocking sunglasses. UPF clothing, engineered to block harmful rays, is also a great option if you'll be outside for extended periods, Mitchell said.
- Get in the shade as much as possible, especially if you’re out during peak sun hours. If you’re at the beach, sit under a tent or umbrella to add another layer of protection.
Sunscreen alone is often not enough to protect your skin from harmful UV rays. Your best bet for preventing long-term damage is a combination of daily sunscreen use (even on cloudy days) and additional precautions, like seeking shade and wearing layers. And remember to get regular skin checks with your primary care doctor or dermatologist, especially if you have a family history of skin cancer.
