Biohacker Bryan Johnson sounds alarm on UV rays: 'Sun can damage skin indoors too'; shares protection protocol for youthful skin
Bryan Johnson, known for his anti-aging pursuits, is now cautioning about the dangers of indoor sun exposure. He highlights that UV rays can penetrate windows and harm skin even on cloudy days. Johnson advises monitoring UV levels, using UV-tinted windows, and limiting sun exposure to protect against premature aging and skin damage, urging a reevaluation of sun safety measures.
Agencies Bryan Johnson warns about indoor sun damage. He shares his UV protection routine. UVA and UVB rays cause aging and skin cancer. Glass windows offer limited protection. Indoor exposure contributes to cumulative sun damage. Johnson uses UV-tinted windows and umbrellas. On a cloudy day or even behind glass walls, most of us assume we're safe from the sun's wrath. But tech entrepreneur and biohacking icon Bryan Johnson has a different take. Known for his ambitious anti-aging experiment Blueprint and extreme longevity routines—from plasma transfusions to methylene blue therapy—Johnson is now raising an alarm on a less headline-grabbing but deeply pervasive issue: sun damage indoors.Taking to X (formerly Twitter), Johnson cautioned that ultraviolet (UV) rays from the sun can harm your skin even on overcast days or through windows. 'The sun can damage your skin even on cloudy days and indoors through windows,' he wrote, before sharing his own daily protocol to minimize exposure.'Check UV levels before exposing your skin,' he advised in a recent post. 0–2: safe
3–5: protect your skin and limit exposure
6+: best to protect or avoid His routine includes: Sunlight only before 10am and after 4pm
UV-tinted windows that block 99% of rays
A UV umbrella during high UV periods — bryan_johnson (@bryan_johnson) Johnson, 47, is no stranger to extreme wellness routines. He reportedly spends over $2 million annually on reversing aging, tracking every molecule in his body in hopes of slowing down time. Recently, he made headlines after revealing his urine turned blue from ingesting methylene blue, a compound believed by some in the biohacking community to boost mitochondrial function and cognitive health.
But his warning about UV exposure marks a pivot from complex internal therapies to simple, surface-level protection—a reminder that even basic environmental exposures can accelerate aging.According to Johns Hopkins Medicine, UVA and UVB rays from the sun are responsible for premature aging, skin cancer, and eye damage. Even common household light bulbs, tanning beds, and nail dryers emit UV radiation. While UVC rays are filtered by the Earth's atmosphere, the remaining UV spectrum still packs a punch.'Melanin offers limited protection,' an article on Johns Hopkins notes. 'When the amount of UV rays exceeds the skin's natural defenses, sunburn and long-term damage occur—even indoors.'So why is this revelation significant? Most people don't wear sunscreen inside their homes or offices, let alone think twice about sitting by a sunny window. But the Cleveland Clinic confirms that UV rays can penetrate standard glass, causing elastin breakdown, which leads to sagging, wrinkling, and even actinic keratosis, a precancerous skin condition.
Moreover, frequent indoor exposure still contributes to cumulative sun damage, which, over time, increases the risk of skin cancers like basal cell carcinoma and squamous cell carcinoma. Those with lighter skin, freckles, and red or blond hair are at higher risk, but no skin tone is immune.Even more alarming, prolonged UV exposure can lead to vision problems like cataracts, something often overlooked in daily indoor habits.Johnson's emphasis on UV-index monitoring and structural interventions like tinted windows shows how technology can work alongside biology to reduce harm. While most of his biohacks, from IHHT (Intermittent Hypoxia-Hyperoxia Training) to gene expression tracking, seem far removed from everyday life, this particular protocol is surprisingly practical and actionable.His warning may sound extreme, but data backs his claims. According to the FDA and the Cleveland Clinic, UV exposure, even when indirect, affects your skin's DNA, potentially triggering uncontrolled cell growth—a.k.a. cancer. What's worse, sun damage is often invisible until it's too late.'Skin damage doesn't show when you're young,' the Cleveland Clinic warns. 'It appears later in life—and by then, prevention is no longer an option, only correction.'Whether you see Bryan Johnson as a visionary or a walking science experiment, his protocols open up a larger public health conversation. Are we too casual about sun exposure? Are we unknowingly speeding up the very aging process we spend fortunes trying to reverse?As Johnson himself puts it, it's not just about living longer—it's about living smarter.So next time you skip sunscreen on a cloudy day or soak up filtered rays behind a windowpane, consider this: your skin still sees the sun, even when you don't. And if the world's most extreme anti-ager is hiding from indoor UV rays, maybe it's time to rethink what 'sun safety' really means.
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