Can You Get Vitamin D From the Sun in Winter?
Can you get vitamin D from the sun in winter? It depends on latitude. Clear winter sun often makes little to none from Boston north; near LA, a classic study still found midday production.
Read More
From the Bask team
Bask Blog
Insights on Vitamin D, sun health, and the science behind safe sun exposure
Does a Base Tan Protect You From Sunburn?
No. A base tan does not prevent sunburn. The Skin Cancer Foundation calls a tan evidence of DNA injury to your skin, not a sign of protection.
Read More
Can You Get Too Much Vitamin D From the Sun?
You cannot get vitamin D toxicity from sun exposure because your skin limits production. The real risks of too much sun are UV damage, sunburn, and skin cancer.
Read More
How Much Vitamin D Do You Actually Get in 15 Minutes of Sun?
There is no verified, universal IU answer for 15 minutes in the sun. The amount depends on UV conditions, skin pigmentation, exposed skin, season, and location.
Read More
Best Apps to Track Vitamin D in 2026: Dminder vs SunSafe vs Rays vs Sun Day vs Bask
Compare the best Vitamin D tracking apps in 2026: Dminder, SunSafe, Rays, and Sun Day, plus why Bask stands out with UV/weather forecasts, Apple Health daylight tracking, safe sun windows, supplements + cofactors, and physician-ready exports.
Read More
Why Is My Vitamin D Low Even Though I Get Sun?
Low vitamin D is possible even with daily sun. Morning walks, winter sun, shade, clothing, and darker skin can make outdoor time less productive than it looks.
Read More
• 7 min read
Can You Get Enough Vitamin D From Just Your Palms?
Sunlight on your palms can produce some vitamin D when enough UVB reaches them. Palms alone cover too little skin to reliably meet a vitamin D target.
Read More
The Angle of the Sun and Vitamin D: Why the Shadow Rule Works
When your shadow is shorter than your height, the sun is above roughly 45 degrees and useful UVB is more likely to reach your skin.
Read More
dminder Alternatives: Which Vitamin D App Is Right for You?
Compare dminder alternatives for vitamin D tracking, including Bask, Sunbeam, SunSafe, and UVLens, by features, price, platform, and privacy.
Read More
Vitamin D From Sun vs. Supplements: Which Is Better?
Both work and the molecule is the same: vitamin D3. Sun is free but unreliable in winter and for darker skin. Supplements are consistent year-round. The best approach for most people is both.
Read More
Morning Sunlight Benefits: Circadian Rhythm, Mood, and Energy (Beyond Vitamin D)
Morning sunlight sets your body's internal clock rather than making vitamin D. Getting bright daylight into your eyes within the first hour after waking helps lock your sleep cycle in place and sharpens daytime alertness.
Read More
The WFH Vitamin D Trap: Why Remote Workers Get Less Sun (and a 5-Minute Fix)
Working from home puts you at elevated risk of low vitamin D. Without a deliberate midday habit, remote workers get less sun than office commuters. The fix is a short, timed midday window you actually keep.
Read More
Does Sunlight Increase Testosterone? What the Research Actually Shows
A deep look at what controlled studies and large cohort analyses say about sunlight and testosterone in men.
Read More
Do Tanning Beds Give You Vitamin D?
Mostly no. Tanning beds emit mainly UVA, not the UVB your body needs to make vitamin D. The WHO classifies them as Group 1 carcinogens, same as tobacco. No health authority recommends tanning beds for vitamin D.
Read More
How Much Vitamin D Should I Take? D3 Dosage Guide (2026)
Stop guessing your D3 dose — here's what actually works. Evidence-based vitamin D3 dosage tiers, blood level targets, and cofactor tips for 2026.
Read More
How Much Vitamin D Should I Actually Take?
The official recommendation is 600 IU of vitamin D per day for most adults and 800 IU for anyone over 70. But the right dose depends on your blood level, sun exposure, body weight, and skin type.
Read More
• 7 min read
How Long to Sit in the Sun for Vitamin D: A Breakdown by Skin Type
The standard "15 minutes a day" advice was calibrated for fair skin. Here is how long people with light, medium, and dark skin actually need at different UV index levels, and why the gap matters.
Read More
Does Sunscreen Block Vitamin D? What the Research Actually Says
In theory sunscreen blocks vitamin D, since SPF 30 filters about 97% of UVB. In practice, people apply too little and miss spots, so studies consistently find regular sunscreen use does not cause deficiency.
Read More
Can You Get Vitamin D Through a Window?
No. Ordinary window glass blocks almost all UVB, the wavelength your skin needs to make vitamin D, so a sunny window does next to nothing for your levels, while still letting through skin-aging UVA.
Read More
Can You Get Vitamin D on a Cloudy Day?
Yes, you can still make some vitamin D on a cloudy day, but a lot less. Full overcast can cut UV reaching the ground to about a third, slashing your vitamin D production by roughly two-thirds.
Read More
The Best Time of Day to Get Vitamin D From the Sun
The best time to make vitamin D is the middle of the day, roughly 10am to 3pm and centered on solar noon, when the sun is highest and UVB is strongest. Morning and late-afternoon sun produce little to none.
Read More
What UV Index Do You Need to Make Vitamin D? (The Magic Number Is 3)
Your skin only makes vitamin D when the UV index hits 3 or higher, because below that the sun sits too low for UVB to reach the ground. Here is why 3 is the threshold and how to use it.
Read More
How Much Sun Do You Need for Vitamin D? A Real Answer With Real Numbers
Most people make enough vitamin D from 10-30 minutes of midday sun, but the real number depends on the UV index, your skin tone, how much skin is bare, and your latitude. Here is how to find yours.
Read More
Understanding Vitamin D Synthesis: The Science of Safe Sun Exposure
Learn how your skin produces Vitamin D from sunlight, the factors that influence synthesis, and how to optimize sun exposure safely based on scientific research.
Read More
What Is the Best UV Index for Tanning?
Find out the ideal UV index for tanning safely, how UV rays affect your skin, and why a tan is more than just a cosmetic change.
Read More