VitalSun Download Live better by the light
Practical, science-backed guides on using daylight for better sleep, energy, mood, and vitamin D. A new guide every day.
A Perfect Day of Light: When to Get Sun in the Morning, Midday, and Evening
A simple, science-backed schedule for using daylight across the day to improve sleep, energy, and mood, including how long you actually need at each point.
Read the guide →How Much Sun for Vitamin D? Minutes by Skin Type and UV Index
How many minutes of midday sun you need to make vitamin D, and how skin tone and the UV index change the number.
Sunlight & SunscreenSunscreen vs. Sunlight: Do You Really Have to Choose?
You can get the benefits of daylight and still protect your skin. Here is how to balance the two sensibly.
Sunlight & SleepWhy Morning Sunlight Helps You Sleep Better at Night
Bright light early in the day sets your body clock, which is what lets you feel sleepy at the right time that night.
Seasonal & TravelBeat Jet Lag With Light: A Time-Zone-by-Time-Zone Guide
Light is the fastest way to reset your body clock after travel. When to seek and avoid it depends on which way you flew.
Sunlight & the BodyCan Sunlight Lower Blood Pressure? The Nitric-Oxide Connection
Sunlight on skin releases nitric oxide, which relaxes blood vessels. Here is what the research does and does not show.
UV & Vitamin DWhat UV Index Is Safe for You? A Threshold Guide by Skin Type
The UV index tells you how fast you can burn. Here are practical thresholds by skin tone for getting sun safely.
Kids & Outdoor TimeHow Much Outdoor Time Do Kids Need to Protect Their Eyesight?
Time outdoors is linked to lower rates of nearsightedness in children. Here is how much the research points to.
Morning LightIs 10 Minutes of Morning Sun Enough? What Each Dose Does
For anchoring your body clock, a short bright dose goes a long way. Here is what 2, 10, and 30 minutes each do.
Sunlight & the BodySunlight and Mood: Daylight, Serotonin, Focus, and SAD
Daylight influences serotonin and the body clock, which is why light affects mood, focus, and seasonal low moods.
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