Sunlight is LifeBETA

Vitamin D Calculator

See how much vitamin D you can produce based on your location, skin type, and today's UV index.

Finding your location...

Body exposure

🛋️Lying down

Skin exposed: 29%

How Much Sun Do You Need for Vitamin D? The Complete GuideHow UV index, skin type, time of day, and location determine how much sun you actually need to make vitamin D, and when sunlight alone isn't enough.
Is sunlight better than vitamin D supplements?Sun on skin makes D3 plus sulfated D, nitric oxide and beta-endorphin; a capsule covers one pathway. When to use each, and how to dose from a 25(OH)D test.
Can you get vitamin D through a window?No. Window glass absorbs almost all UVB, the only band that makes vitamin D. What passes through is infrared and UVA, and what you need is open sky.