Can you get vitamin D through a glass window?

Vitamin D doesn't actually come from sunlight- it isn't transmitted by it. <br>Vitamin D is synthesized (produced) inside of our skins from higher energy light (like UV light).<br><br> The only thing that comes from sunlight is that UV light- our bodies do the rest. <br>UV light can pass through glass and water, but depending on the type of glass and the depth of the water, a large amount of it can be reflected away or absorbed by the material before it touched your skin. <br><br>If you lived under UV reflective glass (many kinds of glass are made with special coatings, or certain substances in them to do this), then your body wouldn't be able to produce as much vitamin D as from direct sunlight. The average pane of glass isn't going to interfere very much, though, if you get enough sunlight through it. Regardless, actually going outside is better. <br><br>Most people in the modern world spend a large amount of time inside, and this can lead to vitamin D deficiency if they don't get any Vitamin D in their diets or through taking vitamins (this is another way to get vitamin D, instead of making it in one's skin). <br>Whether one can produce enough vitamin D or not depends on how pale the skin is (a tan protects against UV, but it's a double edged sWord- it can prevent cancer, but also prevent production of vitamin D), how much skin is exposed (how much clothing one is wearing), and how long one spends in the sunlight.