It's worth noting that despite not providing Vitamin D, there's still a fair bit of value in getting sunlight through glass:
1. Seasonal Affective Disorder is treated using just the visible light spectrum entering the retinas of the eyes [1], and there are a ton of studies showing its effectiveness (in fact, most SAD lamps explicitly filter out ultraviolet light).
2. Some infrared passes through some glass and seems to be good for a thousand different things. [2] [3]
3. UVA passes through glass and has beneficial effects on the cardiovascular system. [4]
1. Seasonal Affective Disorder is treated using just the visible light spectrum entering the retinas of the eyes [1], and there are a ton of studies showing its effectiveness (in fact, most SAD lamps explicitly filter out ultraviolet light).
2. Some infrared passes through some glass and seems to be good for a thousand different things. [2] [3]
3. UVA passes through glass and has beneficial effects on the cardiovascular system. [4]
[1] https://www.sciencedirect.com/science/article/pii/0273230092...
[2] https://valtsus.blogspot.com/2017/05/the-therapeutic-effects...
[3] https://www.quora.com/Can-infrared-light-pass-through-glass
[4] https://www.sciencedirect.com/science/article/pii/S0022202X1...