2 ms·Sunrise and sunset great and very safe times for sun exposure.by swader999 5y agoSunrise and sunset great and very safe times for sun exposure.willmw101 5y agoNeither offer any vitamin D benefit in most geographies though.swader999 5y agoTrue but those wavelengths will maintain your circadian rhythm if you time it correctly. See the Huberman podcast on this: https://youtu.be/nm1TxQj9IsQ https://youtu.be/nm1TxQj9IsQ