By the way, monochromatic visible red light has been proven to enhance dermal regeneration, but that's a separate topic than intracellular photosynthetic production of melatonin by the mitochondria.

Well, obviously. 😅 This is a rabbit hole I've been aware of (from the wife) but I haven't gone down. Your responses were a great introduction, ty.

I know, I was sceptical of the idea since I first heard of it 25 years ago. Only recently have I seen credible information on its benefits.