Natural light exposure
Natural light exposure is essential for healthy circadian rhythms and mood.
Strong consensus“it's really teaching us how critical it is to get outdoors and exposed to light like you are right now”
Natural sun exposure
Natural sunlight is strongly supported for circadian health and mitochondrial function.
Strong consensusFor circadian biology and light exposure.
The strongest voice
“if we could get them in the working from home and could we get them working outside so they're at least getting natural light on themselves to protect their muscle”
In their own words
One faithful sentence per source, linked to the moment it was said; quiet chips mark where money is involved.
a Princeton-trained molecular biology PhD recommend
“Sunlight provides essential infrared light that energizes structured water in the body, supporting vascular health and mitochondrial function.”
a Princeton-trained molecular biology PhD · source video · 00:48:30
a board-certified cardiologist recommend
“UVA sunlight hitting the skin liberates nitric oxide from artery walls which helps reduce plaque deposits and improve endothelial function”
a board-certified cardiologist · source video · 00:05:30
Worth discussing with your GP, especially if you take medication or are pregnant. Entrain describes what is publicly taught; it does not prescribe.
More from light and sun
Outdoor time
Spending time outdoors supports circadian rhythms, resilience, and mental well-being.
Strong consensus“when you spend extended time in the back country, say camping, like under the stars or in a tent, and we're disconnected from technology, I think it takes three three nights, three nights or four nights, and when you come back, your brain has actually reset and it's become a sponge again.”
Incandescent bulb
Incandescent bulbs are a gentle, low-blue light option for home lighting, supporting circadian health.
Strong consensus“Anywho, I buy all my incandescent bulbs from a specialist lighting shop they are the best.”