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”
Full spectrum sunlight
Full spectrum sunlight is essential for circadian and mitochondrial health.
Strong consensusFor circadian health and sunlight exposure.
The strongest voice
“the body has opto optimized over billions of years to you take advantage of this spike in the near infr in the infrared portion of the spectrum”
In their own words
One faithful sentence per source, linked to the moment it was said; quiet chips mark where money is involved.
a molecular biology PhD recommend
“Full spectrum sunlight including near infrared and infrared is important for mitochondrial ATP production and overall metabolic health, and getting outside provides this natural exposure.”
a molecular biology PhD · source video · 00:56:00
a Princeton-trained molecular biology PhD recommend
“full spectrum light supports mitochondrial health and nitric oxide production”
a Princeton-trained molecular biology PhD · source video · 00:52:00
an optometrist of twenty years recommend
“Modern life filters out NIR, which is necessary for retinal and mitochondrial health.”
an optometrist of twenty years · Instagram post
an optometrist of twenty years recommend
“Full spectrum sunlight contains red and infrared light which balances the inflammation caused by blue light.”
an optometrist of twenty years · Instagram reel · 00:00:40
an optometrist of twenty years recommend
“Full spectrum sunlight exposure to the eyes and skin is essential for setting the body's circadian clocks via neuropsin signaling.”
an optometrist of twenty years · Instagram reel
an optometrist of twenty years recommend
“Full spectrum sunlight through naked eyes is crucial for health and proper circadian signaling.”
an optometrist of twenty years · Instagram reel
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.”