Full spectrum sunlight
For circadian health and sunlight exposure
The experts we follow agree on this.
Full spectrum sunlight is essential for circadian and mitochondrial health.
Who is behind it
Voices including a molecular biology PhD, a Princeton-trained molecular biology PhD and an optometrist of twenty years.
How strong the research is
Mostly expert experience so far, with published research still catching up.
In their words
“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”
a Princeton-trained molecular biology PhD
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.
full spectrum light supports mitochondrial health and nitric oxide production
Modern life filters out NIR, which is necessary for retinal and mitochondrial health.
Full spectrum sunlight contains red and infrared light which balances the inflammation caused by blue light.
Full spectrum sunlight exposure to the eyes and skin is essential for setting the body's circadian clocks via neuropsin signaling.
Full spectrum sunlight through naked eyes is crucial for health and proper circadian signaling.
Safe, full-spectrum light, even when imperfect, is powerful and beneficial compared to artificial lighting.
Sunlight controls our physiology and we are designed to be in sync with natural light cycles through our eyes and skin
The retina depends on full spectrum natural light to function and repair itself daily.
Talk it through
Entrain shows what the experts teach, so you can make better decisions with your own clinician. It does not diagnose or prescribe. If something is worrying you, start there.
How this reading was made
Every line here comes from a doctor, scientist or coach speaking publicly, and links to the moment they said it. Entrain listens for where independent experts arrive at the same place on their own, and shows where they part ways. Mostly expert experience so far, with published research still catching up.
None of the statements here come with a declared commercial interest. Last refreshed 23 September 2026.
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Keep exploring light and environment
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Red light exposure
Red light exposure supports skin and mitochondrial health, and helps prepare the body for sun exposure.
The experts agree
Midday sunlight exposure
Midday sunlight supports vitamin D, hormone balance, and mitochondrial health, making it a valuable daily habit.
The experts agree
Water
Staying hydrated with water is a simple, universal foundation for health.
The experts agree
Sunlight
Regular sunlight exposure supports vitamin D, thyroid, and healthy circadian rhythms.
The experts agree
Near-infrared light therapy
Near-infrared light therapy supports mitochondrial health and gentle recovery.
The experts agree
Circadian glasses
Circadian glasses help protect your rhythm from disruptive artificial light.