Yes — the human body really does emit light.
Not enough for you to see it with your eyes, and not in the mystical sense often suggested online. Human cells and tissues produce extremely faint emissions of photons known as ultra-weak photon emission (UPE), often called biophotons.
Researchers have measured and even photographed this light using highly sensitive equipment. That raises a fascinating question: why does a living human body produce light at all?
Can Scientists Actually See the Light From the Human Body?
With the right equipment, yes.
A 2009 study used an extremely sensitive cooled CCD camera to image ultra-weak light emitted from human bodies. The researchers reported that the intensity was roughly 1,000 times below the sensitivity of the naked eye.
So you cannot walk into a dark room, wait for your eyes to adjust and see yourself glowing. The emission is simply far too faint.
But sensitive scientific instruments can detect it.
What Are Biophotons?
Biophotons are photons emitted at extremely low intensity by living biological material. Scientists more commonly describe the phenomenon as ultra-weak photon emission.
Current research associates much of this emission with biochemical reactions involving cellular metabolism and oxidation. During these processes, molecules can enter electronically excited states and subsequently release photons as they return to a lower-energy state.
In simple terms: some of the chemistry of being alive produces tiny flashes of light.
For a broader introduction to the subject, see our main guide: Biophotons: The Hidden Light Emitted by Your Body & Food.
Does the Human Body Glow More at Certain Times?
This is where the research becomes particularly interesting.
In the human imaging study, photon emission changed during the day. It was relatively low in the morning, increased through the afternoon and peaked in the late afternoon before falling again.
The researchers also found that the pattern was different from the body’s surface-temperature pattern, suggesting that they were not simply photographing body heat.
They proposed that the daily variation may reflect changes in cellular metabolic processes associated with the body’s circadian rhythm.
Is This the Same as Body Heat?
No.
Humans emit infrared radiation because the body is warm, but ultra-weak photon emission is a different phenomenon. Research comparing photon images with thermal images has found different patterns.
That distinction matters. When researchers talk about biophotons, they are not simply giving a new name to ordinary body heat.
Does This Mean Humans Are “Beings of Light”?
That goes much further than the evidence.
The measurable fact is fascinating enough: living human tissue emits ultra-weak photons. Scientists are still investigating exactly what these emissions can tell us about biological activity and whether photons play roles beyond being products of biochemical reactions.
There are hypotheses about photon-mediated communication between cells, but this should not be presented as an established master communication system within the human body.
The distinction between what has been measured and what has been proposed is important if we want to understand biophotons rather than simply turn them into another health myth.
Do Our Cells Communicate Using Light?
Possibly — but this remains an active area of research rather than settled science.
Experiments have investigated whether light emitted by cells or cellular structures might influence neighbouring biological systems without direct chemical contact. Researchers continue to explore this possibility, but there is not yet a consensus that biophotons form a general communication network throughout the human body.
What is established is that the body’s cells operate through an extraordinarily complex combination of chemical, electrical and mechanical processes. You can explore that bigger picture in The Body’s Systems.
What Might Human Biophotons Tell Us?
Because ultra-weak photon emission is associated with metabolic and oxidative processes, researchers are investigating whether changes in these emissions could provide non-invasive information about what is happening within living tissues.
This does not mean biophoton imaging is currently a routine diagnostic test. It remains predominantly a research field.
But the possibility is intriguing: rather than cutting into tissue or taking a sample, extremely sensitive instruments may eventually help researchers observe aspects of biological activity through the tiny amount of light the tissue naturally emits.
What Does This Mean From a Natural Hygiene Perspective?
For Natural Body Intelligence, the most interesting part is not the temptation to turn biophotons into another substance that needs to be increased or supplemented.
It is another reminder of how dynamic living tissue really is.
Your cells are not static building blocks. They are continually carrying out metabolic reactions, exchanging signals, responding to their environment and adapting to changing demands.
That wider view sits at the heart of Natural Hygiene: creating favourable conditions for normal biological function rather than reducing health to one isolated substance or mechanism.
It also connects with the Law of Vital Economy, which looks at how the body allocates its available resources according to the demands being placed upon it.
Can You Increase the Light Your Body Emits?
This is not necessarily the right goal.
More photon emission does not automatically mean “more health”. Because ultra-weak photon emission is connected with oxidative and metabolic reactions, simply trying to maximise the number of photons would misunderstand what is being measured.
A more useful question is: what conditions support normal cellular function?
That brings us back to the wider foundations explored throughout Natural Body Intelligence: appropriate nourishment, sleep, rest, movement, daylight, hydration and reducing unnecessary physiological burden.
So, Do Humans Really Emit Light?
Yes.
The human body produces measurable ultra-weak photon emissions. They are far too faint for our eyes to detect, but specialised scientific instruments can measure and image them.
What makes the subject exciting is not exaggerating what those photons mean. It is recognising how much remains to be discovered about the activity taking place inside living cells.
The fact itself is remarkable enough:
You are emitting tiny quantities of light right now.
Explore Biophotons Further
- Biophotons: The Hidden Light Emitted by Your Body & Food
- What Is Natural Hygiene?
- Explore the Body’s Systems
- The Law of Vital Economy
Scientific Sources
- Mould RR, Mackenzie AM, Kalampouka I, et al. (2024). Ultra weak photon emission — a brief review.
- Kobayashi M, Kikuchi D, Okamura H. (2009). Imaging of Ultraweak Spontaneous Photon Emission from Human Body Displaying Diurnal Rhythm.