Learn
Cold, Heat & Light. Explained.
What the human studies actually show, what they do not, and the protocols people use in practice. Every claim is tiered, every source is linked, and nothing here is medical advice.
Cold water immersion
Cooling, vasoconstriction and norepinephrine — the mechanisms, what human studies show versus what they do not, dosing used in practice, and how to do it safely.
Sauna heat
The Finnish observational cohorts, heat shock proteins and cardiovascular conditioning — plus an honest look at infrared vs traditional.
Red light
Photobiomodulation and cytochrome c oxidase, the 480–1,060 nm wavelength map, and why every irradiance figure needs a source label.
How we grade evidence
Studied in humans
Human trials or large observational cohorts exist. We say what they measured and what they did not.
Early or mixed evidence
Small studies, animal or in-vitro work. Interesting, labelled as such, never presented as settled.
Not established
Claims you will see elsewhere that the literature does not support. We name them and skip them.
Protocol guides are included with the equipment — temperature, time, frequency. The part most stores skip. Nothing in this section is medical advice; talk to a qualified professional about your own situation.
From reading to choosing
The science pages end with what it means for choosing — then pick the set that fits.