THE RESEARCH BRIEF
The research behind heat, cold, and light.
Each protocol, examined session by session against the published studies behind it. What the research shows, what it does not, and how to read the difference.
The Research Brief

How Hot Should a Sauna Really Be? Reading Past the Marketing Numbers
A listed maximum is a ceiling, not a setting. Where the sensor sits, the kind of heat, humidity, and session length decide what you actually experience.
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Near-Infrared vs. Far-Infrared: Two Bands, and What a Spec Sheet Leaves Out
Red light panels and infrared saunas both say infrared. They are different bands from different emitters. Three questions sort any listing.
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Indoor or Outdoor Sauna: Which One Actually Fits Your Home?
Indoor infrared, indoor traditional, or an outdoor cube: what each one needs in power, floor, and upkeep, with real numbers from our catalog.
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How to Choose an Infrared Sauna for Home Use: What Actually Matters
Seven items decide whether an infrared cabin fits your home, your circuit, and your routine: heater type, wattage, size, certification, EMF, build, and delivery terms.
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Low EMF, Safe EMF: What the Words on a Sauna Listing Actually Mean
Nearly every infrared sauna says low EMF. Here is what EMF is, which fields matter in a cabin, how to read the numbers, and what the research does and does not show.
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Is the More Expensive Sauna Better, or Just Bigger?
A worked comparison of a $1,479 and a $3,834 infrared sauna: what the price gap actually buys, what it doesn't, and the questions worth asking before you spend more.
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Same Three Inputs, Four Sequences: How the Four Protocols Actually Differ
All four Peak Regenerate protocols run on the same three inputs. What changes is entirely when cold and heat enter the sequence, tier by tier.
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660nm vs. 850nm: What the Two Numbers on a Red Light Panel Actually Mean
660nm and 850nm are the two wavelength numbers that matter on a red light panel. What they tell you, and what they don't, about how a panel actually performs.
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Infrared vs. Traditional Sauna: Two Appliances That Heat You Two Different Ways
Traditional and infrared saunas heat you by different mechanisms, and most of the cited cardiovascular and dementia research was done in traditional saunas only. What actually differs between the t...
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Cold Isn't a Flex: What the Adaptation Research Actually Rewards
The stress-hormone numbers people quote about cold plunging were measured under a one-hour, 14°C condition, not a 3-minute home plunge. What the adaptation research actually rewards is repeated, co...
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Heat, Cold, and Light Together: How the Full Protocol Works
Most research studies one input at a time. This covers sequencing: what order to add heat, cold, and light in, and how to time them within a day and a week.
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Traditional Sauna: The Format the Research Was Actually Done In
The Finnish cohort studies people cite were done in traditional saunas. What a traditional sauna is, how those studies were built, and how to read an observational study.
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