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Infrared sauna, cold plunge tub, and red light panel in a dark recovery room

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.

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The Research Brief

Wooden sauna bench with a bucket and ladle against cedar walls

How Hot Should a Sauna Really Be? Reading Past the Marketing Numbers

Wooden sauna bench with a bucket and ladle against cedar walls
Sauna

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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Silhouette of a person's neck and shoulder against a deep orange glow
Red Light Therapy

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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Wooden cube sauna with a glass front standing in a snowy forest
Buying Guide

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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Warm amber-lit wooden sauna cabin interior with tiered benches
Buying Guide

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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Wood-paneled room with a single line of light along the ceiling edge
Sauna

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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Round barrel sauna exterior with porthole window in an open field
Buying Guide

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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Sauna heater stones with water being poured over them
Protocol

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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Red LED bokeh macro of a red light therapy panel, out of focus
Red Light Therapy

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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Traditional Finnish-style sauna interior with wood benches and steam
Sauna

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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Frosted cold plunge tub with still water outdoors
Cold Plunge

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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A dark barrel sauna interior with low LED lighting and a stone heater
Protocol

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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A stone-filled sauna heater and wooden bucket in a dark sauna
Sauna

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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