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Proudly crafted in the USA with ultra-premium ingredients you can trust.
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No hassle 30 day returns on unopened packages.
Produced in a FDA-registered, GMP-certified facility for purity and safety.
Seven formulas across one fasting day. The letters name the moment. The number counts the gates it clears.
Flavor & sensory
Low sweetness, clean mineral citrus — it drinks like something a health-literate adult reaches for, not a sports-drink. Two ways to take it.
The flagship — spa-water cooling, the salt read as refreshment. Fast-safe: won't break your fast.
Unflavored, nothing added — the genuine clean-fast option for a strict window.
The all-day sip
Minerals lost slowly are best replaced slowly. One stick in 750 ml–1 litre, sipped through your window, keeps levels steady instead of spiking and dipping. It's the difference between coasting through a fast and white-knuckling it.
The forms
Trace uses citrate-buffered minerals and a cellular-hydration osmolyte: forms chosen to be gentle on the stomach and smooth to drink through a fast, not the salt-heavy chemistry most mixes lean on.*
The lead electrolyte, what a fast flushes first.
Citrate-buffered
Redmond Real Salt® + sodium citrate: smoother than a salt-heavy mix.
Holds fluid balance and normal muscle function.
Citrate-buffered
Potassium citrate: a gentle, easy-drinking form.
Supports normal nerve and muscle function.
Citrate-buffered
Magnesium citrate: the form that is easy on the stomach.
Cellular hydration, the part salt-only formulas miss.
The osmolyte
BetaPower® trimethylglycine: an osmolyte that supports cellular fluid balance.*
It isn't hunger, and it isn't ordinary dehydration. When you fast, insulin falls, and as it drops your kidneys flush sodium and water, with potassium and magnesium close behind. That mineral gap is the wall most fasters hit: the headache, the fatigue, the fog, the cramps people call the fasting flu.
The Metabolic Stack
Two products, one routine. Core, capsules with your morning water, steadies cravings and clarity. Trace, in your bottle, handles hydration through the window. Together, your daily fasting practice.
Fasting is a stressor, and cortisol tends to climb as the hours add up. SHR-5 Rhodiola is the adaptogen that acts like a thermostat, supporting a healthy stress response so the climb is gentler.
Illustrative of the mechanism, not a measured clinical outcome.
One capsule system. A benefit for every stretch of the fasting day.
Your last meal winds down and insulin begins to fall, starting the shift away from sugar for fuel.
Educational visualization of fasting phases and ingredient roles.
Every one of Core's six actives earns its place — but two go further than the rest. Satiereal® saffron and SHR-5 Rhodiola are the exact standardized extracts behind published, placebo-controlled human trials.
176mg
Core's saffron dose — the exact amount used in the trial.
In a randomized, double-blind, placebo-controlled study, 176 mg of Satiereal® a day significantly reduced snacking and between-meal eating versus placebo — the part of fasting that breaks most people.
Gout et al., 2010, Nutrition Research
5trials
Placebo-controlled human studies on stress, fatigue & focus.
SHR-5 is the exact standardized Rhodiola rosea extract used in those trials — shown to reduce stress-related fatigue and the cortisol spike that comes with it, while supporting concentration.
In Core, SHR-5 is the same authenticated extract from those studies, dosed at 200 mg — within the range used in the trials.
Darbinyan et al., 2000 · Olsson et al., 2009, Planta Med · reviewed in Ivanova Stojcheva & Quintela, 2022, Molecules
Statements describe published research on these individual ingredients, not on the finished product. Individual results vary. This product is not intended to diagnose, treat, cure, or prevent any disease.
Built around standardized extracts with published human trials — and dosed to do real work.
Sharp, calm focus that holds up under the stress of a fast.
The amino acid your brain uses to make dopamine and noradrenaline — the chemistry behind focus and drive under stress. Absorbed best on an empty stomach, so a fast is its ideal window.
Promotes alpha-wave activity for calm focus, and smooths the jitters from your morning coffee.
The standardized Rhodiola rosea extract studied in human trials on stress, fatigue, and mental performance.
Fewer cravings, steadier energy, and stable blood sugar while you fast.
A standardized saffron extract shown in a placebo-controlled trial to curb snacking and between-meal cravings — the hardest part of a fast.
High-potency vitamin B1, an essential cofactor for turning fuel into cellular energy.
A trace mineral that supports insulin sensitivity, smoothing the blood-sugar dips that read as hunger.
Statements describe published research on these individual ingredients, not on the finished product. Individual results vary. This product is not intended to diagnose, treat, cure, or prevent any disease.
Core combines six active ingredients — anchored by clinically studied Satiereal® saffron and SHR-5 Rhodiola — in two complexes made for the cravings, the slump, and the stress that test a fast. See how it compares.
A dash means partial or occasional support — not a targeted dose. Comparison reflects typical use in each category; specific products and habits vary.
The people behind it
Kētos was founded in 2023 by New York City fasters, metabolic-health enthusiasts, and performance-focused builders. We formulate alongside researchers and formulators in metabolic science.
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Founder
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