Frequently Asked Questions

Discover the answers to your frequently asked questions about our products and services.

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CORE is designed to be fasting-compatible. It contains no sugar, no added calories, and no protein/fat/carbs, just active micronutrients and botanical extracts in a vegetarian capsule.

Fasting creates a unique metabolic environment that generic multivitamins aren't designed to support.

  • The Diuretic Shift: As your insulin drops, your body flushes out water and essential electrolytes rapidly. CORE replenishes Potassium and Magnesium to help prevent the headaches and muscle cramps associated with this flush.
  • Metabolic Demands: Converting fat into fuel requires specific cofactors. We include high-potency Thiamine (Vitamin B1) to support mitochondrial energy production efficiently during this transition.
  • Stress & Hunger: Fasting is a form of stress. Unlike standard vitamins, CORE includes a Metabolic and Cognition Complex featuring Rhodiola and Saffron. These targeted adaptogens help regulate healthy stress response and manage cravings, keeping you supported where willpower alone can fail.

CORE is built as two complementary stacks designed to optimize the fasted state:

Metabolic Complex

Designed to fuel the cellular machinery of fasting and manage the body's physical needs.

Magnesium
This one of the central biohacks for energy. Malate acts as a spark plug in the Krebs Cycle, which is responsible for ATP energy production. Magnesium enhances muscle function and cellular energy, so you can feel your best throughout your fast.

Potassium
Fasting is a natural diuretic state, meaning the body flushes water and electrolytes rapidly. Potassium Citrate is highly bioavailable and alkalizing. It optimizes intracellular hydration and buffers acidity, which can help prevent the muscle cramps and heaviness that can affect the early stages of a fast.

Thiamine
We include Thiamine at high potency because it acts as the essential cofactor for metabolic flexibility. Thiamine supports enzymes that allow your body to shift gears from burning sugar to burning fat. The aim here is for Thiamine to promote an energized transition into ketosis and more easily obtain peak mental clarity.

Organic Saffron Extract (Affron®)
A premium, clinically studied extract that aims to target the psychological friction of fasting. Saffron modulates neurotransmitters like serotonin to improve mood and regulate satiety. It helps reduce snacking cravings, making it easier to successfully complete to your fast.

Chromium
Hunger pangs are often just blood sugar fluctuations in disguise. Chromium supports insulin sensitivity and healthy glucose metabolism. By stabilizing these levels, it helps flatten the peaks and valleys of hunger, providing a smoother fasting experience.

Cognition Complex

Designed to calm the nervous system and sharpen focus.

L-Theanine
Promotes alpha-wave brain activity, and helps achieve a state of elevated focus and clarity. Works synergistically with your morning coffee, smoothing out the caffeine jitters to provide clean, sustained alertness throughout your fast.

SHR-5 Rhodiola
Fasting is a hormetic stressor—the positive stress we aim to achieve through fasting, which signals to your body to adapt and grow. Rhodiola is the premier adaptogen that acts as a thermostat for this response, keeping your cortisol levels balanced rather than spiking. We use the clinical SHR-5 extract to support deep resilience, so you can feel your best and leanest throughout your fast.

Yes—in fact, it is a strategic advantage. L-Theanine pairs synergistically with caffeine to create a powerful smart stack. Together they produce clean, directed energy while the electrolytes actively replenish key minerals. We are big coffee drinkers too and love coffee while we fast :)

To produce our capsules, we use the outer hull of organic rice, which is composed of insoluble fiber and natural silica, not the starchy endosperm used for energy. This material is non-glycemic and non-insulinogenic, meaning it is not metabolized as glucose and will not trigger an insulin response or inhibit autophagy. The amount present is negligible—trace quantities (milligrams)—far below the threshold required to stimulate an mTOR response or trigger insulin secretion.

The baseline protocol is to take two capsules each morning of your fast without food. Because CORE is formulated with water-soluble cofactors and chelated minerals, it offers maximum bioavailability even in the absence of dietary fat. It is the perfect first-thing-in-the-morning ritual.

Here's how to optimize that dosage for your specific fasting style:

Extended Fasts (24 Hours+ / OMAD)

For those doing fasting for a full day or more, the priority is maintaining electrolyte homeostasis and cognitive function. We recommend taking 2 capsules in the morning with at least 12oz of water. To sustain performance during longer windows, you may take two additional capsules in the early afternoon (before 3 PM) to replenish depleted minerals.

The Daily Intermittent Faster (16:8 or 18:6)

To extend your overnight fast until lunch, take 2 capsules in the morning with at least 12oz of water. This hydrates you early and introduces the Metabolic Complex to stabilize morning glucose signaling, while the saffron minimizes the 10am hunger wall, so you can confidently reach your eating window with effortless discipline and food freedom.

We offer a 30-day satisfaction guarantee. If you're not completely happy with your purchase, you can return it for a refund or exchange. Please visit our Return Policy page for more details.

Kētos is the safest and easiest vitamin supplement system to upgrade your fast. At Kētos you can buy trusted, hand-crafted products for fasting and find the latest science on ketosis all in one place.

Founded in 2023 by New York City based fasters, metabolic health enthusiasts, nutrition researchers, scientists and performance-focused founders, our company was built to help you enhance your fast and stay safe while engaging with this exciting new wellness approach. Our mission is to help you enhance your fast by achieving better health through ketosis. This is why we offer the following benefits as part of our customer guarantee:

BACKED BY SCIENCE

Clinically Curated Formulas

There are endless supplements in the world. We prefer to offer fewer products that meet a higher standard. Kētos products are:

Intentionally curated
We don’t release a product unless we believe it fills a real need for fasters and people pursuing ketosis.

Mechanism-driven
Each product starts its life from “How does this fit into a fasted, ketogenic physiology?”

Built on evolving research
Our thinking is informed by current science on the metabolic process, fasting ketones, and insulin resistance. We update our perspective as the evidence evolves.

If we wouldn’t feel good using a product in our own fasts, we wouldn’t feel right putting the Kētos name on it.

PREMIUM SUPPORT FOR FASTERS

Personalized Guidance for Real-World Routines.

Fasting isn’t one-size-fits-all. Neither is Kētos. Our vision of support includes:

Education that respects your intelligence
Clear explanations of how fasting and ketosis work.

Protocol-aware guidance
Whether you follow 16:8, alternate-day fasting, keto cycles, or longer fasts, our content and tools are built to help you integrate Kētos intelligently.

Human-first communication
Straightforward, science-informed information so you can make better decisions and feel safe and secure while fasting.

We’re here to help you confidently gain control of your fast.

CLEAN-LABEL FORMULATIONS

Purity and Transparency Guaranteed.

Fasting is a high-trust practice. You’re intentionally changing when and how you eat. All Kētos products are designed to be fasting-compatible, so you can achieve your fasting goals with ease.

Built on a clean-label philosophy
Short, intelligible ingredient lists, each included for a clear purpose.

Free from unnecessary sugars and gimmicks
We avoid ingredients that undermine fasting or ketosis, like hidden sugars and hype-driven fillers.

Designed for real protocols
Our products are created with common fasting and ketosis strategies in mind.

Because of our long standing partnerships with the top scientists in the metabolic sciences, our supplements are best in class.

Our U.S. Based Team of Fasting Experts Has Your Back.

Fasting is our obsession. We’ve spent an unreasonable amount of time seeking out only the most effective products for your fast, so that you can buy and use with confidence.

  • MADE IN THE USA

    Proudly crafted in the USA with ultra-premium ingredients you can trust.

  • FREE 2-4 DAY SHIPPING

    Free 2-4 day USA shipping with tracking on all orders. 

  • NO HASSLE 30 DAY RETURNS

    No hassle 30 day returns on unopened packages.

  • THIRD-PARTY TESTED

    Produced in a FDA-registered, GMP-certified facility for purity and safety.