Focus. Calm. Fewer cravings.
The multivitamin built for fasting. Six active ingredients, anchored by clinically studied Satiereal® saffron and SHR-5 Rhodiola, meet the cravings, the slump, and the stress that test a fast.
30-day money-back guarantee · Free US shipping
Power-up your fast. Core is engineered to help you feel your best and leanest by optimizing your physiology in a fasted state. Six active ingredients work together to supercharge your metabolic architecture by supplying essential co-factors required to fuel clean ketolytic energy production and modulate biological stress response to hunger, to help you achieve your fasting goals.
Adults who fast and want to feel their best doing it.
Core contains two targeted complexes that combine six active ingredients to synergistically optimize fasting physiology:
The Clean Fast Guarantee
Vegetarian, vegan, gluten-free, nut-free, and contains no artificial colors or flavors. Core is made in the USA with the highest quality ingredients available. It is a 100% fasting-compatible, clean-label, ultra-premium dietary supplement.
Zero MCC. Zero inulin. Zero maltodextrin. Zero sugar. Zero artificial anything.
Made in the USA in a cGMP-registered facility. Every batch is third-party tested for heavy metals and label accuracy. Vegan, gluten-free, and nut-free, in a plant-based HPMC capsule.
Zero sugar, zero calories, nothing that spikes insulin or breaks autophagy. Made to take straight through your morning.
Satiereal® saffron is shown in a placebo-controlled trial to reduce snacking, the part of fasting that breaks most people.
L-Theanine and L-Tyrosine support calm, directed focus and smooth the jitters from your morning coffee.
Two of the six actives, Satiereal® saffron and SHR-5 Rhodiola, are the exact extracts from published human trials.
Hunger is often just blood sugar in disguise: as glucose dips, cravings spike. Chromium supports carbohydrate metabolism and helps keep blood sugar that is already in the normal range steady, and Satiereal® saffron supports the serotonergic pathways tied to satiety, so the waves get gentler and the cravings quiet down.
Illustrative of the mechanism, not a measured clinical outcome. Individual results vary.
The differentiator for cravings. 176 mg of Satiereal®, a standardized saffron extract shown in a placebo-controlled human trial to reduce snacking and between-meal eating, the part of a fast that breaks most people.*
The stress adaptogen. 200 mg of SHR-5, the exact standardized Rhodiola rosea extract from human trials on stress, fatigue, and mental performance, dosed within the studied range.*
The calm in your coffee. 200 mg of L-Theanine promotes alpha-wave activity for smooth, directed focus, and takes the jitters out of your morning cup.*
A fast draws down the very chemistry that keeps you sharp, and cortisol climbs to fill the gap. Core's Cognition Complex works at the synapse: rebuilding the signal, adding calm, and steadying the stress.
With Core: L-Tyrosine restocks the dopamine and norepinephrine that drive focus, L-Theanine promotes alpha-wave calm, and Rhodiola steadies the cortisol response, so the signal gets through.
Illustrative of the mechanism, not a measured clinical outcome.
Every batch is third-party tested for heavy metals and label accuracy, made in the USA in a cGMP-registered facility.
Gluten-Tested
Dairy-Tested
Nut-Tested
Soy-Tested
Shellfish-Tested
Sesame-Tested
Corn-Tested
Glyphosate / AMPA-Tested
No Binders
No Preservatives
Prop. 65 CompliantEvery one of Core's six actives earns its place. Two go further than the rest. Satiereal® saffron and SHR-5 Rhodiola are the exact standardized extracts behind published, placebo-controlled human trials.
Published human trial
176 mg
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
Published human trials
3 studies
Placebo-controlled human trials plus a 2022 review, on stress, fatigue and 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, it is dosed at 200 mg, within the range used in the trials.
Darbinyan et al., 2000 · Olsson et al., 2009, Planta Med · 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.
Core combines six active ingredients, anchored by clinically studied Satiereal® saffron and SHR-5 Rhodiola, for the cravings, the slump, and the stress that test a fast. See how it compares.
A comparison of categories, not any specific product. Reflects typical use in each category; specific products and habits vary. *Structure/function statements; see the disclaimer at the bottom of this page.
Reviews
Questions
Straight answers on fast-safety, autophagy, caffeine, and how to take Core.
No. Core has no sugar, no calories, and no protein, fat, or carbs, just active micronutrients and botanical extracts in a vegetarian capsule. It is built to be fasting-compatible.
No. Everything in Core is non-caloric and non-insulinogenic: micronutrients and botanical extracts that don't spike insulin or pull you out of the fasted state. The trace rice hull in the capsule sits far below the threshold that would trigger mTOR.
No. Core is completely caffeine and stimulant free. The L-Theanine is there to pair with your morning coffee if you drink it, smoothing the jitters, but Core works just as well on its own and won't leave you wired.
Yes, and it is a strategic advantage. L-Theanine pairs with caffeine for clean, directed energy without the jitters. We are big coffee drinkers too and love coffee while we fast.
Fasting is a unique metabolic state that generic multivitamins are not built for. Core includes high-potency thiamine and chromium to support cellular energy and steady blood sugar, L-Tyrosine and L-Theanine for calm focus, and clinical doses of Rhodiola and saffron to support a healthy stress response and manage cravings.
Take two capsules each morning of your fast, without food, with a large glass of water. It is the perfect first-thing ritual. On longer fasts of 24 hours or more, you can take a second serving before 3 PM.
Yes. Core is built for daily use and the doses are designed for ongoing use. Take it on your fasting mornings; on non-fasting days it is fine to take as well.
Yes. Core is vegan and vegetarian, in a plant-based HPMC capsule. It is gluten-free, nut-free, and made without artificial colors or flavors.
Core is made for healthy adults and most people tolerate it well. Saffron and Rhodiola are biologically active botanicals, so if you take prescription medication, particularly antidepressants, blood thinners, or blood-pressure or blood-sugar medication, or you are pregnant or nursing, check with your doctor first.
Yes. Sodium is the electrolyte you lose fastest as insulin drops, and a capsule cannot carry a sodium dose. Core stays focused on cravings and clarity, while Trace, our fasting electrolyte drink, handles hydration. Run them together and you are covered on both fronts.
We offer a 30-day satisfaction guarantee. If you are not completely happy with your purchase, you can return it for a refund or exchange. See our Return Policy page for details.
Two capsules each morning. Six actives for the cravings, the focus, and the energy a fast asks of you. Zero sugar, caffeine-free, won't break your fast.
Add to Cart · $39.0030-day money-back guarantee · Subscribe & save
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Individual results vary.
