The Science
The science of digestion demands precision. Every Stillbelly formulation starts with ingredients that have been studied in humans, dosed to match the research, and delivered in formats designed to survive the trip to your gut.
For humans, by evidence.
Our process starts with published human research, then moves through ingredient sourcing, formulation, and third-party testing before anything reaches your door.
01
Ingredients
Clinically studied, transparently dosed. We formulate with ingredients that have real human research behind them, at the doses the research actually used.
Apple Cider Vinegar
The Spark delivers 1000mg of ACV powder per serving, the form studied for post-meal blood sugar response and satiety, without the taste or tooth-enamel exposure of liquid vinegar.
Digestive Enzymes
Bromelain (from pineapple) and papain (from papaya) are proteolytic enzymes that help break down protein. The Quick Fix delivers them in a fast-dissolving strip that starts working on contact.
Probiotics
The Shield combines 13 Lactobacillus and Bifidobacterium strains at 20 billion CFU. Bacillus coagulans in The Quick Fix is spore-forming, built to survive stomach acid.
Prebiotic Fiber & Botanicals
Inulin and psyllium husk feed beneficial gut bacteria and support regularity. The Cleanse pairs them with acai, ginger, and slippery elm to support the body's natural reset.
02
Delivery
An ingredient only matters if it arrives. We choose delivery formats built to survive digestion, or skip it entirely.
Strips That Start on Contact
The Quick Fix dissolves on your tongue, so enzymes begin working immediately, no water, no waiting, no capsule to break down.
Spore-Forming Survival
Bacillus coagulans forms a protective spore that shields it from stomach acid, so it arrives in the intestines alive and ready to work.
Research-Matched Dosing
We dose to what the published research used, and we print every amount on the label. No proprietary blends hiding underdosed ingredients.
03
Quality
Manufactured in GMP-certified facilities, verified before it ships.
GMP-Certified Manufacturing
Every product is produced in facilities that follow current Good Manufacturing Practices, with lot-level traceability.
Third-Party Testing
Finished products are tested for identity, potency, and contaminants by independent labs.
No Fillers, No BS
No artificial colors or unnecessary preservatives. Ingredient lists you can actually read.
The state of the modern gut.
Before the formulas, the numbers. This is how common struggling digestion actually is.
0%
Only about 5% of Americans meet the recommended daily intake for dietary fiber.
American Journal of Lifestyle Medicine, 20170%
About 61% of Americans report experiencing at least one digestive symptom, such as bloating or abdominal discomfort, during a typical week.
American Journal of Gastroenterology, 20180%
Only about 1 in 10 U.S. adults eats enough vegetables each day to meet federal dietary recommendations.
CDC (MMWR), 20220%
Roughly 40% of people worldwide experience a common functional digestive condition, according to a large Rome Foundation global study.
Gastroenterology, 2021The research library
Published human research behind the ingredients we formulate with.
In adults with insulin resistance or type 2 diabetes, taking vinegar with a high-carb meal improved the body's insulin sensitivity.
Research by Johnston CS and colleagues, 2004 · published in Diabetes Care
02Apple Cider VinegarOver 12 weeks, obese adults taking daily vinegar significantly lowered body weight, BMI, visceral fat, waist size, and blood triglycerides versus placebo.
Research by Kondo T and colleagues, 2009 · published in Biosci Biotechnol Biochem
03ProbioticsIn a 90-day IBS trial, Bacillus coagulans significantly reduced bloating, diarrhea, abdominal pain, and stool frequency versus placebo.
Research by Majeed M and colleagues, 2016 · published in Nutr J
04Digestive EnzymesResearch review: bromelain, a protein-digesting enzyme from pineapple, is absorbed while keeping its activity and shows anti-inflammatory, anti-swelling effects.
Research by Pavan R and colleagues, 2012 · published in Biotechnol Res Int
05Prebiotic FiberResearch review: prebiotic fibers like inulin selectively feed beneficial Bifidobacteria, and higher fiber intake is linked to lower body weight and heart disease.
Research by Slavin J, 2013 · published in Nutrients
06Prebiotic FiberEvidence review: gel-forming fibers like psyllium lower cholesterol, improve blood sugar control, and produce softer, easier-to-pass stools.
Research by McRorie JW Jr and colleagues, 2017 · published in J Acad Nutr Diet
The humans behind Stillbelly.
A small team obsessed with digestion, sourcing, and getting the details right.
Kelly
Co-founder
Daniel
Quality & Sourcing
Amara
Community
Kenji
Research Operations
Claire
Operations
Mateo
Customer Experience
Ready to put the science to work?
Shop the SystemThese statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.