4,600 people test gut health products in landmark study

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Adults, at least 21 years of age at the time of electronic consent, inclusive of all ethnicities, races, and gender identities. Assigned sex at birth will determine sex-specific recruitment and surveys (male vs female) employed, when needed * Resides in the United States * Endorses a desire for improved bowel habits, less bloating/indigestion, and/or fewer stomach aches/pains * Has the opportunity for at least 20% improvement in their primary health outcome * Expresses a willingness to take a study product and not know the product identity (active or placebo) until the end of the study Exclusion Criteria: * Report being pregnant, trying to become pregnant, or breastfeeding * Unable to provide a valid US shipping address and mobile phone number * Reports current enrollment in another clinical trial * Reports being a heavy drinker (defined as drinking 3 or more alcoholic beverages per day) * Unable to read and understand English * Reports a current and/or recent (up to 3 months ago) major illness and/or surgery that poses a known, significant safety risk. * Reports a diagnosis of cardiac dysfunction, liver or kidney disease that presents a known contraindication and/or a significant safety risk with any of the study product ingredients. NYHA (New York Heart Association) Class Ill or IV congestive heart failure, atrial fibrillation, uncontrolled arrhythmias, cirrhosis, end-stage liver disease, stage 3b or 4 chronic kidney disease, or kidney failure * Reports taking medications that have a well-established moderate or severe interaction, posing a substantial safety risk with any of the study product ingredients. Anticoagulants, antihypertensives, anxiolytics, antidepressants, chemotherapy, immunotherapy, sedative hypnotics, seizure medications, medications that warn against grapefruit consumption, corticosteroids at doses greater than 5 mg per day, diabetic medications, oral anti-infectives (antibiotics, antifungals, antivirals) to treat an acute infection, antipsychotics, MAOls (monoamine oxidase inhibitors), or thyroid products * Reports current use of the primary ingredient(s) and/or similar product(s) to the active study product(s) that may limit the effects of the study product * Lack of reliable daily access to the internet