Absolutely. Every probiotic strain in Winnow is Generally Recognized as Safe (GRAS) for human use and has a long history of safe consumption. Winnow is formulated for adults ages 18 and older. If you have any questions or specific health concerns, please consult your physician before use.

Why we test

Today’s food system is more complex than ever. Even foods labeled “healthy” can carry invisible traces of pesticides, heavy metals, or microplastics. Labels don’t always tell the full story. That’s why we go further. Every batch of Winnow is tested with Light Labs to ensure purity, potency, and safety throughout production.

We’re proud to partner with Light Labs

Light Labs is an ISO-17025 accredited facility built on a simple belief: transparency is the key to a healthier food system. They’re reshaping how testing is done—measuring contaminants down to parts per billion and turning data into clear, actionable results.

What we test for

Allergens
Free from gluten, dairy, soy, peanuts, tree nuts, sesame, lupin, fish, shellfish, and crustaceans. Nothing detectable, nothing hidden.

Pesticides
Hundreds of residues screened. Results: all below 25 ppb—thousands of times lower than U.S. safety limits. Glyphosate and AMPA undetectable.

Microbes—wanted and unwanted
Beneficial probiotics verified for viability by CFU counting and rRNA sequencing. Light Labs confirms every batch is free from harmful microbes including coliforms, staphylococcus aureus, e. coli, listeria, pseudomonas, salmonella, bacillus cereus, and mold.

Heavy metals
Arsenic, cadmium, lead, and mercury all below 10 ppb—far under global safety thresholds. For context: a single banana naturally contains more heavy metals than a year’s supply of Winnow.

Compliance
Fully Prop 65 compliant.

Our promise

Every result is measured in parts per billion—a single drop in an Olympic-sized pool. “Not detected” means nothing measurable. Any trace levels are far below limits set by the FDA, WHO, and EFSA. You can trust that Winnow is clean, safe, and backed by validated science.

No…and yes. Winnow contains a high CFU (colony forming units) dosage of the most researched, tested, and proven probiotic strains on the market which support overall digestive health. And, Winnow does something no other probiotic does. It includes a proprietary, patent-pending blend of probiotics selected for their unique abilities to bind microplastics in gut-simulated lab tests.

Our team of experts, PhDs, and advisors have decades of collective experience in microbiological engineering, gut health, and microplastics expertise to help create the most effective probiotic supplement available today.

No! Winnow is plastic-free from the capsule to the package.

Loaded question. Microplastics awareness and research is still relatively new and evolving quickly. No one knows definitively the health risks they pose. But, where there’s smoke, there’s often fire. Microplastics contain, BPA, PFAS and other harmful “forever” chemicals. Studies suggest potential respiratory, digestive, reproductive, cardiovascular, immune system, and brain health related risks.

We’ve demonstrated binding by Winnow probiotics to five different plastic types: polyethylene terepthalate (PET; commonly found in water bottles and food packaging, polyethylene (PE; plastic bags, films, and containers), polypropylene (PP; food containers, straws, and bottle caps), polyvinyl chloride (PVC; pipes, flooring, medical supplies), and polystyrene (PS; foam cups, packaging, disposable cutlery).