The DUO Standard

1. 01

   Purposeful

   Every ingredient on the label is there for a stated reason, and we explain that reason in plain English. Where a formula uses a proprietary blend, we list the blend's total and its ingredients, but the manufacturer does not disclose individual amounts - and we say so on the product page.

2. 02

   Evidence-led

   The nutrition research behind DUO is published and public. Our research library lists all eleven sources, each linked to the original paper. Product claims are structure/function claims based on established ingredient research, not on the studies in that library.

3. 03

   Transparent

   The complete Supplement Facts panel is on every product page. Ingredients come from established manufacturing partners.

4. 04

   Tested

   Manufactured in FDA-registered facilities operating under GMP standards consistent with 21 CFR Part 111. Our manufacturers test for identity, potency, heavy metals and microbial contamination; the specific panel varies by product.

   FDA registration does not mean FDA has tested or approved these products.

5. 05

   Explainable

   If we can't explain why something is in a formula, in plain English, it doesn't belong in the formula. No science degree required.

DUO products are dietary supplements, not medications.