How we make money, which programs we participate in, and why that does not influence our recommendations.
NutrientPairs participates in affiliate programs. When you click a product link on this site and make a purchase, we may earn a small commission at no additional cost to you. This commission is how we fund the research, writing, and hosting of the site.
We are required by the Federal Trade Commission to disclose these relationships clearly. This page is that disclosure.
Our primary affiliate relationship is with the Amazon Associates Program, which allows us to earn fees by linking to Amazon.com and affiliated sites. Our Amazon Associates tag is nutrientpairs-20. You can identify our affiliate links by the presence of this tag in the URL.
We may also participate in other affiliate programs over time, including direct relationships with supplement brands that meet our quality criteria. Any such relationship will be reflected on this page.
As of the last update to this page, Amazon Associates is the only active affiliate program we use.
We do not accept money from supplement brands in exchange for recommending their products. No brand has ever paid us to feature a product, write a favorable review, or include their ingredient in a pair.
Our product recommendations are based on ingredient form, dose, third-party testing, and manufacturer transparency. When we recommend a specific product, it is because we believe it is a good fit for the pair in question, not because the brand paid to be there.
If a product we recommend is not available through an affiliate program, we still recommend it. We will continue to name the product and encourage you to buy it wherever is convenient for you.
For every pair in our library, we evaluate available products against four criteria:
Form. The bioavailability of a nutrient depends heavily on its chemical form. For example, iron bisglycinate is absorbed more efficiently and with fewer GI side effects than ferrous sulfate. We recommend forms supported by absorption data.
Dose. We compare the per-serving dose to the evidence-based effective range. Products that underdose to hit a low retail price do not make our list.
Third-party testing. The dietary supplement category is poorly regulated. We prefer products from brands that publish third-party certificates of analysis (USP, NSF, Informed Sport, or equivalent).
Transparency. Brands that disclose their sourcing, manufacturing standards, and testing methods get preference over brands that keep this information opaque.
Affiliate income does not influence what we recommend. If we believe a product is not right for a given pair, we say so, regardless of whether clicking a link earns us a commission. If you ever see a recommendation on this site that seems to contradict that principle, please let us know.
For more on our research standards, see our research sources or read about our methodology.
Last updated: April 2026