How We Check Labels
Last updated: July 30, 2026
Every roundup on this site says a product is soy-free. That claim is only worth something if you know what we mean by it. This page is the rule we apply, written down so you can check our work and disagree with it.
Our standard in one sentence: if soy appears anywhere in the ingredient list, in any form, the product does not go on a SoyFreeSnacks list.
Ingredients that disqualify a product outright
We do not make an exception for the two ingredients most often treated as borderline. Soy lecithin disqualifies a product. Soybean oil disqualifies a product, including the highly refined kind that US labeling rules exempt from allergen declaration.
The full disqualifying list:
- Soy lecithin (E322 when derived from soy)
- Soybean oil, including refined, bleached and deodorized
- Soy protein isolate, concentrate, and hydrolyzed soy protein
- Textured vegetable protein and textured soy protein
- Soy flour, soy grits, soy milk solids
- Edamame, tofu, tempeh, miso, natto
- Soy sauce, tamari, shoyu
- Mono- and diglycerides when the source is stated as soy
Ingredients we have to resolve before we can list a product
Some ingredients hide their source. Natural flavors, vegetable oil with no source named, tocopherols and vitamin E can all be soy-derived without saying so. When we cannot resolve the source from the label or the manufacturer's published information, the product does not go on the list. An unresolved ingredient is treated as a fail, not a maybe.
Shared lines and "may contain" warnings
This is the one place we do not decide for you. Advisory statements like "may contain soy" or "made on shared equipment" are voluntary in the US. Two manufacturers with identical practices can label them differently, so the absence of a warning is not evidence of anything.
A product carrying an advisory warning can still appear on our lists, and we note the warning where we know about it. If you are managing a severe allergy, treat that flag as the point where you call the manufacturer, because we cannot see inside their facility and neither can the label.
What our check is, and what it is not
We read the manufacturer's published ingredient list on the date shown on the article and apply the rule above. That is a labeling check. It is not a lab test, a facility audit, or medical advice, and we never describe a product as safe for you specifically.
Our claim holds under one condition: that the formulation has not changed since the date on the article. Manufacturers reformulate without announcement, so the label on the package in your hand always outranks anything we published.
Money never moves a product onto a list
We earn commission when you buy through our links, and we accept advertising. A product cannot buy its way onto a list, and a commission has never moved a product up a ranking. If a product fails the rule above, no amount of money gets it on the page. See our affiliate disclosure for how the money side works.
Common questions
Does soy lecithin count as soy?
Yes. Soy lecithin disqualifies a product from every list on this site. It is the most common reason a snack that looks soy-free does not appear here, and it is the single ingredient we get asked about most.
Is soybean oil allowed?
No. Highly refined soybean oil is exempt from US allergen labeling rules and many people tolerate it, but we do not make that call for you. Any soybean oil in the ingredient list disqualifies the product.
What about products made in a facility that also processes soy?
They can appear on our lists, but we flag the advisory warning where we know about it. Shared-line statements are voluntary and inconsistent between manufacturers, so we treat them as information for you to weigh rather than a pass or fail we apply on your behalf.
How current are the ingredient checks?
Every product is checked against the manufacturer's published ingredient list on the date shown on the article. Formulations change without notice, so the label on the package you are holding is always the final word.
Found something we got wrong?
If a product on this site lists a soy ingredient we missed, tell us and we will pull it. Email hello@soyfreesnacks.com with the product and where you saw the label.