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Allergen & sensitivity guide

Soy in skincare: the hidden names to check for

If you react to soy, the word itself is rarely what's on the label. Here are the names it hides behind — and what it can cross-react with.

The names Soy appears under

On an ingredients (INCI) list, watch for:

sojaglycine sojaglycine maxsoybeansoyahydrogenated soybeanlecithin

Seeing any of these means the product may contain soy, even if the front of the pack says nothing about it.

What it can cross-react with

Soy is a legume and shares proteins with peanut, so people with peanut allergy sometimes react to soy protein (the refined derivatives like lecithin and tocopherol are usually much lower-risk).

Peanut

Could Soy be why your skin keeps reacting?

If a product "breaks you out" for no obvious reason, a hidden ingredient is a common culprit — and because soy rarely appears under its plain name, it's easy to keep buying it by accident across totally different products. Reactions can look like redness, stinging, small bumps, itchiness, or a rash where you applied it. The pattern to watch for: it happens with several products that seem unrelated, but share one of the names above.

What to do if you think you're reacting to Soy

How Vaiya checks every product for Soy

When you tell Vaiya you react to soy, our allergen engine screens each product's full ingredient list for all of the hidden names above — not just the obvious one — and never recommends a product we can't verify is clear. It's the same check, free, for everyone, and it's the fastest way to find products that fit you. Check your shelf against soy →

Why you can trust this: Vaiya's recommendations are commission-blind — what we suggest and what we flag as unsafe is decided by an engine that never sees affiliate data, and that separation is enforced by an automated test in our build. We can't be paid to fake a safe.
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