Sesamol

Cross-reactivity

Case notes

Sesamol looks like a chemical additive, and that impression is what makes it slip by. It is a sesame-derived ingredient, but the word "sesame" never appears in it. A parent scanning a panel for a familiar term can read straight past it — the same is true of its aliases, Sesamolina and Sesamum indicum extract. Sesamum indicum is simply the botanical name for sesame, so an ingredient list can name the source plant precisely while still reading, to a tired shopper in a grocery aisle, like something unrelated to seeds.

Two habits help. First, treat any ingredient beginning with "sesam-" as a sesame flag worth a second look rather than a coincidence of spelling. Second, learn the Latin binomial alongside the common name, because extracts and derivatives are often labeled botanically. Sesame also travels under names that carry no visible clue at all, including tahini, benne, halvah, and gomasio, so building a short personal list of these terms is more reliable than scanning for one keyword.

Sesamol sits in the 2S albumins family, a group of seed storage proteins that also includes peanut (Ara h 2/6/7), walnut (Jug r 1), cashew (Ana o 3), and hazelnut (Cor a 14). Within that family, structural similarity means roughly 25 to 50 percent of people allergic to peanut also react to tree nuts, and cashew-pistachio overlap is very strong at about 90 percent. Reactions in this family can range from contact dermatitis to respiratory symptoms to anaphylaxis. Which of these names matter for your child is a question for the clinician who knows their history.