Lactalbumin

Case notes

The word looks scientific enough to seem unrelated to the dairy case, and that's the problem. Lactalbumin is a milk-derived ingredient — a whey protein, identified on allergen panels as alpha-lactalbumin (Bos d 4) — but the ingredient line rarely spells out "milk" next to it. A parent scanning a label for the word they're trained to look for can read straight past it.

It also travels under several names. "Alpha-lactalbumin" and "lactalbumin phosphate" refer to the same ingredient, and the vaguer "milk protein" shows up in the same slot on some labels. Three different spellings, one source. When you're comparing two snack brands in a school-supply aisle, or checking a product you've bought safely for months after a formula change, it helps to treat all of these as a single entry rather than separate ingredients to look up individually.

Because it belongs to the broader milk allergen picture, lactalbumin sits alongside other names worth recognizing — whey, ghee, and milk protein hydrolysate all trace back to the same source. SleuthIt's curated notes place lactalbumin in a family described as usually moderate in severity, with documented cross-reactivity to lysozyme. None of that tells you how a specific child will respond; that's a conversation for their care team. What it does give you is a shortlist of label words to log consistently, so patterns across products and days are visible instead of buried in unfamiliar terminology.