Scope
Lip balm, toothpaste, antacids, sunscreen and hand sanitiser all file labels with the FDA. If it has one, you can screen it here.
Celiac disease is an immune response to gluten reaching the small intestine. So the useful way to group products is not by aisle, but by route of exposure.
Swallowed
Worth checkingGluten reaches the small intestine, so a celiac reaction is possible. This is the group the FDA's own draft guidance covers.
Applied on or near the lips
Worth checkingYou swallow more of these than you think. The FDA explicitly scopes its guidance to products applied on or near the lips for this reason — the exposure route is the same as swallowing.
Hands, then food
Reasonable to checkNo celiac reaction from skin contact, but anything on your hands can end up on a sandwich. Checking is about the transfer route, not absorption.
Skin only
Cannot cause a celiac reactionGluten is not absorbed through intact skin, and celiac disease is an intestinal response. You can check these here if you want to — but for celiac disease specifically, you do not need to.
Type a product name or the NDC from the package. Works the same whether it's a statin or a strawberry lip balm.
Screen a product →Yes. Lip balms are filed with the FDA as over-the-counter drug products, so they carry a Structured Product Label listing every inactive ingredient — the same kind of label a prescription drug has. Gluten Screen reads that label. Lip products are genuinely worth checking, because you swallow a meaningful amount of anything you put on your lips.
No. Celiac disease is an immune response to gluten reaching the small intestine, and gluten molecules are too large to pass through intact skin. Body lotion, shampoo and sunscreen cannot trigger the intestinal damage of celiac disease. Hand products are the practical exception, not because of absorption but because gluten on your hands can transfer to food you then eat.
Because spitting is not complete. Toothpaste is applied inside the mouth and some is inevitably swallowed, which puts it on the same exposure route as an oral medication. This is the same reasoning behind the FDA scoping its gluten labelling guidance to products applied on or near the lips.
Only when the manufacturer files a drug label for them. Many supplements are regulated as foods rather than drugs and carry no Structured Product Label at all, which means there is nothing for us to read. If a search returns nothing for a supplement, that usually means no drug label exists — not that the product is clear.
No. There is no US requirement for a drug label to declare gluten, and no equivalent of the 20 ppm threshold that governs "gluten-free" claims on food. What labels do list is every inactive ingredient — so the practical question becomes whether a starch excipient names its botanical source. When a label says only "starch", the source is undetermined and the manufacturer is the only one who can resolve it.
It would be easy to imply that every product needs checking. More searches, more pages, more worry. But a screening tool that manufactures concern is not a screening tool, and someone with celiac disease already has enough to track without adding their shampoo to the list.
So this page says plainly where the evidence stops. Skin contact does not cause celiac disease. Lip balm is worth a look. That distinction is the useful part.
Product counts are live totals of labelled products in DailyMed and include every brand and variant, not distinct items on a shelf. Gluten Screen is a label-reading tool, not medical advice, and is not a pharmacist, physician or dietitian. Individual sensitivity varies — if something has been causing you symptoms, that is worth raising with your care team regardless of what a label says.