system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why lotions, soaps and other non-ingestible products need to be "gluten free". I thought it was a gut issue.

My lotion indicates that it is gluten free. Why does this matter, assuming people don't eat lotion. I've seen this on soaps, shampoos and other toiletries. I thought gluten sensitivity and celiac disease were based in the gut. This trend seems to have gotten out of hand.
gpt
Congratulations, you are smarter than the target market for these products. 

Gluten-free is primarily about marketing. The number of people who actually suffer from gluten intolerance is tiny. The amount of money to be made from selling gluten-free everything to everybody is astronomical. 

That's the entire answer.