Children as young as 7 are sharing skin care tips online, but a new study suggests their favorite products may be harmful.

Popular TikTok videos featuring teens’ personal skin care routine frequently feature products that carry a high risk of skin irritation and allergy, researchers reported June 9 in the journal Pediatrics. The top-viewed videos contained an average of 11 potentially irritating active ingredients, researchers found.

According to a new study published in Pediatrics, there are hundreds of videos on TikTok created by kids aged 13 and younger demonstrating their skincare routines.