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

A new study from Northwestern Medicine examined the potentially harmful impacts of TikTok skin care routines. Researchers found that these routines could cause skin damage.

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.