Wild, B-Perfect Cosmetics, Dylan Oaks and Califia Farms were found to be in breach of the ASA code.
It's important for the public to know when they're being advertised to, according to the Advertising Standard's Authority.
In its latest Complaints Bulletin, six of the sixteen cases that were upheld in full came from posts on influencer's Instagram pages.
Wild, B-Perfect Cosmetics, Dylan Oaks and Califia Farms were found to be in breach of the ASA code.