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.

€1.5 Million Cannabis Seized in Joint Dublin Operation
Calls For Prison Security Review After Inmate Died In Their Cell
Fuel Oil Prices At Highest Recorded Value In Five Years
Over 200 Fines For E-Scooter Offences Issued In Kildare Carlow Area
Planned 72-Hour Ambulance Strike Called Off
Taoiseach Travelling To Vatican To Meet Pope Leo
Newbridge Scientist Hopeful For Ambitious Project Aimed At Preventing Hospital-Acquired Infections
Irish Rail To Scrap IT System Believed To Be Worth €50 Million