Gemma Collins' adverts for Skinny Jab have broken advertising rules by making irresponsible claims, according to an industry watchdog.
Gemma posted an Instagram story in April mentioning SkinnyJab and saying: "Working on my summer body whilst in isolation ... and this really helps me."
The Advertising Standards Authority (ASA) said the post had breached the code because it had not been clearly marked as an ad, and said it had told Collins and the company to ensure future ads included a "clear and prominent identifier such as #ad".
Weight loss injection providers all 'promoted prescription-only medicines to the public despite it being against the law', the Advertising Standards Authority (ASA) said.
Skinny Revolution Ltd, Skinny Clinic and SkinnyJab also "irresponsibly" implied that the products could be used by people who were not overweight and made claims that are not compatible with good medical and nutritional practice, the watchdog ruled after what it called a "proactive" investigation into the sector.
Skinny Revolution exploited people's insecurities around body image during lockdown, the watchdog said.
Before and after images of a slim and overweight Barbie doll alongside the phrases "Me in Quarantine" and "Don't let lockdown knock you back" had "poked fun at women's physicality and played on those anxieties", the ASA said.
Skinny Clinic was deemed "socially irresponsible" for ads including one featuring a glamour model in a mask with the phrase "forgot to eat again" alongside two laughing emojis.
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The watchdog said: "We considered this implied that she wanted to lose a significant amount of weight and the injection would enable her to skip meals to achieve that; consumers, therefore, could also use the product for the same purpose. "
All three providers were warned by the ASA not to make claims that people could lose a precise amount of weight in a stated period of time and not to promote prescription-only medicines to the general public.