'The only way to lose weight is to eat more healthy food and train.
'Shame on you @khloekardashian you know this is b******t.'
Vogue continued: 'I'm actually a big Kardashian fan but I think what they sell sometimes is disgraceful. Money isn't everything, they have a huge platform and shouldn't be pushing ridiculous products on people who trust them.
'Instagram has now become a part of my job too and it annoys me when I see anyone being dishonest or selling something they know is awful. I wouldn't do it because it's lying to people!
'I personally buy a lot of things I see on Insta but I'd hate to be duped for the sake of quick buck! (Euro/ Pound)'.
Vogue’s outburst was a direct response to Khloe’s recent post promoting the slimming brand.
Posing on an exercise mat whilst holding the shake in front of the camera, Khloe wrote:
'#ad Okay... LISTEN UP. I’ve posted with @flattummyco’s Shakes many times in the past and YES, I also use a personal trainer and a nutritionist.
'But seriously guys, everything counts. THESE SHAKES WORK to help get that tummy back to flat, especially after a super busy holiday season, and that’s exactly what I’ve been doing... Start 2020 off right and get back on track, their New Year, New Tummy Sale in full swing. Trust me guys…'
Khloe has been heavily criticised in the past for promoting the controversial brand.
A post last year garnered dozens of angry responses from fans and the KUWTK star was also heavily criticised by body confidence activist Jameela Jamil.
'If you're too irresponsible to: a) own up to the fact that you have a personal trainer, nutritionist, probable chef, and a surgeon to achieve your aesthetic rather than this laxative product and b) tell them the side effects of this NON-FDA approved product, that most doctors are saying aren't healthy.
'Side effects such as: Possible Flat Tummy Tea side effects are cramping, stomach pains, diarrhea and dehydration... then I guess I have too. It's incredibly awful that this industry bullied you until you because this fixated on your appearance. That's the media's fault.
'But now please don't put that back into the world and hurt other girls the way you have been hurt. You're a smart woman. Be smarter than this,' she added.