There's a new fad weight loss supplement around Hollywood, and it involves coffee.

Sbwire.com reported that green coffee is "known to be one of the best natural slimming aids that can help in getting rid of excess body weight...proclaimed as the miracle fat burner by fitness experts on TV."

The website said it tastes and smells a lot different than regular coffee. The weight loss supplement contains cholrogenic acid known to boost metabolism to help you burn fat faster. 

In order to see results, the website said someone would have to take at least 1600mg of green coffee extract a day. Green coffee extract has a potency of 800mg per pill, so two pills could be taken a day. 

Komonews.com reported that singer Katy Perry tried the green coffee extract to look her best for her July Vogue cover. The website said that the weight loss supplement is somewhat responsible for her slim down, along with eating better, cutting out alcohol for a few months and doing a cleanse. 

Actress Demi Moore has also reportedly said she used the extract to slim down, too.

TV Personality Dr. Oz has also publically praised green coffee.

Oz is reported to have said that adding the extract, which has little caffeine, cause people to double their weight loss, losing two pounds a week instead of one. 

Eating well with the extract is key, however. Research claims the extract won't help unless you're eating a balanced diet.