Catherine Tyldesley, Ryan Thomas, Shobna Gulati and Kym Lomas all sent recent tweets endorsing Juice Life, with Shobna, Catherine and Alison King also posing with drinks for pictures.
A spokeswoman for Corrie issued the statement: "No Coronation Street actors were paid for tweeting about the product."
It has also been reported that some Street stars have been wearing free gifts on the show to plug businesses.
Paula Lane donned a £35 bracelet and £15 earrings from Bling Rocks, while Lisa George wore a Bananagrams necklace which spelled out her character's name in tiles. Both exchanged tweets with the firms about wearing their products but there is no suggestion either was paid or kept the jewellery.
ITV furiously denied they broke rules on product placement and soap bosses says the jewellery was 'editorially justified' with a spokesperson commenting:
"Props come from a number of sources and are not part of product placement."
"We strongly refute any suggestion that the actors or ITV have acted in an improper manner or against regulations."
The controversy comes after we previously reported how Dispatches tricked Street stars into promoting fake firm Puttana Aziendale, Italian for "corporate whore".