EAC In-sideout Gut and Immune Health Optimiser for Cats

We really wanted to like this product, it sounds good, all the information sits with the type of quality we buy for the cats, but the smell is not good and the cats gag when it is in their food. Even a tiny amount they will not eat food if we have placed this in it. We have tried heating the food, straight from the can, mixing different foods but they will not go anywhere near it.