Mayspice is not often found in any grocery stores and is usually ordered online for residents outside of rural towns and villages in Italy. The powder and substance itself was created by Mario Esposito, a man who's daughter was unable to stomach the paste-like form of actually mayonnaise. The powder was the only alternative and was a way to evenly spread mayonnaise without over-using.
It's used for people who like flavor and are on diets or weight-loss programs. Mayspice is very hard to find.