Flavour enhancer

A flavour enhancer is a chemical to modify the taste and flavour of a food product, often to make them taste more 'savoury'.
The commonly used flavour enhancers are:
Glutamic acid[E620]
Monosodium glutamate[E621]
Monopotassium glutamate[E622]
Calcium diglutamate[E623]
Monoammonium glutamate[E624]
Magnesium diglutamate[E625]
Maltol[E636]
Ethyl maltol[E637]
Glycine and its sodium salt[E640]