Emulsifier

What are Mono and Diglycerides made of?
it mainly consists following three compositions:

Monoglycerides
Diglycerides
Triglycerides
It may also contain small percentages of free fatty acids and glycerol.

Monoglycerides and Diglycerides Percentages
The common content of monoglycerides in commercial food grades of mono- and diglycerides are 40%, 60% or 90%.

How are Mono and Diglycerides made?
The main raw materials involved in the production of mono and diglycerides are fatty acids and glycerol, both are naturally present in edible fats/oils of animals (e.g. cow, pig) and vegetable (various plant seeds).

GMS Source
The common vegetable sources of fatty acids and glycerol are as follows:

Palm oil
Coconut oil
Soybean oil
Rapeseed oil
Sunflower oil
Cottonseed oil