Why is it.................?

[GasoLane]

Originally Posted by Syndrome

They are artificial reproductions of natural substances.

It can be, but you'd have a hard time proving that it wasn't a natural product.

http://mbm.net.au/health/

E100 Curcumin Orange-yellow colour; derived from the root of the curcuma plant, but can be artificially produced

E621 Monosodium L-glutamate (MSG) Sodium salt from glutamic acid (E620), a natural amino acid (building block of protein). Commercially prepared from molasses by bacterial fermentation.