E-number database

Amino-acid flavour enhancers versus MSG

Glycine and leucine can be synthetic or gelatin-derived. MSG is a fermentation glutamate with its own page.

E-number	Codex INS	Name	Ruling
E640	INS 640	Glycine and L-leucine (E640, E641)	Halal if verified · Source-dependent
E620	INS 620	E620–E625 (Glutamic acid and glutamates / MSG)	Halal · Source-dependent
E621	INS 621	Monosodium glutamate	Not yet reviewed
E641	INS 641	L-leucine	Not yet reviewed