| Number | Name | Comments | 
| E620 | L-Glutamic acid | might cause similar problems as MSG(621), young children should avoid it | 
| E621 | Monosodium glutamate (MSG) | can be an allergen, not permitted in foods for infants and young children | 
| E622 | Monopotassium glutamate | can cause nausea, vomiting, diarrhoea , abdominal cramps. Typical products are low sodium salt substitutes | 
| E623 | Calcium glutamate | no known adverse effects | 
| E624 | Monoammonium L-glutamate | no known adverse effects | 
| E625 | Magnesium di-L-glutamate | no known adverse effects | 
| E627 | Disodiumguanylate | not permitted in foods for infants and young children | 
| E631 | Disodium inosinate | not permitted in foods for infants and young children | 
| E635 | Sodium 5'ribonucleotide | not permitted in several countries | 
| E636 | Maltol | no known adverse effects | 
| E637 | Ethyl maltol | no known adverse effects |