From:  Atlantic algae as food and their extracts

Phycocolloids used in the European food industry

PhycocolloidsE number
Alginic acidE400
Sodium alginateE401
Potassium alginateE402
Ammonium alginateE403
Calcium alginateE404
Propylene glycol alginateE405
AgarE406
CarrageenanE407
Semi-processed carrageenanE470a
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E numbers (“E” means “Europe”) are codes for food additives