* [[Biotechnology]] — gel to immobilize cells/enzymes
* [[Personal lubricant]]s — laboratory studies suggest that carrageenans might function as a [[topical microbicide]]s, blocking [[Sexually transmitted disease|sexually-transmitted viruses]] such as [[HIV]], [[Human papillomavirus|HPV]] and [[Herpes simplex virus|herpes]]<ref>[http://www.populationcouncil.org/microbicides/index.html Carraguard]</ref><ref>[http://pathogens.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.ppat.0020069 Carrageenan is a potent inhibitor of papillomavirus infection], Buck, et al. PLoS Pathog. 2006 Jul;2(7):e69</ref>
Lambda carrageenan is used in animal models of inflammation used to test analgesics, because dilute carrageenan solution (1-2%) injected subcutaneously causes swelling and pain.
