Betaine wani nau'in fili ne na kwayoyin halitta wanda ke ƙunshe da atom ɗin nitrogen mai inganci da aka haɗa zuwa ƙungiyoyin methyl uku da kuma atom ɗin oxygen mara kyau. Hakanan an san shi da trimethylglycine kuma ana samunsa ta dabi'a a cikin abinci da yawa, irin su beets, alayyafo, da hatsi gabaɗaya. A wasu lokuta ana amfani da Betaine azaman ƙarin abinci ko sinadarai a cikin samfuran kulawa da mutum saboda yuwuwar amfanin lafiyarsa, kamar inganta lafiyar zuciya da rage kumburi.