A cewar ƙamus, coenzyme wani abu ne wanda ba furotin ba ne wanda ke da mahimmanci ga aikin enzyme. Coenzymes sau da yawa suna ɗaure ga enzymes don taimakawa a cikin halayen sunadarai, kuma ana iya samun su daga bitamin ko wasu mahadi. Coenzymes suna shiga cikin matakai masu mahimmanci a cikin jiki, ciki har da samar da makamashi, metabolism, da kuma kira na DNA. Misalan coenzymes sun haɗa da ATP, NAD, da FAD.