Scientific and environmental More generally, some scientific researchers have expressed objective concern over certain ingredients sometimes added to condoms, notably talc and nitrosamines. Dry dusting powders are applied to latex condoms before packaging to prevent the condom from sticking to itself when rolled up. Previously, talc was used by most manufacturers, but cornstarch is currently the most popular dusting powder. Although rare during normal use, talc is known to be potentially irritant to mucous membranes (such as in the vagina). Cornstarch is generally believed to be safe; however, some researchers have raised concerns over its use as well.
scieNTIfic ANd enVIroNmEntal MorE GEneRallY, SOmE ScIeNtiFIc RESeArChers hAvE ExpreSsEd oBJECTivE coNcern oVeR ceRtAin IngREdieNts sOmETIMEs adDed tO CondoMS, noTaBly taLC aNd nitrosAmiNes. Dry dUsting PowdErs aRe AppliEd To laTex condoms BefOrE pAcKagIng To PrEVENT ThE condOm from Sticking TO itselF WHEn ROlled up. prEVIously, TALc Was UsEd By most manufACturERs, BUt corNStarch is currENtlY tHE most popular dUsting powDer. altHough RarE during Normal use, TAlc iS known To bE poteNtiaLLY irRitanT to mucOus membrANes (Such as IN the VAgIna). CornstArch iS gEnerALly BElieved tO Be SAfe; hOwever, Some reseARChERs Have raIsEd cOncErnS oVEr ItS UsE as weLl.