DEFENSE is a premium paraben-free glycerine-free water based formula blended with sea kelp and guava bark. Protects against yeast infections by maintaining healthy microflora. A U.S. National Cancer Institute (NCI) study shows that carrageenan a compound extracted from red algae may inhibit the spread of the human papilloma virus (HPV the virus that causes cervical cancer and genital warts). Safe to ingest.