Nutribiotic The Original Liquid with Vitamin A - Contains GSE - A potent, natural and effective anti-microbial product with a wide variety of uses - both internally and externally. Grapefruit Seed Extract destroys disease and infection-causing microbes on contact and can be taken internally as an excellent immune system supporter. Use as a gargle for sore throat relief, as a dental rinse for thorough oral hygiene, as an ear or nasal rinse to fight infections, as a scalp treatment for dandruff, or a douche to fight yeast infection - the list goes on. Nutribiotic GSE (Grapefruit Seed Extract) Liquid Concentrate also has many household uses, such as a cutting board sanitizer to protect against e-coli and salmonella, germicidal cleaner for bathrooms and kitchen or as an air purifier - Concentrated and effective.