Tea Tree Therapy Anti-Fungal Serum combines Undecylenic Acid, a proven anti-fungal with Tea Tree Oil and Eucalyptus radiata oil. It is an ideal treatment to protect and treat Nail, Toe Nail Fungus, Athletes foot and Ringworm. Suitable for fungus from contact sports. Tea Tree Therapy Anti-Fungal Serum Provides an invisible protective layer over affected areas. Easy brush on applicator. Contains no petrochemicals or mineral oil based ingredients.