Trichophyton Rubrum (T. rubrum) is the most common. This number jumps to 1 out 2 (50%) for those over 70. This is a highly desired product that is available at a fraction if the price. Clinically proven, it will keep nails and skin strong. Kerassentials Oil believes you will be pleased with your purchase. Nena Luster has over 14 years of experience as a family nurse practitioner, including in emergency medicine and urgent care. Oral Medicines - Lamisil, Sporanox, and Sporanox - are two medications currently prescribed. Dr. Brandon Johnson, a Chicago resident, USA writes on the Kerassentials official website, "I tried many products before Kerassentials. Kerassentials contains tea tree oil as an ingredient. used in the skincare industry for decades now. Back to the top Some risk factors are more influenced by lifestyle than medical conditions.