Essential Oils

Lemongrass essential oil at 10% concentration achieved a 75% reduction in dandruff by day 7 and 81% by day 17 in a randomized controlled trial of 30 volunteers. Oregano oil contains carvacrol and thymol, which are broad-spectrum antimicrobials, but its savory scent may be off-putting in a toothpaste context. Rosemary essential oil inhibited M. furfur at 0.5% concentration, making it five times more potent than selenium sulfide, which required 2.5% to achieve the same effect. The choice of essential oil in the recipe is a matter of personal flavor preference, as all three options provide genuine antimicrobial benefit. Tea tree oil mixed into coconut oil should be applied to affected skin daily for three to four days. Lemongrass essential oil efficacy does not scale linearly with concentration; the 10% solution outperformed both 5% and 15% formulations. Tea tree oil at 5% in shampoo produced 41% improvement in dandruff versus 11% in placebo over four weeks in an RCT of 126 subjects, with no adverse effects reported. Clove oil contains eugenol, a potent antibacterial and analgesic compound with historical use in dentistry. The echinacea and tea tree oil combination works through four…