Rosemary and Tea Tree essential oils have been known to have hair-growing properties and can be used to help men combat hair loss. Both Rosemary and Tea Tree oil have natural components that have been shown to increase hair follicle strength and reduce hair shedding. When used together, Rosemary and Tea Tree oil can help to promote hair growth by stimulating the scalp and providing a nourishing environment for healthy hair. Massage the blend of oils into the scalp and leave on overnight before shampooing out in the morning. This will ensure that your hair is getting the maximum benefit from the essential oils. Regular use of either Rosemary or Tea tree oil can have a profoundly positive effect on the strength, shine, and growth of your hair. Rosemary oil can stimulate the growth of thicker, healthier hair thanks to its antiseptic and anti-inflammatory properties. When massaged into the scalp twice a day, it can help to increase blood circulation to the scalp and reduce excess sebum production from the scalp glands.