Hair Envy Essential Oil Blend 1/3 fl oz. Add 75 drops of Hair Envy into 8 ounces of shampoo and/or conditioner and blend well. Rosemary essential oil strengthens circulation. As a result, it could prevent hair follicles from being starved of blood supply, dying off, and leading to hair loss. Beyond stimulating hair growth, rosemary essential oil is used to prevent premature graying and dandruff. It may also help dry or itchy scalp. Cedarwood essential oil is thought to promote hair growth and reduce hair loss by balancing the oil-producing glands in the scalp. It also has antifungal and antibacterial properties, which can treat different conditions that may contribute to dandruff or hair loss. Lavender oil can speed up hair growth. Knowing that lavender oil has properties that can generate the growth of cells and reduce stress, researchers on one animal study found that this oil was able to generate faster hair growth in mice.