Sa'ad oil is used to prevent hair growth. It is an effective and safe method used to prevent hair growth. This is because the oil contains flavonoids, which have an anti-androgenic effect and thus prevent the growth of hair that increases during puberty in certain areas of the body, such as underarm and pubic hair. This unwanted hair causes some discomfort for women, so they resort to removing it periodically through electrolysis, laser hair removal, intense pulsed light, anti-androgen medications, or eflornithine cream. This process is expensive and has some side effects. In a study conducted on some women for six months to determine the effectiveness of sa'ad oil and laser in preventing hair growth and to compare their results, it was found that sa'ad oil is no less effective in preventing hair growth than laser hair growth, but rather superior to it, as it also prevents the growth of small white hairs, unlike laser hair removal.

Using cyperus oil to prevent hair growth has several advantages, 

It has no side effects when used orally or when applied to the skin.

It prevents the growth of both black and white hair, as its effectiveness does not depend on the presence of melanin, unlike laser hair growth prevention.

It is a safe method of preventing hair growth.