"The best thing with which to color your gray hair is henna or katm." [Abu Dawood and At-Tirmithi]

　　Jabir Ibn 'Abdullah narrated that Abu Quhafa, the father of Abu Bakr came on the day of the conquest of Makkah with his hair and beard extremely white. The Prophet said: “Change his hair color with something and do not use black.”

　　Salmah, the Prophet's maid, said: “Anyone who complained to the Prophet from pain in his head, he would say to him, ‘cup it.’ And when complained from pain in the foot, he would tell him, ‘Dye it with henna.’” [Abu Dawood and Ibn Majah]

　　She also said: “Whenever the Prophet had an ulcer, fester or eczema, he ordered me to put henna on it.” [Authentic, Jaami' Al-Usool by Ibn Al-Atheer]

　　Henna has been utilized since ancient times as a dye to color the nails, hands, feet and hair. The traditional henna is manufactured from a plant known as Lawsonia Alba. This plant is cultivated in Saudi Arabia, India, Sri Lanka, Iran, Egypt, North Africa and Australia among others.

　　The effective dye component of henna is called Lawsone. It consists of fat, resin, manitol and volatile oils.

　　It is mentioned in the Islamic Encyclopedia of Medicine that the ancient Egyptians used henna in mummification.

　　The Egyptian henna is typically a green substance that gives the hair a reddish brown color. Other colors are obtained by adding other dyes to the natural henna. Some women in Sudan add a substance called paraphenylen ediamine to the henna to reduce the time needed for dyeing from an hour to several minutes. But this mixture can be fatal although its cause is unknown and this is why people who apply henna are warned against adding this substance. Henna in itself is safe and doesn't have any known side effects. It is 100% natural. The henna found in different brands of shampoos in stores and pharmacies is free of this substance.

　　Recent medical researches:

　　Many people in recent years have been inclined to use natural substances. The idea of returning to using some old substances that were once used as cosmetics is gaining ground in the medical field. One of these substances is henna. If we look at the different haircare products available off-the-shelf like shampoos, conditioners, hair color and hair creams, we will find that much of them contain henna.

　　This substance is described in the Hadeeths as being the best source for hair dyeing. What is the scientific evidence that encourage the return to the use of henna?

　　An American magazine specializing in skin diseases, Cutis, once published an article about henna in its first edition in 1986. Dr. Natu is a famous professor of skin disease from New York University in America, stated that henna has several benefits, the most important being as follows:

　　1. Henna enhances the natural color of hair and gives it shine. One would have to use it several times before any visible changes in color appear.

　　4.