The beard was kept by all the prophets that Allah (God) sent the mankind, Nuh (Noah) Ibrahim (Abraham), Isma’il (Ishmael) Ishaq (Isaac) moses, Harun (Aaron), Yahya (John), Jesus and Muhammad and all the other prophets (peace and blessings of Allah be upon them all). Although Muslim men follow the command of the Prophet (peace and blessings of Allah be upon him) and grow their beards, here are some amazing facts researchers have stated regarding health benefits of having a beard:
Prevents Skin Cancer
Reduction of Asthma and Allergy Symptoms
Stay Young, forever!
Stave Off Illness
By: al-’Allaamah Badee’ud-Deen Shaah ar-Raashidee as-Sindee
All praise is for Allaah, Lord of the Worlds; and prayers and peace be upon the Master of the Prophets and Messengers, and his household, family and companions; whomsoever follows them with goodness until the Day of Recompense.
Allaah the Mighty and Majestic has made the figure of the human being very well and pleasing. As He said, “We have certainly created the human being in the best of moulds.” [Sooratut-Teen 95:4] 
Hadrat Ibn-e-‘Umar Radi ALLAHu Ta’ala Anho reported that the Messenger of Allah has said, “Do the opposite of what the polytheists do; let the beard grow long and clip the mustache.” A version has, “trim the mustache down and leave the beard.” [Sahih Bukhari, Vol 2, Page 875]