Honey

"Honey: Its Medicinal Property And Antibacterial Activity

The healing property of honey is due to the fact that it offers antibacterial activity, maintains a moist wound condition, and its high viscosity helps to provide a protective barrier to prevent infection. Its immunomodulatory property is relevant to wound repair too. The antimicrobial activity in most honeys is due to the enzymatic production of hydrogen peroxide. However, another kind of honey, called non-peroxide honey (viz., manuka honey), displays significant antibacterial effects even when the hydrogen peroxide activity is blocked. Its mechanism may be related to the low pH level of honey and its high sugar content (high osmolarity) that is enough to hinder the growth of microbes."

US National Library of Medicine, Honey: Its Medicinal Property And Antibacterial Activity, 2011

Honey hinders the growth of microbes; less microbes leads to faster healing of wounds... This was only known recently, however it was portrayed in the Quran 1400 years before it was discovered.