Jojoba oil is a humectant ingredient. Jojoba oil contains antimicrobial and antifungal properties. While lab tests found that jojoba oil doesn't kill all bacterial or fungal species, it does kill certain bacteria and fungi that can cause salmonella, an E. coli infection, and candida. On a molecular level, jojoba oil is a wax. Although it can be absorbed into your skin, its waxy nature allows it to create a soothing seal on the surface.