Microbiome (aka probiotics) is a relatively new trend in the skincare world. It is an ecosystem of bacteria that lives on the skin's surface. Having a balanced microbiome is beneficial, especially to skin health. The microbes inhabiting skin, such as viruses, bacteria, and fungi, are vital to maintaining skin health by reinforcing skin barrier function, which keeps harmful aggressors out and helps reduce skin inflammation. If the microbiome is disrupted, infections and skin disorders such as atopic dermatitis (eczema) can occur.