Do Fermented Ingredients Benefit Your Skin?

I recently received this Rose Galactomyces Essential Toner to test from iUNIK, a Korean-based brand focused on helping your skin with its offering of minimalist, natural products at a reasonable price point. I love rose toners because they smell great and they're gentle, hydrating, and calming on my skin. But the word 'galactomyces' really threw me off - I had absolutely no idea what Galactomyces Ferment Filtrate (GFF) was in the ingredients list so I decided to do some digging.