Summary
Probiotics have been extensively reviewed for decades, emphasizing on
improving general gut health. Recently, more studies showed that probiotics
may exert other health-promoting effects beyond gut well-being, attributed to
the rise of the gut–brain axis correlations. Some of these new benefits include
skin health such as improving atopic eczema, atopic dermatitis, healing of
burn and scars, skin-rejuvenating properties and improving skin innate
immunity. Increasing evidence has also showed that bacterial compounds such
as cell wall fragments, their metabolites and dead bacteria can elicit certain
immune responses on the skin and improve skin barrier functions. This review
aimed to underline the mechanisms or the exact compounds underlying the
benefits of bacterial extract on the skin based on evidences from in vivo and in
vitro studies. This review could be of help in screening of probiotic strains
with potential dermal enhancing properties for topical applications.