Researchers studied maca root, an Andes plant traditionally used for health benefits, by fermenting it with beneficial bacteria (Lactobacillus strains). They tested whether fermented maca could reduce skin inflammation and prevent excessive skin darkening. The fermented version worked significantly better than regular maca at both reducing inflammation markers and inhibiting melanin production in skin cells, suggesting it could be a valuable ingredient in cosmetic products designed to brighten skin and reduce irritation.