Scheme of alga- and edible mushroom-based phytochemicals. Phytochemicals are secondary metabolites and bioactive compounds naturally found in plants and organisms such as microalgae, macroalgae and edible mushrooms. Among phytochemicals, there are carotenoids, sterols, polysaccharides, and phenols that have biological activity that affects human health. Many phytochemicals act as antioxidants; others succeed in suppressing harmful processes in the body’s cells, preventing the proliferation of cancer cells, regulating lipid levels and having anti-inflammatory activity. (Created with BioRender.com (accessed on 1 September 2022)).