Washington – Scientists have found presence of toxic forever chemicals — per and polyfluoroalkyl substances (PFAS) — in products used by females during menstruation, which, researchers think, might have been deliberately added, per an Independent report. Researchers said these products are designed to make people feel comfortable during their periods, their labels do not usually contain a list of the ingredients. They are called forever chemicals because they stay in the human bloodstream for a very long time without breaking down. As long ago as 2002, companies under pressure from the EPA began agreeing to phase out PFOS in all products, followed by PFOA in 2015.