Multiple chemical sensitivity appears to me to be a made up disease. This is supposed to be a disease in which the sufferer is ‘allergic’ or sensitive to all the modern chemical used today. From what I have read on MCS, no credible research supports it (bogus research does support it). The only people that seem to support it as a real condition are those who have a book to sell on it or are selling what appear to be bogus treatments for it. I guess there is good money and selling woo. I could not find any research on it worth it in the scientific literature. Until something credible comes, then this is snake oil.