Caters to MCS. This indicates that the linked website is accustomed to serving those with multiple chemical sensitivities. If you have MCS, you will find understanding of your condition here, and products to meet your needs. If you haven't got MCS, check out these sites for some of the purest products available.
More information on how each of these ratings apply to different products can be found on the product pages themselves.
Please keep in mind that these ratings are very, very general. Don't take them too literally. They are meant to be loose guidelines, not absolute descriptions. They are based on information I was able to obtain from the websites themselves or from phone calls or emails with the website business.