Miracle Mineral Solution, or MMS, is a preparation which is basically table salt (sodium chloride - NaCl) with 2 extra oxygen atoms attached (chlorine dioxide - ClO2). THIS IS NOT BLEACH! (bleach is sodium hypochlorite - NaClO)
Update April 9 2019: The MMS Testimonials channel has been terminated by YouTube. However, you can still download each video testimonial from this website. Click the Download video link under each video.