I've heard people say woo is "harmless..."

"Harmless?"
Bull!

The Miracle Mineral Solution (MMS) is, essentially, industrial strength bleach (28% sodium chlorite) that, when diluted in acidic juices, results in the formation of chlorine dioxide, a potent bleach used for stripping textiles and industrial water treatment. As a treatment for medical conditions (and other things) MMS should rank as among the most dangerous and delusional pieces of quackery out there, yet according to proponents, MMS can cure almost anything from cancer to AIDS and anything in between and beyond. There is no biological plausibility to any of these claims, and no evidence, either preclinical or clinical, that MMS can do what its proponents claim it can do. According to Kerri Rivera, one of the most dangerous and insane people on the planet, MMS can – in particular – cure autism, and her abhorrent insanity has unsurprisingly made significant inroads in already severely reality-challenged antivaxx communities, whose members, demonstrably mistakenly, still think that vaccines cause autism. Rivera was for instance invited to talk at the 2012 Autism One Quackfest to convince parents to torture their autistic children by giving them painful bleach enemas. As Rivera sees it, “autism means that your child has virus, bacteria, Candida, inflammation, heavy metals and food allergies ... [this is, hopefully needless to say, insane nonsense],”therefore these children take (her) poison, which would do nothing to address these issues if they had anything to do with autism, which they don’t. At the conference, Rivera boasted about 38 children who purportedly recovered in 20 months (by 2018 the number is allegedly in the hundreds, and if you need proof that her numbers are nonsense, here it is).

http://americanloons.blogspot.com/2019/03/2164-kerri-rivera.html

Report: Mom who triggered Amber Alert planned to inject 10-year-old daughter with bleach

SPOKANE, Wash. —
A mother who triggered an Amber Alert last week told police she was planning to inject bleach into herself and her child to rid themselves of parasites.

Court documents say 41-year-old Brooke A. Helmandollar has been charged with criminal mistreatment of her 10-year-old daughter, and may have mental health issues.

https://www.wisn.com/article/report-mom-who-triggered-amber-alert-planned-to-inject-10-year-old-daughter-with-bleach/27003226