Data point: I was exposed to fluoridated water for 30 years growing up. When I moved to a non-fluoridated community 30 years ago, my thyroid went haywire (fluoride competes with iodine for thyroid receptors so the thyroid suppression that I had adapted to was suddenly removed, a similar effect has been seen on fluoride exposed fetuses). Instant medical cash-cow. Two years ago I installed a reverse osmosis water filter so the less bioactive calcum fluoride was also removed from my diet. Since I added 360mcg of K2 to the 10Kiu of D3 and the magnesium citrate and the herbal thyroid concoction I’d already been taking every day (about a week ago), I’ve slept better and dreamed more.
Btw: our steam-engine medical establishment only recently came to appreciate the importance of our internal ecosystem (gut flora) in maintaining health. Water chlorination kills bacteria, It’s like drinking a little antibiotic every day. My pet theory is that humans evolved to drink surface (highly oxygenated) water, which would support aerobic gut bacteria, so I I started ozonating my drinking water as well. Not sure but it might be helping. Mass water ozonation is a (more expensive) alternative to water chlorination fwiw. YMMV.