It’s the miraculous cure-all incorporated into everything from beauty regimens to post-workout recovery baths, and it can be found on just about everyone’s dinner table: salt. Who knew – other than Nepalis 2,000 years ago and 6th century African merchants selling it ounce for ounce with gold – that it would one day end up in products you use to breathe or sleep better. But much of its benefits remain far from scientifically proven, so what has been shown to work? We looked deep into the research to get the full story on Himalayan salt caves, isolation tanks, and, yes, Neti Pots, to see how effective they truly are. Then we ranked them. Here, from most gimmicky to legitimate health aids, are those 'miraculous' salt treatments, ranked.