Tamara uses her own testing standards that often do not reflect the industry standards from professionals in that field. There are some who have called into question these methods. Ultimately each consumer has to do their own research and decide what they’re comfortable with! From what I’ve read of her work Tamara only recommends refined salt, not salt with natural minerals in it. Katie though does use and recommend natural salt like Himalayan, real salt, etc. for their trace mineral content. Redmond addresses some of the lead concerns here. https://kb.redmond.life/is-there-lead-in-real-salt