This article asserts that consuming Himalyan salt, which clocks in with lead content at 100 ppb, is incredibly dangerous. The supplied evidence is that water with lead content of 5 ppb is declared unsafe, so obviously the salt must be unsafe as well.
Here are some calculations:
- The FDA recommends consuming no more than 2300 mg per day, but many sites cite them as saying 3400. People like salt; let's use the higher number!