In Iran, the salt people eat has some lead in it—on average, about 2.98 micrograms per gram. Rock salt tends to have more lead than sea or refined salt, so the kind of salt you eat might affect how much of this harmful metal you're exposed to.

What we've found so far suggests that the type of edible salt may affect lead contamination levels in Iran. Our analysis of the available research shows that rock salt tends to contain more lead than sea or refined salt. The evidence we've reviewed indicates that, on average, edible salt in Iran contains about 2.98 micrograms of lead per gram [1]. This amount varies depending on the type of salt. Rock salt, which is mined from underground deposits, appears to have higher levels of lead compared to sea salt or refined salt [1]. Since people consume salt regularly, the type chosen could influence long-term exposure to lead, a harmful substance. Our current analysis is based on a single assertion supported by 42.0 studies, with no studies refuting this point [1]. While the number of supporting studies appears high, we are still working with limited types of evidence—only one distinct claim has been analyzed so far. This means our understanding is incomplete and could change as more data becomes available. We don’t yet know how much this difference in lead levels translates to actual health effects, or whether processing methods, geographic sources, or consumption patterns play a role. Also, we can’t say how widespread the use of each salt type is across Iran. Because our analysis is ongoing, we remain cautious about drawing strong conclusions. What we can say is that, based on what we've reviewed so far, the kind of salt consumed might influence lead exposure in Iran, with rock salt showing higher contamination levels. Practical takeaway: If you're in Iran and concerned about lead exposure, choosing sea or refined salt over rock salt might help reduce your intake—though more research is needed to fully understand the differences and their health impact.