Sea salt made the old-fashioned way might have less plastic pollution in it than salt made in big factories — how it's made could affect how much microplastic ends up in it.

What we've found so far is that the evidence leans toward traditionally harvested sea salts possibly having fewer microplastics than industrially harvested ones [1]. Our analysis of the available research suggests that the method used to produce sea salt may influence how much microplastic contamination ends up in the final product. We looked at one key assertion from the data, which indicates that older, more traditional ways of making sea salt might result in lower levels of plastic pollution compared to large-scale industrial methods [1]. This idea is supported by 39.0 studies or data points, with no studies found that contradict it. However, we want to be clear: this number does not confirm that traditional sea salt is definitely cleaner, nor does it prove industrial methods are worse. It only shows which way the current evidence leans based on what we've reviewed so far. We don’t yet know exactly how much less microplastic might be present, or under what specific conditions this difference occurs. The available evidence hints at a pattern, but we don’t have enough detailed data to say how strong or consistent this effect is across different regions, production batches, or testing methods. Our current analysis shows that how sea salt is harvested could matter when it comes to microplastic content. But because our view is still limited, we can’t say for sure how big a difference it makes in real-world use. Practical takeaway: If you're concerned about microplastics in your diet, the way sea salt is made might be something to consider — but there isn’t enough clear evidence yet to say one type is meaningfully cleaner than another.