Is it safe to use sea salt with microplastic concerns?
Use it thoughtfully. Sea salt can carry microplastics, but the cited study is about brine shrimp and aquaculture, not proven human gut harm.
What is actually in it
Sea salt is made from evaporated seawater. Since seawater can contain microplastics, harvested sea salt can carry some of that contamination.
That does not mean every grocery-store sea salt is dangerous. It means ocean-sourced salt is one more small exposure to understand, especially if you use it every day.
What the research says
A 2026 Marine Pollution Bulletin study looked at microplastics associated with harvested sea salt.
In lab and brine shrimp tests, microplastics increased Vibrio harveyi biofilm concentration and thickness, raised Vibrio loads on or in brine shrimp, and reduced growth and survival. This is not a human study. It does support the basic point that sea-salt microplastics can carry biological activity, not just inert dust.
What to do instead
Use less salt overall, and rotate in mined or refined salts if microplastics are your main concern. Keep any salt dry in a sealed container. Do not pay extra for ocean-sourced salt because it sounds safer. The source matters.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Sea salt associated microplastics amplify pathogenic Vibrio and impair development in brine shrimp (Artemia franciscana). | Mar Pollut Bull | 2026 |