Does Sea salt have microplastics?
The short answer
Yes, and this one is measured across the world — microplastics were found in 36 of 39 commercial salt brands from 21 countries. But read the dose: salt is eaten in grams, and even the worst brands work out to a tiny annual particle intake next to bottled water.
Why Sea salt scores 41
The contamination is in the seawater, so evaporation concentrates whatever was already there
Sea salt carried substantially more than rock or lake salt in the same study — the source is the whole story
Regional variation tracked local seawater pollution, which is why brand origin matters more than brand name
Packaging contributes almost nothing here, unusually for this database
Where the 41 comes from
Five components, added. The page renders the parts rather than a stored total, so the number cannot disagree with the reasoning behind it.
- Packaging contact
- 6 / 30
- Use conditions
- 4 / 25
- Measured release
- 22 / 25
- Polymer behaviour
- 5 / 10
- Processing
- 4 / 10
What material touches the contents, over how much surface area, for how long. Glass and steel score near zero here; a film pressed against fatty food scores near the top.
Heat, abrasion, flexing, repeated opening, reuse beyond design life. The same bottle scores differently in a fridge and in a hot car.
What a laboratory actually counted, for this product or its category. A high number here means real particles were measured, not that the material looks suspicious.
How this specific polymer behaves — brittleness, fat solubility of its additives, thermal stability, whether it is a polymer named in existing restrictions.
What happened before you bought it. Retort sterilisation inside the pack, hot-filling, and pressurised brewing all happen at the most migration-favourable moment.
What we don't know
What this page really has to convey is proportion. A high particle count per kilogram of salt is not a high particle count per person per year, because nobody eats a kilogram of salt in a sitting. This is one of the clearest cases where a scary-sounding measurement is genuinely reassuring once you do the arithmetic — and where most coverage does not.
This section is on every page in the database, including the ones where the answer is comfortable. How evidence grades work →
Better options
Ordered by how much they change, not by how much they cost.
Rock or mined salt
measured far lower in the same study — the deposit predates plastic
Do not change anything on this account
honestly the right advice; spend the effort on bottled water
Check the one in your kitchen
This page scores Sea salt as a product. Formulations, packaging and suppliers change, and the specific item you own has its own condition — a scratched pan and a new one are not the same object. Scan yours for a score built from what is actually in front of you.
Scan my packaged foodSources behind this score
Each with the finding we use it for and the limitation that finding carries — because a study quoted without its boundaries is how this subject got so noisy.
- peer-reviewed2018
Kim 2018 — Found microplastics in 36 of 39 commercial salt brands from 21 countries, with sea salt carrying far more than rock or lake salt — the contamination tracked regional seawater pollution.
Limitation: Salt is eaten in grams, not litres. Even the worst brands worked out to a small annual particle intake next to bottled water, and the study is better read as a measurement of the ocean than as a warning about your salt cellar.
- peer-reviewed2018
Kosuth 2018 — Detected synthetic particles in 81% of tap water samples worldwide, in all 12 brands of beer tested, and in all 12 brands of sea salt.
Limitation: Overwhelmingly fibres, which are as likely to come from airborne contamination during sampling as from the product — the authors say so. It establishes ubiquity rather than any particular source.
- agency2026
US FDA — States that current scientific evidence does not demonstrate that the levels of microplastics detected in foods pose a risk to human health, while listing detection and characterisation as a research priority.
Limitation: A statement about the state of evidence, not a finding of safety. "Not demonstrated to be harmful" and "demonstrated to be harmless" are different claims, and the agency is explicit that the research is ongoing.