Is There Microplastic in Sea Salt?

The Short Answer

Yes. If you are eating sea salt, you are almost certainly eating plastic.

A landmark study analyzing 39 salt brands globally found that 90% contained microplastics. Because sea salt is produced by evaporating ocean water, it naturally concentrates whatever pollutants are floating in that water.

The only salts that are consistently naturally free of microplastics are mined salts (like Redmond Real Salt Review or Himalayan Pink Salt). These come from ancient underground deposits formed millions of years ago—long before plastic was invented.

Why This Matters

We are eating a credit card's worth of plastic every week.

While salt isn't the only source (water and seafood are worse), it is a daily contributor. Researchers estimate the average adult consumes over 2,000 microplastic particles per year just from salt.

Microplastics are endocrine disruptors.

These tiny particles often carry chemicals like BPA, phthalates, and heavy metals. Once ingested, they can leach these toxins into your body, potentially interfering with hormones, fertility, and gut health.

Unrefined isn't always better.

In the crunchy world, "unrefined" is usually a badge of honor. But with sea salt, unrefined means unfiltered. The gray color in some sea salts comes from clay and minerals, but it can also hide microplastic fibers that a refined salt would have processed out.

The Problem With Sea Salt

Sea salt is made by flooding ponds with ocean water and letting the sun evaporate it. The plastic stays behind.

• Asian Sea Salts: Consistently test the highest for plastic contamination due to heavy regional pollution.
• European/American Sea Salts: Generally test lower but are rarely plastic-free.
• "Grey" or "Wet" Salts: These salts (like typical Is Celtic Sea Salt Healthier) retain moisture and sediment. While mineral-rich, this structure traps plastic fibers more easily than dry crystals.

The Cleanest Options (And The Trade-Offs)

There is no "perfect" salt. You are essentially choosing between modern plastic pollution (sea salt) and ancient heavy metals (mined salt).

1. Mined Ancient Salt (Plastic-Free)

Examples: Redmond Real Salt, Himalayan Pink Salt

Why it’s good: Mined from deposits formed 150-250 million years ago. Zero exposure to modern ocean plastic.

The Catch: Because they come from the earth, they naturally contain trace heavy metals like lead and arsenic. While brands claim these levels are safe (and often lower than what's in vegetables), independent testing by groups like Lead Safe Mama has flagged them for exceeding strict safety limits for children.

2. Filtered Sea Salt (Low Plastic)

Examples: Jacobsen Salt Co.

Why it’s good: Harvested from current oceans but actively filtered. Jacobsen uses 0.5 to 5-micron filters to catch microplastics before the water is evaporated.

The Catch: It is expensive and harder to find than generic grocery store brands.

3. Refined Kosher/Table Salt (Cleanest but "Dead")

Examples: Diamond Crystal Kosher Salt

Why it’s good: The refining process involves boiling, filtering, and re-crystallizing, which effectively removes both microplastics and heavy metals. It consistently tests as "non-detect" for contaminants.

The Catch: It has no trace minerals. It is pure sodium chloride. For the purist, it lacks the "soul" (and magnesium/potassium) of real salt.

What to Look For

Green Flags:

• "Mined" or "Ancient Sea Bed" — Indicates it's from pre-plastic eras.
• "Filtered" — If it's sea salt, look for explicit mentions of filtration (micron ratings are a bonus).
• "Origin: Utah or Himalayas" — Terrestrial sources are safer from plastic than marine sources.

Red Flags:

• "Sea Salt" (Generic) — Without origin or filtration details, assume it has plastic.
• "Fleur de Sel" (Unfiltered) — Often skimmed from the surface where floating microplastics accumulate.
• Origin: Asia — Studies show these salts have the highest plastic particle counts.

The Best Options

The Bottom Line

1. Switch to mined salt like Redmond Real Salt if your primary concern is microplastics. It is the most accessible ancient salt.

2. Use Diamond Crystal Kosher Salt if you want the absolute cleanest product (lowest lead and lowest plastic) and don't mind missing out on trace minerals.

3. Avoid generic "Sea Salt" listed as an ingredient in processed foods. It is likely the lowest quality, highest-plastic salt available.

FAQ

Does Celtic Sea Salt have microplastics?

Likely yes. While the brand claims to test for purity, it is an unrefined salt harvested from the Atlantic Ocean. Independent tests and school studies have found microplastics in Celtic-style salts because the "unrefined" nature preserves everything in the water—minerals and plastic alike.

Is Himalayan salt plastic-free?

Mostly yes. It comes from ancient deposits. However, some studies have found small amounts of plastic in Himalayan salt, which likely comes from packaging (plastic grinders/bags) or cross-contamination during processing, rather than the salt itself.

Can I filter microplastics out of my salt water?

If you dissolve salt in water for a "sole" or electrolyte drink, you can run it through a coffee filter. This will catch larger fibers, but many microplastics are smaller than the pores of a standard coffee filter. It's better to buy cleaner salt.

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