Microplastics in Sea Salt Help Dangerous Bacteria Grow

The microplastics in your sea salt aren't just inert particles. They help dangerous Vibrio bacteria grow thicker biofilms and become harder to eliminate.

Microplastics Supercharge Bacteria

Researchers tested how microplastics in seawater and sea salt affect Vibrio harveyi, a pathogenic bacteria. In water containing microplastics, the bacteria formed thicker, denser biofilms because the plastic particles blocked normal bacterial dispersal, according to a 2026 study in Mar Pollut Bull.

In clean water, the bacteria dispersed multiple times during the study period. In microplastic-contaminated water, dispersal dropped to just one or two events. That means the bacteria stayed concentrated and protected within their biofilm.

It Hurt Living Organisms Too

When brine shrimp were raised in microplastic-contaminated seawater made from harvested sea salt, their development was impaired. The combination of microplastics and amplified pathogenic bacteria created a double threat.

Sea salt is widely consumed and increasingly contaminated with microplastics from ocean pollution.

What You Can Do

Consider using mined rock salt or Himalayan salt instead of sea salt. Reduce plastic waste to help clean up ocean contamination. And explore non-toxic kitchen alternatives for safer food prep.

Also see glass food containers for safer alternatives.

Source: Sahandi J, Sorgeloos P, Tang KW, et al. (2026). Mar Pollut Bull.