Can Chitosan Remove Microplastics From the Body? What New Studies Show

Early studies suggest that specific chitosan preparations may change particle counts in a fixed stool subsample or estimated blood measurements. The two human pilots were very small, and they do not prove that ordinary chitosan supplements clear microplastics from organs, reduce total body burden, or improve health.

In the news
A widely viewed video described 800 milligrams of chitosan as pulling microplastics out of blood. We checked that framing against two human pilots and two rat studies.[1][2][3][4][5]

Quick answer

Chitosan is an interesting research lead, not a proven microplastics-removal treatment. One 10-person pilot found more counted microplastic particles in a 5-gram stool sample collected the next morning after a single dose of a specific preparation. A separate controlled pilot found a 26.3% decline in the study's estimated blood microplastic concentration after 15 days, but only 11 people received the intervention.[1][2]

Rat experiments also found greater fecal recovery of uniform polyethylene microspheres with chitosan. None showed that particles left human organs, total body burden fell, or health improved.[3][4]

Three things to know

• The human evidence is tiny. The pilots involved 10 and 21 people, with short follow-up and no clinical health outcome.
• Excretion is not the same as whole-body clearance. Particles in stool may never have entered circulation, while a changing blood measurement does not reveal what happened in tissues.
• The tested preparations matter. These studies do not validate every chitosan supplement or finished commercial formula.

How the main claims hold up

Claim 1: Did chitosan increase microplastics recovered in stool?

PFK verdict: Rat studies reported greater fecal recovery of deliberately fed model particles. One 10-person human pilot found more particles in a fixed 5-gram next-morning stool subsample, not verified total excretion.

In the 2025 study, 10 adults ate the same standardized evening meal in two phases one week apart and provided stool the next morning. In the second phase, they also took 0.8 grams of Procambarus clarkii chitosan before the meal. Mean particle counts in 5-gram stool subsamples were 965 after chitosan versus 654 without it.[2]

That result does not establish where the particles came from. The study used a fixed phase order, analyzed one 5-gram next-morning stool sample per phase, and did not complete an intake-output mass balance. It used a Mann-Whitney test for paired observations and reported multiple polymer comparisons without a multiplicity adjustment. Some particles were not found in the standardized meal, leaving background exposure and transit unresolved.[2]

The paper declared no financial support or conflicts of interest but listed a 2024 patent titled “COMPOUNDS FOR BINDING OF MICROPLASTICS.” It also contains an affiliation correction that did not change the scientific content.[2]

In a 2025 experiment, six rats per group received 200-micrometer polyethylene spheres. The chitosan group produced more feces and had reported recovery above 100%, signaling counting or mass-balance uncertainty. The authors declared no competing interests.[3]

A 2026 study used 45- to 53-micrometer polyethylene spheres. Its four-day experiment found greater fecal recovery and less gastrointestinal retention with medium- and high-molecular-weight chitosan. A separate eight-day experiment focused on gut-microbiome endpoints. Both used six male rats per group and a diet containing 5% chitosan. Recovery was extrapolated from 40-milligram fecal subsamples. The supplier funded the work, supplied the chitosan, and employed three authors.[4]

Claim 2: Did 800 milligrams pull microplastics out of blood?

PFK verdict: One tiny controlled pilot reported a lower blood measurement, but it did not prove a blood-to-stool clearance pathway.

In the 2026 pilot, 11 healthy adults took 0.8 grams per day of Procambarus clarkii chitosan for 15 days. Ten adults in a separate control group received placebo. The intervention group's estimated blood microplastic concentration fell from 1.84 to 1.34 micrograms per milliliter, reported as a 26.3% decrease. The control measurement stayed nearly unchanged.[1]

That signal does not show that 26.3% of all microplastics in the body were removed. The small groups were matched rather than randomized, although participants and investigators were blinded. The Methods name a paired Wilcoxon test, while the Results also report Mann-Whitney and Tukey tests. No formal between-group comparison of changes is presented.[1]

Diet and exposure were not tightly controlled. The micrograms-per-milliliter value is an estimate from the paper's microscopy and spectroscopy workflow, not a validated total-body measure. The study did not track labeled particles from blood into stool or measure organs and tissues. Our guide to interpreting microplastics blood tests explains why a changing number is not automatically a diagnosis or a whole-body measurement.[1]

The blood pilot declared no external funding or known competing interests, but it tested the same PCC research line and cited the earlier patent-bearing study. Independent replication remains important.[1]

Claim 3: Does this mean a chitosan supplement can clear the body?

PFK verdict: No. The studies did not test durable whole-body clearance or health benefit.

The studies did not show removal from the brain, arteries, liver, lungs, or other tissues. They did not establish total body burden, whether any change lasted, or whether health improved.[1][2][3][4]

Formulations differ in source, molecular weight, deacetylation, dose, and testing. One preparation's results do not validate another supplement or commercial blend.

What should you do now?

PFK does not recommend buying chitosan to remove microplastics. Discuss allergies, medicines, pregnancy, or health conditions with a qualified healthcare professional before considering a supplement.

Reducing avoidable plastic contact is more defensible than assuming it can be reversed later. Prioritize heat, abrasion, and repeated food or drink contact. Our broader guide, Can You Detox Microplastics?, explains why exposure reduction and bodily removal are different questions. Microplastics 101 covers common exposure routes and practical starting points.

These steps do not promise zero exposure, remove particles already in the body, or prevent disease.

PFK assessment: Chitosan has produced a legitimate early research signal. The current evidence is too small, short, formulation-specific, and methodologically uncertain to support a consumer microplastics-removal recommendation.

How PFK evaluated these claims

PFK separated fecal recovery of model particles, human stool counts, blood measurements, durable reduction across body compartments, and improved health. Evidence at one stage does not prove the next. We also checked controls, methods, formulation, conflicts, and publication status.

No retraction, expression of concern, or result-changing correction was found for the four primary papers as of September 20, 2026. The human findings have not been independently replicated.

Research reviewed September 20, 2026. This article is for educational purposes and is not medical advice.

Sources

[1] Cornelli U, Belcaro G, Casella C. “Reduction in Circulating Microplastics in Humans Following Gastrointestinal Sequestration by Chitosan: A Pilot Controlled Study.” Journal of Xenobiotics. 2026;16(3):92. https://doi.org/10.3390/jox16030092

[2] Casella C, Cornelli U, Ballaz S, et al. “Preliminary Study on PCC-Chitosan’s Ability to Enhance Microplastic Excretion in Human Stools from Healthy Volunteers.” Foods. 2025;14(13):2190. https://doi.org/10.3390/foods14132190

[3] Liu D, Shimizu M. “Ingesting chitosan can promote excretion of microplastics.” Scientific Reports. 2025;15:14041. https://doi.org/10.1038/s41598-025-96393-w

[4] Liu D, Morikawa S, Izumi R, et al. “Effect of different chitosan molecular weights on microplastic excretion.” Frontiers in Nutrition. 2026;13:1869140. https://doi.org/10.3389/fnut.2026.1869140

[5] Doctor Mike Hansen. “800mg of This Pulls Microplastics Out Of Your Blood.” YouTube. September 5, 2026. https://www.youtube.com/watch?v=r9qIMTmU1gM