Does Chlorella Detox Your Body?

Does chlorella detox dioxins? What the research shows

8 Oct 2026 – caesar langcat

In this animal study, it certainly did. A 1999 study in the Journal of Nutrition found that chlorella increased the amount of dioxins rats excreted in their stool, up to about ten times for the most toxic dioxin, TCDD. It worked both on dioxins the rats had just eaten and on dioxins already stored in their bodies. In humans, the evidence is limited to a study that found lower dioxin levels in the breast milk of women who took chlorella during pregnancy.

Chlorella is a single-celled green alga, sold dried as powder or tablets. It is widely marketed as a detox supplement, usually with limited evidence behind it. The dioxin research is one of the few studies where the effect was actually measured. This article explains what the studies did, what they found, and what the results actually mean.

What are dioxins?

Dioxins are by-products of burning and industry: waste incinerators, metal smelters or paper mills that bleach with chlorine. Forest fires produce some as well. Nobody manufactures them deliberately.

And they barely break down. From smoke and waste they get into soil and water, then into animals, where they collect in fat. According to the World Health Organization, more than 90% of the dioxins people take in come from food, mainly meat, dairy, fish and shellfish.

In the human body they are stored in fat tissue. It takes 7 to 11 years for the amount to drop by half. High exposure can damage the immune system, disrupt hormones and cause cancer. Everyone carries a small amount, which the WHO does not expect to cause harm, but it advises keeping exposure as low as possible.

The Japanese had a very good reason to study this. In 1968, contaminated rice bran oil poisoned thousands of people in western Japan with PCBs and related furans, an outbreak known as Yusho, which means “oil disease”. Europe had its own case in 1999, when dioxin-contaminated animal feed got into Belgian chickens and eggs.

How did researchers test chlorella against dioxins?

The study came from the Fukuoka Institute of Health and Environmental Sciences, working with a chlorella producer. It was published in the Journal of Nutrition. The team ran two experiments and measured the same thing in both: how much of the dioxin dose ended up in the rats’ droppings.

In the first, rats got a single dose of the actual contaminated rice oil from the Yusho poisoning. Half were then fed ordinary chow, the other half chow with chlorella added. This tested whether chlorella reduces how much dioxin the gut absorbs.

In the second, rats got the dioxins first. A few days later, once the dioxins had been absorbed and distributed through the body, half the rats switched to chlorella chow for about a month. This tested whether chlorella speeds up the removal of dioxins already in the body.

The rats ate a lot of chlorella: it made up 10% of their food. Scaled to a person, it comes to roughly 50 grams a day.

Does chlorella remove dioxins from the body?

In the first experiment, the ordinary-chow rats passed about 2% of their dose of TCDD, the most toxic dioxin, in their droppings. The chlorella rats passed about 20%. For a range of other dioxins, chlorella reduced absorption from the gut by roughly 40 to 50%.

In the second experiment, the dioxins had already been in the rats’ bodies for days. The chlorella rats still passed more of them over the following month:

Type of dioxin	Ordinary chow (% of dose excreted)	Chlorella chow (% of dose excreted)	Increase
TCDD (most toxic)	1.1	4.7	about 4.5×
A 5-chlorine furan (PeCDF)	0.3	1.0	about 3.5×
A 5-chlorine dioxin (PeCDD)	1.1	3.2	about 3×
A 6-chlorine furan (HxCDF)	0.7	1.7	about 2.5×

Most of the dioxin types tested showed a statistically significant increase. A few did not.

Taken together, chlorella did two things in these rats: it reduced the uptake of dioxins from food, and it increased the excretion of dioxins the body had already stored. Both are what people usually mean by detox.

How does chlorella bind dioxins?

The researchers wrote that the mechanism was not entirely clear.. They proposed three components of chlorella that could be responsible, all acting in the gut.

Fibre. The same group had shown earlier that some dietary fibres bind dioxins. Fibre that holds on to dioxins carries them out in the stool.
Chlorophyll. Many dioxins are flat molecules, and so is chlorophyll. A chlorophyll derivative is known to bind other flat toxic molecules, so chlorophyll may bind dioxins in the gut and stop them being absorbed.
Fats in the algae. The liver releases dioxins into the gut with bile, and the gut normally reabsorbs most of that bile. Chlorella’s fats may interfere with this reabsorption, so more dioxin leaves the body. Earlier rat studies found that chlorella has a similar effect on cholesterol. This would explain the result of the second experiment.

The authors concluded that foods rich in fibre and chlorophyll, such as chlorella, could reduce the absorption of dioxins from food, and that blocking reabsorption from bile could help clear dioxins already in the body.

Is there evidence in humans?

One small study. In 2007, Japanese researchers measured dioxins in the breast milk of 35 pregnant women, 18 of whom took chlorella tablets during pregnancy. The breast milk of the chlorella group contained significantly lower dioxin levels than that of the other women. The chlorella group’s milk also contained more immunoglobulin A, an antibody that helps protect nursing infants.

The same research group had found similar results in rats earlier. In a 1997 study, rats fed chlorella excreted up to 7.4 times more of one dioxin type than control rats.

No larger human trial has followed. So the human evidence points in the same direction as the rat studies.

What are the limitations?

It was done in rats. Results in rats often don’t always hold up in people, and the human evidence is just a single small study.

The dose was very high. Roughly 50 grams a day in human terms, more than anyone usually takes as a supplement.

The groups were small. The second experiment used four rats per group. A chlorella producer co-authored the study, and as far as we know no independent lab has repeated it.

It is not a treatment. Anyone who may have been exposed to toxic chemicals should see a doctor.

So the study gives a measurable basis for the detox reputation of chlorella in animals, but not proof that it works in people.

For reducing dioxin intake, the WHO recommends trimming fat from meat, choosing lower-fat dairy, and eating a varied diet with plenty of fruit, vegetables and grains.

Frequently asked questions

How much chlorella did the rats get?

Chlorella made up 10% of their diet. For humans, that would translate to roughly 50 grams a day, which is far more than a typical supplement serving. However, most people take relatively small amounts of chlorella. Taking 10, 20, or even 30 grams a day is both practical and affordable, bringing the intake considerably closer to the amount used in the study.

Does spirulina do the same?

Interestingly, yes! Spirulina has also shown promising results in animal studies. In a 1997 Japanese study, researchers compared chlorella, spirulina, and chlorophyllin to see whether they could help rats eliminate toxic dioxins.
The results were remarkable. Rats fed spirulina excreted 7.1 times more of one particular dioxin, almost identical to the 7.4-fold increase observed with chlorella. Excretion of several other dioxins also increased significantly. link

Does chlorella remove heavy metals too?

There is some promising research. Several animal studies suggest that chlorella may help reduce the absorption of heavy metals such as cadmium, lead, and mercury, while increasing their elimination through feces or urine. We have listed links to these studies below here also.

How long do dioxins stay in the body?

According to the WHO, it takes 7 to 11 years for the amount of dioxins in the body to halve.

How can I lower my dioxin intake?

More than 90% of human exposure to dioxins comes from food, particularly animal products such as meat, dairy, fish, and eggs. Because dioxins are fat-soluble and accumulate in the food chain, animal fats tend to contain much higher concentrations than plant foods. The WHO recommends trimming fat from meat, choosing lower-fat dairy products, and eating a varied diet to reduce exposure.

Plant-based foods generally contain much lower levels of dioxins, making a diet rich in vegetables, fruits, legumes, whole grains, nuts, and seeds a good way to limit intake. Replacing some animal products with plant-based alternatives can further reduce dietary exposure, although contamination levels vary depending on where and how foods are produced.