
Pao Pereira Benefits: Side Effects, Dosage, and How to Use
Pao Pereira is a herbal preparation that has received a lot of attention recently. In the study The plant extract of Pao Pereira potentiates carboplatin effects against ovarian cancer (Jun Yue & Qi Chen, 2013), the test used this nutrient on mice and obtained results of inhibiting tumor growth by 79% while reducing the volume of ascites by 55%. At the same time, combined with carboplatin, tumor inhibition reached 97% and ascites were completely eliminated [1].
So, is it effective when applied to the human body? What is Pao Pereira that brings such miraculous effects?
Before exploring further, please read the disclaimer located at the end of this webpage.
Key Takeaways
- Pao Pereira has been used for many years to improve digestive disorders, protect liver health, increase resistance, etc.
- Pao Pereira can be taken in capsule/tablet form, drunk as tea or used as a solution.
- The recommended dosage is around 10 - 50 mg/kg/day but you should consult your doctor/nutritionist before using.
What Is Pao Pereira?
Pao Pereira is a tree in the Apocynaceae family, native to South America, mainly growing in the Brazilian Amazon. This plant is known by many different names such as Bergibita, Geissospermum vellosii, Geissospermum laeve, Pau Pereira and Brazilian Pear.
The tree can reach a height of 80 feet and a diameter of 3-4 feet. The trunk is light brown to yellow with alternate leaves, and the fruit is horn-shaped, yellow when ripe. At the same time, the tree secretes latex from the fruit and the tips of the branches.
The main part exploited for medicine is the trunk, so many people may feel a little uncomfortable because the plant has a strong earthy smell and a slightly bitter taste [2].
For hundreds of years, decoctions from Pao Pereira have been widely used for centuries to enhance immune health. In 1848, Ezequiel Correa Dos Santos - a member of the Spanish Oriental Medicine Association presented the first official monograph on the benefits of Pao Pereira. Moreover, in the 20th century, this plant was recommended as a tonic and antipyretic in Milan, Italy.

Pao Pereira’s Biological Mechanisms of Action
Pao Pereira extract has been shown to inhibit NFκB signaling (*). This results in a dramatic reduction in tumor cell proliferation and apoptosis in prostate cancer cells.
In addition, Pao Pereira also has the ability to inhibit Wnt/β-catenin activity (**) to prevent cancer stem cells from continuing to produce more harmful cells [3].
In fact, in a study of Pao Pereira’s effects on animals, geissospermum, an alkaloid - the most popular Pao Pereira herbal preparation, has the ability to inhibit acetylcholinesterase - an indispensable enzyme if you want to treat Alzheimer’s disease.
Thereby increasing the concentration of the neurotransmitter acetylcholine and reducing memory loss caused by scopolamine [4].
(*) NFκB is a “tool” that regulates immune reflexes in the body. For example, when a foreign factor such as bacteria or virus attacks, NFκB starts to work strongly to help the body fight against harmful agents and eliminate them from the body [5].
(**) Wnt/β-catenin is a key cellular signaling pathway involved in controlling cell growth and regeneration. Proper regulation of this pathway helps maintain healthy tissue function and reduces the risk of disease. [5]
Pao Pereira Benefits for Human Health

Immune System Support
The bark of the Pao Pereira tree is rich in indole alkaloids (an organic compound belonging to the alkaloid group), which is notable for its strong anticholinesterase activity (an enzyme found in the liver, pancreas, heart, plasma and white matter of the brain).
This is the basis for proving the effectiveness of increasing the body's natural resistance after use against harmful factors from the environment. However, the temporary study is only on animals (applied on classic mice), so the immune-enhancing effect of Pao Pereira still needs to be considered further [6].
Anti-Parasitic Effects
As the study Extract of the Medicinal Plant Pao Pereira Inhibits Pancreatic Cancer Stem-Like Cell In Vitro and In Vivo (Ruochen Dong et al., 2018) found that Pao Pereira extract has the ability to resist the rapid proliferation of cancer cells - where harmful parasites are present [2].
At the same time, Jun Yu in the study The plant extract of Pao pereira potentiates carboplatin effects against ovarian cancer (2013) demonstrated that the combination of Pao Pereira and carboplatin forms a major chemotherapy drug for ovarian cancer.
Thanks to that, the formation of tumor cell colonies in soft agar to eliminate tumors in a short time. This implicitly confirms the ability to effectively fight harmful microorganisms in the body, but note that the study is only applied on animals (mice), so in general, the results still need more time to be seen [1].
Digestive System Benefits
For many years, both water and alcohol decoctions of Pao pereira (the bark of the tree) have been used in folk medicine to help relieve digestive disorders. This has been confirmed in the study Somatostatin analogues for the treatment of enterocutaneous fistulas: a systematic review and meta-analysis (Shaun Coughlin et al., 2012).
Specifically, this natural ingredient contains bioactive compounds that reduce inflammation in the gastrointestinal (GI) tract while fighting Helicobacter pylori bacteria - the leading cause of gastritis and stomach ulcers.
This can soothe irritated stomach lining, allowing the digestive system to absorb nutrients more effectively without feeling heavy.
Liver Support
As mentioned above, Pao pereira is rich in indole alkaloids (mainly flavopereirine) with strong antioxidant properties, which can protect liver cells from damage.
In addition, the nutrients in flavopereirine also have impressive anti-inflammatory properties and regulate inflammatory cytokines in liver tissue. Thanks to that, the body is comprehensively protected against inflammatory factors.
Other Uses
In addition to the above uses, we must also mention another impressive effect of improving concentration and preventing diseases related to neurological dysfunction.
This can be simply explained when we all know that this ingredient has strong anti-inflammatory and antioxidant properties. Thereby helping to reduce oxidative stress in nerve cells, thereby optimally preventing the risk of causing neurodegenerative diseases such as Alzheimer's and Parkinson's.
Pao Pereira Side Effects
Although the alkaloid component has strong antioxidant and anti-inflammatory properties, did you know that it is a "poison"? The reason is that Alkaloids contain nitrogen (N), which is synthesized by many organisms such as bacteria, fungi, etc. to protect plants from attacks from harmful bacteria.
But this is also the way to fight harmful microorganisms by secreting toxins, so if people use it incorrectly, it will cause more harm than the great benefits mentioned above. Accordingly, if used in excess or incorrectly, it can lead to side effects such as fatigue, headache, nausea, etc.
How Much Pao Pereira Should You Take?
Currently, there is no research showing the amount of Pao Pereira that humans can use because, as you know, the benefits of this nutrient still need to be studied further. However, through the following studies, you can also temporarily determine the level of Pao Pereira extract needed:
- Extract of the Medicinal Plant Pao Pereira Inhibits Pancreatic Cancer Stem-Like Cell In Vitro and In Vivo mentioned 20 mg/kg, 5 times/week has the ability to significantly reduce cancer cells [2].
- Beta-carboline alkaloid-enriched extract from the amazonian rain forest tree pao Pereira suppresses prostate cancer cells mentioned 10 or 20 mg/kg/day is the ideal level if you want to destroy your own tumor [7].
- The plant extract of Pao Pereira potentiates carboplatin effects against ovarian cancer mentioned 20 or 50 mg/kg/day by ip injection can help you eliminate ovarian cancer cells and prevent metastasis from progressing too quickly to the remaining organs [1].
Combining the above information, we can see that the ideal level of Pao Pereira is 20 mg/kg/day. But when you first start, you should use a small amount to see how your body reacts, about 10 mg/kg/day.
Then gradually increase to a maximum of 50 mg/kg/day. But first, don't forget to contact your doctor or nutritionist, present your health condition to get advice on the appropriate Pao Pereira supplement and dosage.
Risks and Pao Pereira Interactions

As mentioned above, Pao Pereira can cause some mild side effects such as headache, nausea, dizziness, ... if overdosed or used incorrectly. In some cases of allergy to the ingredients in Pao Pereira, you are likely to also experience fatigue, anxiety, dizziness, rash,...
At the same time, abusing Pao Pereira as a panacea is absolutely not recommended. Because this can put more burden on the liver or aggravate the immune resistance. In addition, using high doses of Pao Pereira can also cause blood pressure to drop rapidly.
How to Take Pao Pereira
Currently, there are many ways to supplement Pao Pereira for the body such as taking capsules/tablets, drinking tea, using powder,... Each type has its own advantages and limitations. In which:
- For capsules/tablets: The dosage is predetermined, just used according to instructions and easy to absorb. However, the cost can be quite high because it takes a long time to process the ingredients and produce the finished product.
- For tea form: The advantage of 100% natural extraction, easy to use, easy to adjust the dosage cannot be denied, but it has a bitter, strong taste.
- For liquid form (solution): There are many outstanding features such as easy absorption, high efficiency, strong taste, easy to mix, but note that there may be a burning sensation.
In general, choosing which type of supplement depends on each person's needs, preferences, and desires. For example, if you need to find a convenient, easy-to-use product, consider capsules/tablets.
But if you want high efficiency, consider the liquid form. If you want to slowly enjoy the nutrients, have a comfortable experience, without the pressure of taking medicine, don't ignore the tea form.
Nowadays, Pao Pereira is also available in the United States as a dietary supplement. Thanks to its active compounds, it is primarily used to support immune health and promote anti-aging benefits. Most Pao Pereira supplements are offered in capsule form, featuring a variety of formulations.
Some products combine Pao Pereira with other well-known herbs like Pau D’Arco and Astragalus, both recognized for their antioxidant properties and additional support for immune function and healthy aging.
Conclusion
The above are undeniable benefits of Pao Pereira such as increasing resistance, limiting digestive disorders, anti-aging, improving liver function,... But no matter what, you need to be careful when using it to ensure safety by contacting a doctor or nutritionist for advice on suitable products.
References
- [1] Yu, J., & Chen, Q. (2013). The plant extract of Pao pereira potentiates carboplatin effects against ovarian cancer. Pharmaceutical Biology, 52(1), 36–43. https://doi.org/10.3109/13880209.2013.808232.
- [2] Dong, R., Chen, P., & Chen, Q. (2018). Extract of the Medicinal Plant Pao Pereira Inhibits Pancreatic Cancer Stem-Like Cell In Vitro and In Vivo. Integrative Cancer Therapies, 17(4), 1204–1215. https://doi.org/10.1177/1534735418786027.
- [3] Mbeunkui, F., Grace, M. H., Lategan, C., Smith, P. J., Raskin, I., & Lila, M. A. (2012). In vitro antiplasmodial activity of indole alkaloids from the stem bark of Geissospermum vellosii. Journal of Ethnopharmacology, 139(2), 471–477. https://doi.org/10.1016/j.jep.2011.11.036.
- [4] Lima, J. A., Costa, R. S., Epifânio, R. A., Castro, N. G., Rocha, M. S., & Pinto, A. C. (2009). Geissospermum vellosii stembark. Pharmacology Biochemistry and Behavior, 92(3), 508–513. https://doi.org/10.1016/j.pbb.2009.01.024.
- [5] Pao pereira. (2021, January 29). Retrieved April 18, 2025, from Memorial Sloan Kettering Cancer Center website: https://www.mskcc.org/cancer-care/integrative-medicine/herbs/pao-pereira.
- [6] LIMA, J. A., COSTA, T. W. R., SILVA, L. L., MIRANDA, A. L. P., & PINTO, A. C. (2016). Antinociceptive and anti-inflammatory effects of a Geissospermum vellosii stem bark fraction. Anais Da Academia Brasileira de Ciências, 88(1), 237–248. https://doi.org/10.1590/0001-3765201520140374.
- [7] Bemis. (2019). beta-carboline alkaloid-enriched extract from the amazonian rain forest tree pao pereira suppresses prostate cancer cells. Journal of the Society for Integrative Oncology, 7(2). Retrieved from https://pubmed.ncbi.nlm.nih.gov/19476740.
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