Cat\u2019s claw is a medicinal herb traditionally used to stimulate the immune system. Research has shown it may boost immune function, reduce inflammation, and even help with chemotherapy. Read on to discover the potential health benefits and adverse effects associated with this herb.<\/p>\n
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Cat\u2019s claw (Uncaria tomentosa<\/em>) is a medicinal plant that grows in the Amazonian rainforest and other tropical areas in Central and South America. The use of the herb dates back to the Inca civilization. Indigenous cultures of South America used cat\u2019s claw for inflammation, cancer, viral infections, ulcers, and to stimulate the immune system [R<\/a>, R<\/a>].<\/p>\n It gets its name from its thorns, which resemble the claws of cats.<\/p>\n Cat\u2019s claw can refer to Uncaria tomentosa<\/em> and Uncaria guianensis<\/em>. Most commercial preparations such as teas, tablets, and capsules contain U. tomentosa<\/em><\/strong> [R<\/a>, R<\/a>, R<\/a>].<\/p>\n The two different types of cat\u2019s claw contain different active compounds and have different medicinal properties. Uncaria tomentosa <\/em>contains more pentacyclic oxindole alkaloids (POAs), while U<\/em>. guianensis <\/em>is richer in tetracyclic oxindole alkaloids (TOAs) [R<\/a>, R<\/a>].<\/p>\n TOAs act on the central nervous system (brain and spinal cord), whereas POAs affect the immune system [R<\/a>].<\/p>\n TOAs cancel out the effects of POAs. Therefore it is important when purchasing and consuming cat\u2019s claw extracts to be sure that they have been tested for TOA and POA levels <\/strong>[R<\/a>].<\/p>\n Differences between the two types are conveyed in the chemical structure. Pentacyclic alkaloids are found in the vine bark while tetracyclic alkaloids are found in the leaves and stem of the plant [R<\/a>, R<\/a>].<\/p>\n Cat\u2019s claw is rich in three major groups of chemical compounds: alkaloids, terpenoids, and flavonoids [R<\/a>].<\/p>\n Specific compounds found in cat\u2019s<\/a> claw include:<\/p>\n Cat\u2019s claw:<\/p>\n Cat\u2019s claw\u2019s anti-inflammatory effects have been commonly used to treat both rheumatoid arthritis and osteoarthritis [R<\/a>].<\/p>\n In a clinical trial on 40 rheumatoid arthritis patients, cat\u2019s claw combined with conventional treatments (sulfasalazine\/hydroxychloroquine) reduced tender and painful joints<\/strong> [R<\/a>].<\/p>\n In another trial of 45 people with knee osteoarthritis, one week of cat\u2019s claw reduced pain associated with activity. In another trial on 95 people, a dietary supplement with 300 mg cat\u2019s claw and 1500 mg maca improved joint pain, stiffness, and function as effectively as the more common supplement glucosamine sulfate [R<\/a>].<\/p>\n Cat\u2019s claw extract increased IGF-1<\/a> levels in human cartilage cells, which might help to maintain cartilage health and prevent cartilage breakdown. In animal and cell-based studies, cat\u2019s claw blocked IL-1\u03b2<\/a> and other inflammatory molecules that suppress IGF-1 production [R<\/a>, R<\/a>, R<\/a>].<\/p>\n The different compounds in cat’s claw supposedly act together to achieve these effects [R<\/a>].<\/p>\n Mitraphylline blocks the release of inflammatory molecules such as IL-1, IL-4<\/a>, and IL-17<\/a>, and TNF-alpha<\/a> [R<\/a>].<\/p>\n Other pentacyclic oxindole alkaloids cause the release of a currently unidentified immune regulating factors that may reduce arthritic joint pain <\/strong>[R<\/a>, R<\/a>].<\/p>\n Quinic acid decreases inflammatory molecules like NF-\u03baB [R<\/a>, R<\/a>, R<\/a>].<\/p>\n Although limited, the existing evidence suggests that cat\u2019s claw may help with the symptoms of both rheumatoid arthritis and osteoarthritis. You may discuss with your doctor if it could be useful as an adjuvant therapy in your case. Never take cat\u2019s claw in place of what your doctor recommends or prescribes for arthritis.<\/p>\n In a study of 31 volunteers with cold<\/a> sores (herpes labialis), cat\u2019s claw was more effective in reducing symptoms such as swelling, skin reddening, and pain compared to prescription antiviral drug Acyclovir [R<\/a>].<\/p>\n In a cell-based study, cat\u2019s claw extract prevented the spread of the herpes virus by preventing it from attaching to cells [R<\/a>].<\/p>\n In another trial on 261 people, immunostimulation with a natural product containing cat\u2019s claw and other herbal extracts reduced the incidence of anal warts (caused by infections with the human papillomavirus) after a surgical procedure [R<\/a>].<\/p>\n Cat’s claw also prevented immune cells from being infected with dengue virus and reduced inflammatory cytokines TNF-alpha and IFN-alpha [R<\/a>].<\/p>\n Although the results are promising, two clinical trials and some animal and cell-based research cannot be considered sufficient evidence to support the use of cat\u2019s claw for viral infections. Further clinical research is needed.<\/p>\n In a study of 40 breast cancer patients undergoing chemotherapy, 300 mg cat’s claw extract prevented a decrease in white blood cells<\/a> (neutropenia) and repaired DNA damage. However, the same dose was ineffective in another trial on 43 people with colorectal cancer [R<\/a>, R<\/a>].<\/p>\n In a clinical trial on 51 people with advanced cancer, cat\u2019s claw reduced fatigue and improved quality of life [R<\/a>].<\/p>\n In rats who received chemotherapy, cat’s claw increased white blood cell count and helped repair damaged DNA [R<\/a>].<\/p>\n Cat\u2019s claw also stimulates the growth of progenitor cells in mice, which can replace damaged cells and reduce the damaging effects of chemotherapy [R<\/a>].<\/p>\n Again, 3 clinical trials (with mixed results) and some animal research are insufficient to claim that cat\u2019s claw may help fight cancer. Larger, more robust clinical trials are needed.<\/p>\n Cat\u2019s claw can cleanse the digestive tract and is claimed to help treat inflammatory gut disorders including [R<\/a>]:<\/p>\n In a clinical trial on 50 people with gum inflammation, a gel with cat\u2019s claw was as effective as an antifungal (miconazole) at reducing the counts of infectious yeasts [R<\/a>].<\/p>\n Cat’s claw protected against stomach inflammation in rats and prevented TNF-\u03b1<\/a> production and cell death [R<\/a>].<\/p>\n Bacterial toxins also cause the release of inflammatory molecules like NF-\u03baB<\/a> and TNF-\u03b1. Cat\u2019s claw blocked the release of these inflammatory molecules in mice [R<\/a>].<\/p>\n Inflammation of the gut is also caused by toxic free radicals (peroxynitrite). Cat\u2019s claw broke down free radicals and reduced cell death caused by gut bacterial toxins<\/strong> [R<\/a>].<\/p>\n While only a small trial investigated cat\u2019s claw for gum inflammation, its effects on inflammation of the digestive system have only been tested in animals. Further clinical research is required to confirm these preliminary findings.<\/p>\n Cat\u2019s claw may enhance the immune system by increasing the levels of key immune cells<\/strong> (T helper and B cells) and the activity of granulocytes<\/a> [R<\/a>, R<\/a>, R<\/a>, R<\/a>].<\/p>\n In a small trial on 23 healthy volunteers, a cat\u2019s claw extract enhanced the immune effects of a vaccine against pneumococcal infections. The extract increased the relative abundance of immune cells (lymphocytes) and prolonged the antibody titer response of the vaccine [R<\/a>].<\/p>\n Again, only a small clinical trial and some animal and cell-based research have investigated this potential benefit of cat\u2019s claw. More clinical trials on larger populations are warranted.<\/p>\n Two different traditional Chinese medicines with cat\u2019s claw and other herbs (Jiangzhuo Qinggan and Qian Yang He Ji) lowered blood pressure in clinical trials on almost 300 people. However, another remedy combining cat\u2019s claw and potato orchid (Gastrodia) was ineffective and used as the negative control in another trial on 79 people [R<\/a>, R<\/a>, R<\/a>].<\/p>\n Cat\u2019s claw contains a compound called hirsutine<\/strong> that reduces blood pressure. It acts as a calcium<\/strong><\/a> channel blocker<\/strong> in the heart and blood vessels, which slows down the heart rate and relaxes the blood vessels [R<\/a>, R<\/a>, R<\/a>].<\/p>\n Because the only clinical trials tested herbal mixes containing cat\u2019s claw and other extracts (with mixed results), we cannot establish if the effects observed were due to this specific ingredient, More clinical trials using cat\u2019s claw alone are needed to shed some light on this potential use.<\/p>\n No clinical evidence supports the use of cat\u2019s claw for any of the conditions listed in this section. Below is a summary of the existing animal and cell-based research, which should guide further investigational efforts. However, the studies should not be interpreted as supportive of any health benefit.<\/p>\n Cat\u2019s claw has been traditionally used to treat<\/strong> diabetes<\/strong> [R<\/a>].<\/p>\n Its extract reduced blood sugar levels and inflammation and prevented diabetes in mice whose insulin<\/a>-releasing cells (beta-cells) were damaged [R<\/a>].<\/p>\n Cat\u2019s claw protected red blood cells (<\/strong>RBCs) from damage due to toxins and reduced oxidative stress<\/a>. It also prevented cell death and oxidative stress<\/a> in RBCs exposed to pesticides [R<\/a>, R<\/a>, R<\/a>].<\/p>\n Procyanidins and other polyphenols in cat\u2019s claw scavenged and remove oxidative radicals<\/strong> in cell-based studies [R<\/a>].<\/p>\n Cat’s claw also blocked the production of the inflammatory cytokine TNF-\u03b1 and prevented cell death [R<\/a>].<\/p>\n This list does not cover all possible side effects. Contact your doctor or pharmacist if you notice any other side effects. <\/em><\/p>\n Call your doctor for medical advice about side effects. In the US, you may report side effects to the FDA at 1-800-FDA-1088 or at <\/em>www.fda.gov\/medwatch<\/em><\/a>. In Canada, you may report side effects to Health Canada at 1-866-234-2345.<\/em><\/p>\n Cat\u2019s claw is generally considered safe<\/strong>. The main side effects reported in clinical trials were usually mild and included [R<\/a>, R<\/a>]:<\/p>\n Pregnant women<\/strong> should avoid<\/strong> using cat\u2019s claw because of the herb\u2019s potential to cause abortion [R<\/a>].<\/p>\n Because cat\u2019s claw seems to enhance the immune response by increasing the activity of immune cells, this supplement may increase the symptoms of autoimmune disorders<\/strong>. People with autoimmune conditions should be especially cautious with cat\u2019s claw and never take it without discussing it with their doctors [R<\/a>].<\/p>\n Cat\u2019s claw decreased molecules that activate clotting (IL-1<\/strong><\/a>\u03b1, 1\u03b2, 4, 17<\/strong>, and TNF<\/strong><\/a>-\u03b1<\/strong>). People with blood clotting disorders or on blood thinners should avoid cat\u2019s claw to reduce the risk of bleeding and bruising<\/strong> [R<\/a>, R<\/a>].<\/p>\n When cat’s claw was used in combination with some HIV treatments like protease inhibitors (atazanavir, ritonavir, and saquinavir), it increased their toxicity [R<\/a>].<\/p>\n Few high-quality clinical trials with cat\u2019s claw have been conducted in humans. More studies are needed to confirm its health benefits.<\/p>\n Cat\u2019s claw was sometimes tested as part of multi-herbal complexes, making its specific contribution to the effects observed difficult to estimate.<\/p>\n Because cat\u2019s claw is not approved by the FDA for any conditions, there is no official dose. Users and supplement manufacturers have established unofficial doses based on trial and error. Discuss with your doctor if cat\u2019s claw may be useful in your case and which dose you should take.<\/p>\n Clinical trials have used between 80 – 350 mg of cat\u2019s claw extract. These extracts usually contained a certain amount of pentacyclic oxindole alkaloids, rather than tetracyclic oxindole alkaloids.<\/p>\n The opinions expressed in this section are solely those of cat\u2019s claw users, who may or may not have medical or scientific training. Their reviews do not represent the opinions of SelfHacked. SelfHacked does not endorse any specific product, service, or treatment.<\/em><\/p>\n Do not consider user experiences as medical advice. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare providers because of something you have read on SelfHacked. We understand that reading individual, real-life experiences can be a helpful resource, but it is never a substitute for professional medical advice, diagnosis, or treatment from a qualified healthcare provider.<\/em><\/p>\n Several users reported satisfactory results when using cat\u2019s claw for arthritis, digestive inflammation, and infections.<\/p>\n A doctor claimed using cat\u2019s claw on 150 patients during the last 4 years and obtaining better results than with any other available products.<\/p>\n<\/a>Main Beneficial Compounds of Cat\u2019s Claw<\/span><\/h3>\n
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<\/a>Mechanisms of Action<\/strong><\/span><\/h3>\n
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<\/a>Health Benefits<\/strong><\/span><\/h2>\n
<\/a>Possibly Effective for:<\/span><\/h3>\n
<\/a>Arthritis<\/strong><\/span><\/h3>\n
<\/a>Insufficient Evidence for:<\/strong><\/span><\/h3>\n
<\/a>1) Viral Infections<\/strong><\/span><\/h3>\n
<\/a>2) Add-On to Anticancer Therapy<\/strong><\/span><\/h3>\n
<\/a>3) Stomach and Gut Inflammation<\/strong><\/span><\/h3>\n
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<\/a>4) Boosting the Immune System<\/strong><\/span><\/h3>\n
<\/a>5) High Blood Pressure<\/strong><\/span><\/h3>\n
<\/a>Animal and Cell Research (Lack of Evidence)<\/strong><\/span><\/h3>\n
<\/a>Diabetes<\/strong><\/span><\/h3>\n
<\/a>Protecting Red Blood Cells<\/strong><\/span><\/h3>\n
<\/a>Antioxidant and Anti-inflammatory<\/strong><\/span><\/h3>\n
<\/a>Side Effects and Precautions, Limitations & Dosage<\/strong><\/span><\/h2>\n
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<\/a>Limitations<\/strong><\/span><\/h3>\n
<\/a>Dosage<\/strong><\/span><\/h3>\n
<\/a>Experiences with Cat\u2019s Claw<\/strong><\/span><\/h3>\n