Cat's claw - plant growing wildly in the Amazonian rainforests of South and Central America, and have been used by local people for different health conditions for centuries. 
Uncaria Tomentosa (Cat’s Claw, Una de Gato) is a well-researched plant with a wide range of active valuable compounds. Cat’s claw contains several active compositions including sitosterols, rutin, chlorogenic acid, catechin, epicatechin, hirsutine, oleanolic acid, procyanidins and uncarine. Other reports revealed that compounds other than oxindole alkaloids, such as rotundifoline, coumarins, flavonoids, quinovic acid glycosides and triterpenes may be responsible for the Cat’s claw therapeutic effects. 
Existing studies show that Cat’s claw may benefit at wide range of health problems, including immune system deficiencies, cancer, lung diseases, neurodegenerative disorders, chronic fatigue syndrome, liver fibrosis, gut disorders (irritable and leaky bowel syndrome), digestive complaints, parasitic and microbial infections, kidney conditions, joint issues, and other inflammatory problems. [1, 2, 3]
Cat's claw has been used as a traditional medicine by the indigenous peoples of the Amazonian rainforest for at least 2000 years to cure fever, infections, wounds, menstrual irregularity, joints inflammation and many other conditions and illnesses, like tumors, gastric ulcers and arthritis. It was used also for skin healing, lung conditions, contraception, urinary tract infections, rheumatism and weakness. Additionally, it was used as a treatment option for mental disorders. This is the reason this plant is also known as the "life-giving vine of Peru".
Cat’s claw is a liana deriving its name from small curved-back thorns that resemble the claws of a cat. It is widely distributed in the Peruvian Amazonian rainforest and some other areas of South and Central America.
1. Uncaria tomentosa (Willd. ex Schult.) DC.: A Review on Chemical Constituents and Biological Activities. Appl. Sci. 2020, 10, 2668; doi:10.3390/app10082668.
2. Assessment report on Uncaria tomentosa (Willd. ex Schult.) DC., cortex. Committee on Herbal Medicinal Products (HMPC). 2015. EMA/HMPC/259598/2014.
3. Yepes-Perez AF,Herrera-Calderón O, Oliveros CA, et al. The Hydroalcoholic Extract of Uncaria tomentosa (Cat's Claw) Inhibits the Infection of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) In Vitro. Evid Based Complement Alternat Med. 2021;2021:6679761. Published 2021 Feb 24. doi:10.1155/2021/6679761