COUNTRY EXPLORER / PERU / RESEARCH BRIEF
Peru
Cat’s claw: species, supportive-care questions and joint symptoms
Evidence at a glance
A focused botanical research brief, with cancer first and other chronic disease and health questions afterward. Country labels provide geographic context; plants and traditions cross borders, and some studies were conducted elsewhere. This is a selected evidence review, not a national disease-burden survey or a treatment guide.
Cancer
Cat’s claw during chemotherapy
Small human studies · conflicting supportive-care findings. In a Brazilian study of 40 women receiving adjuvant breast-cancer chemotherapy, an Uncaria tomentosa extract was associated with less neutropenia and less measured DNA damage in blood cells. The small, non-placebo-controlled study does not establish fewer infections, improved survival or tumor control. Its location matters: this is research on an Amazonian plant associated with Peru, not a Peruvian cancer trial. Breast-cancer study
A separate study in 43 people receiving FOLFOX4 for colorectal cancer did not find improvements in the blood, immune or oxidative-stress measures assessed. These divergent findings are a reason for better trials, not a basis for recommending the extract during chemotherapy. Colorectal-cancer study
Other chronic disease and health
Knee osteoarthritis and the species problem
Short randomized trial · symptom signal. A four-week study in 45 people compared Uncaria guianensis with placebo and reported improvement in pain during activity, but not in pain at rest or at night, or knee circumference. This was a different species from the cancer studies. The result does not demonstrate cartilage repair or establish a long-term treatment. Osteoarthritis trial
“Uña de gato” is a common name, not a precise formulation. Botanical identity, extraction method and chemical composition matter when comparing a community preparation with a research product.
Clinical interpretation and safety
The US National Center for Complementary and Integrative Health finds no conclusive clinical evidence supporting cat’s claw for any health condition. It may stimulate the immune system and worsen autoimmune disease; clotting effects and possible interactions with blood-pressure or blood-thinning medicines also require care. Pregnancy may be unsafe. NCCIH evidence and safety summary
What would change the picture? Replicated trials using a clearly identified species and standardized product, with meaningful outcomes such as infections or sustained joint function. Compatibility with an individual cancer regimen should be assessed by the oncology team; these studies do not establish it.
Research checked: 23 October 2026. Study preparations are described to distinguish the evidence, not to recommend self-treatment. Botanical illustration is interpretive.
