Support healthy function of the immune system with Cat's Claw liquid extract from Herb Pharm. We prepare our Cat's Claw Extract from the inner bark of Uncaria tomentosa vines which are Custom Wildcrafted by indigenous Indians in the Pucallpa region of the Peruvian Amazon. To assure optimal extraction of Cat's Claw's bioactive compounds, we use only the inner bark which is hand-harvested, carefully sun-dried and cleaned of outer bark, and is then thoroughly extracted. Caution: Seek expert medical advice before taking during pregnancy or if trying to become pregnant.