Cat's Claw Inner Bark is actually a vine. This extract is a wonderful anti-inflammatory and immune booster. It is also very useful in treating many ailments including: ulcers, viral infections, asthma and arthritis. Cat's Claw helps to protect joint cartilage. The main benefit of Cat's Claw is the relief it provides for aching joints and can even be used by persons suffering from rheumatoid arthritis. The Cat's Claw helps to protect joint cartilage.