Peppers are a nightshade vegetable. As such, I recommend that clients with arthritis, bone degeneration, or joint pain to avoid peppers in their diet. However, for those who can enjoy peppers freely, summer is an ideal season for them thanks to their cooling properties and the sweet taste of the orange, red, and yellow bell peppers. Peppers offer as much vitamin C as oranges. They also contain high levels of vitamins A and B, and therefore may assist the immune system. Other nutritional benefits include potassium, niacin, and folic acid. "The chiles and cayenne peppers contain capsaicin, with medicinal properties in cleansing the blood and stimulating the circulation and perhaps in reducing cardiovascular disease and cancer. They also stimulate the gastric secretions and help digestion." Elson M. Haas, MD. Purchase peppers in organic varieties to avoid heavily laden pesticide use.