Millions of patients have benefited from chiropractic care. Perhaps the most popular with patients are the pain relief benefits offered by chiropractic. A recent study evaluated modifications in blood enzymes before and after a five week stint of twice a week chiropractic spinal adjustments for individuals suffering from nonspecific chronic neck or back pain. After five weeks of the spinal adjustments researchers found a measurable elevation in certain blood enzymes. Specifically, they found significant increases in the antioxidant enzymes superoxide dismutase and glutathione peroxidase. Other studies have shown a relationship between pain and these sorts of enzymes. Researchers believe the changes measured in enzymes could be related to the analgesic effective that chiropractic adjustments have on the body.