Alpha-lipoic acid (ALA) is a possible alternative remedy to treat the pain associated with diabetic polyneuropathy. Neuropathy, or nerve damage, is a common and potentially serious complication of diabetes. Nerve damage is permanent, and its symptoms can be difficult to alleviate. Polyneuropathy involves the peripheral nerves of the body. It’s the most common form of neuropathy in people who have diabetes, and it causes foot and leg pain.