Post-Herpetic Neuralgia  Acupuncture  Magnetic Therapy  Nutritional Approaches Complementary Approaches Magnetic Therapy The evidence that biomagnets can produce analgesia in chronic pain is slight, but some studies suggest that there may be benefit in neuropathic conditions such as peripheral neuropathies and post-polio pain syndrome (Weintraub, 1998, 1999). They have not, however, been studied specifically for the pain of PNH.