| Acupuncture and acupressure |
| Auricular acupressure | Found to be ineffective22 |
| P6 acupressure | Pressure applied with fingers or a device to the P6 acupressure point (located two or three finger breadths proximal to the wrist crease, midline on the forearm between the large flexor tendon); commonly used but found to be ineffective vs. placebo23 |
| P6 acupuncture | Found to be ineffective vs. no treatment24 |
| Sham acupuncture | Found to be ineffective vs. no treatment24 |
| Traditional acupuncture | Found to be ineffective vs. no treatment or placebo24,25 |
| Herbal therapies | |
| Ginger | Two trials show symptom improvement vs. placebo,26,27 and four trials show symptom improvement similar to that with vitamin B628–31; ginger extract (125 to 250 mg every six hours) should be considered; ginger tea or ginger ale can also be used as adjunctive treatment |
