Aromatherapy with peppermint, isopropyl alcohol, or placebo is equally effective in relieving postoperative nausea. – Cost Effective Supplements

Aromatherapy with peppermint, isopropyl alcohol, or placebo is equally effective in relieving postoperative nausea.

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Link to full study

http://www.ncbi.nlm.nih.gov/pubmed/14770380

Conclusion of this study

Overall satisfaction with postoperative nausea management was 86.9 +/- 4.1 mm and was independent of the treatment group. Aromatherapy effectively reduced the perceived severity of postoperative nausea. The fact that a saline "placebo" was as effective as alcohol or peppermint suggests that the beneficial effect may be related more to controlled breathing patterns than to the actual aroma inhaled.