J Med Assoc Thai. 2010 Dec;93 Suppl 7:S204-9.
Morinda citrifolia Linn. for prevention of postoperative nausea and vomiting.
Prapaitrakool S, Itharat A.

A double-blind, cross-over clinical trial with 100 patients revealed that ingestion of noni fruit extract prior to surgery led to significantly less post-operative nausea. The anti-nausea property was evident at a dose of 600 mg (equivalent to 20g of dried noni fruit).   (view original abstract at https://www.ncbi.nlm.nih.gov/pubmed/21294416).