Chinese Mallow (Malva verticillata), known as "Ku Kui Cai" in Traditional Chinese Medicine (TCM), is primarily used in TCM for its purported cooling and detoxifying properties, with traditional applications focusing on promoting urination, relieving edema, and soothing the throat. References to its use for nausea and vomiting do exist in some traditional sources, but these are not prominent or well-documented compared to its other uses. There is a lack of high-quality clinical trials or rigorous scientific studies that specifically examine the efficacy of Chinese Mallow in treating or supporting nausea and vomiting. The evidence supporting its use for this purpose is based on traditional herbal formulas where it may be included as a minor ingredient, often in combination with other herbs that have a more established role in managing gastrointestinal discomfort.

Modern scientific literature does not provide substantial research or pharmacological data confirming antiemetic effects for Malva verticillata. The available evidence is thus largely anecdotal or rooted in traditional practice, rather than validated by controlled studies. As such, the justification for using Chinese Mallow to support or treat nausea and vomiting is primarily traditional, and the strength of evidence is weak.