Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Luo San (sometimes referred to as "luo han guo" or monk fruit) has a long history of use in Traditional Chinese Medicine (TCM) for treating colds, sore throat, coughs, and other upper respiratory symptoms. Historical TCM texts describe its properties as "cooling" and effective for clearing heat and moistening the lungs, which aligns with the traditional understanding of addressing symptoms associated with colds, such as sore throat and congestion. Luo San preparations are often consumed as herbal teas or lozenges to soothe throat irritation and relieve cough.

However, scientific validation for these uses is limited. Most research on Luo San has focused on its sweetening compounds, such as mogrosides, and their anti-inflammatory or antioxidant effects. Some laboratory studies suggest that extracts from the fruit may have anti-inflammatory or expectorant properties, but rigorous clinical trials in humans specifically evaluating its efficacy as a decongestant or remedy for colds are lacking. Thus, while Luo San's use for colds is well-rooted in traditional practice, the available scientific evidence supporting its decongestant effect is weak to modest at best, warranting a rating of 2.

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