Noni (Morinda citrifolia) has a long history of traditional use in Polynesian, Southeast Asian, and other indigenous medicinal systems. Historically, noni fruit, leaves, and roots have been used for a variety of health purposes, including digestive support, immune modulation, and as a general tonic. In traditional Chinese medicine (TCM), the concept of "Spleen" encompasses not only the anatomical organ but also a range of digestive and metabolic functions. While noni is not a classic TCM herb, some practitioners have incorporated it into modern herbal formulations to support "Spleen Qi" or improve digestive health, likely influenced by its general traditional use for digestive complaints.

Scientifically, there is limited direct evidence linking noni to specific support of the spleen or its functions. Some in vitro and animal studies suggest noni extracts might have immunomodulatory, antioxidant, and anti-inflammatory properties, which could theoretically benefit overall health, including organs of the immune system like the spleen. However, there is a lack of controlled human trials specifically examining noni’s effects on spleen function or health. Therefore, its use for supporting the spleen is primarily based on tradition and general health claims rather than robust scientific validation.