Chinese Medical Research & Clinical 2008, 6, 8-10.
The effect of Tahitian Noni Juice on antioxidation and immune function. [article in Mandarin]
Ma DL, Jun Z, Jianhua G, et al.

In a two-month, open-label pilot study with human volunteers, Tahitian Noni Juice increased adaptive immune system (IL-2) activity by 32% and innate immune system (NK cell) activity by 30%. It also decreased oxidative stress (malondialdehyde) in the blood by 19%. (Mandarin language abstract available at https://www.chemdrug.com/article/7/376/1875950.html).