Journal of Natural Medicines 63(3):351-354. 2009.
Morinda citrifolia Linn. (Rubiaceae) leaf extracts mitigate UVB induced erythema. 
West BJ, Deng S, Palu AK, Jensen CJ.

A carbomer gel base, containing the noni leaf extract and noni leaf juice was not allergenic in a repeat-insult patch test with 49 adult volunteers. The gel also mitigated UVB-induced erythema in 25 adult volunteers.  Noni leaf extract also demonstrated potential anti-inflammatory properties in a histamine H-1 receptor antagonism assay. (original abstract available at