Effects of Oenothera biennis L. and Hypericum perforatum L. extracts on some central nervous system myelin proteins, brain histopathology and oxidative stress in mice with experimental autoimmune encephalomyelitis.
Selek S, Esrefoglu M, Meral I, Bulut H, Caglar HG, Sonuc G, Yildiz C, Teloglu ES, Dogan N, Yuce B, Tiftik E, Bayindir N.
Biotech Histochem. 2019 Feb;94(2):75-83. doi: 10.1080/10520295.2018.1482001.

Evening Primrose (Oenothera biennis) Biological Activity Dependent on Chemical Composition.
Timoszuk M, Bielawska K, Skrzydlewska E.
Antioxidants (Basel). 2018 Aug 14;7(8). pii: E108. doi: 10.3390/antiox7080108. Review.

Antiproliferative and antimicrobial efficacy of the compounds isolated from the roots of Oenothera biennis L.
Singh S, Dubey V, Singh DK, Fatima K, Ahmad A, Luqman S.
J Pharm Pharmacol. 2017 Sep;69(9):1230-1243. doi: 10.1111/jphp.12753.

Comparative analysis of anti-Helicobacter pylori activities of FEMY-R7 composed of Laminaria japonica and Oenothera biennis extracts in mice and humans.
Kim TS, Shin K, Jeon JH, Choi EK, Choi Y, Lee SP, Lee YB, Kim YB.
Lab Anim Res. 2015 Mar;31(1):7-12. doi: 10.5625/lar.2015.31.1.7.

Systematic review: the efficacy of herbal therapy in inflammatory bowel disease.
Ng SC, Lam YT, Tsoi KK, Chan FK, Sung JJ, Wu JC.
Aliment Pharmacol Ther. 2013 Oct;38(8):854-63. doi: 10.1111/apt.12464.

Chemical composition, antioxidative and anti-inflammatory activity of extracts prepared from aerial parts of Oenothera biennis L. and Oenothera paradoxa Hudziok obtained after seeds cultivation.
Granica S, Czerwińska ME, Piwowarski JP, Ziaja M, Kiss AK.
J Agric Food Chem. 2013 Jan 30;61(4):801-10. doi: 10.1021/jf304002h.

Polyphenols from evening primrose ( Oenothera paradoxa ) defatted seeds induce apoptosis in human colon cancer Caco-2 cells.
Gorlach S, Wagner W, Podsedek A, Sosnowska D, Dastych J, Koziołkiewicz M.
J Agric Food Chem. 2011 Jul 13;59(13):6985-97. doi: 10.1021/jf200639e.

Evening primrose oil.
Bayles B, Usatine R.
Am Fam Physician. 2009 Dec 15;80(12):1405-8.