* Hypericum might have [[wp:Monoamine oxidase inhibitor|MAO-inhibiting]] and/or [[wp:COMT inhibitor|COMT-inhibiting]] properties.

* Many studies reported that hypericin is the main source of pharmacological effects of hypericum. However the IC50 of hypericin to inhibit MAO A and MAO B is 100- to 1000-fold higher than accessible Cmax values of hypericin after oral administration of hypericum.<ref name ="Wurglics2006">{{Pubmed|16640452|Wurglics M, Schubert-Zsilavecz M.Hypericum perforatum: a 'modern' herbal antidepressant: pharmacokinetics of active ingredients. Clin Pharmacokinet. 2006;45(5):449-68.}}</ref>