Study	Reason for exclusion
Adriazola Semino 1992	SR versus active control (Prazosin). No indication of randomization.
Al‐Shukri 2000	Not randomized.
Aliaev 2009	Men had chronic abacterial prostatitis.
Authié 1987	Not an RCT.
Comar 1986	Study duration unknown.
Di Silverio 1992	Tissue study investigating the antiestrogenic effect of SR versus placebo.
Gerber 1998	Open‐label study, no control group.
Giannakopoulos 2002	No control.
Grasso 1995	Average treatment duration < than 1 month.
Pavone 2010	Not an RCT.
Pecoraro 2004	No relevant outcomes.
Popa 2005	Re‐analysis of the included study Metzker 1996. Wirksamkeit eines sabal‐urtica‐kombinationspraparates bei der behandlung der benignen prostatahyperplasie (BPH). Der Urologe B 1996;36(4):292‐300.
Sinescu 2011	Not an RCT.
Sivkov 2001	Same as Lopatkin 2005.
Stepanov 1999	No control.
Strauch 1994	Enzyme study (inhibition of 5 alpha‐reductase) comparing SR versus finasteride in a 1 week, open, randomized, active‐controlled study.
Vela‐Navarrete 2003	Dual publication.
Vela‐Navarrete 2005	No relevant outcomes comparing Permixon® to control.
Veltri 2002	No clinical outcomes.
Vinarov 2010	No active or placebo control.
Weisser 1997	Enzyme study investigating the influence of Sabal serrulata (versus placebo) on epithelial and stromal enzyme activities of BPH tissue.