Krzeski 1993.

Methods	Double blinded: yes.
Participants	N=134 Polish men with symptomatic BPH (> 1 symptom). Age range: 53‐84, mean 64 years. Lost to follow‐up: 14.2%.
Interventions	Treatment 1: P. africanum 25 mg + Urtica dioica 300 mg (n=67). Treatment 2: half dose of above (n=67). Treatment duration: 8 weeks.
Outcomes	Overall improvement in symptoms; nocturia; peak flow rate; residual volume. Adverse events.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear