Objective.—To assess the effects of supplementation with oral potassium on blood pressure
in humans. Design.—Meta-analysis of randomized controlled trials. Data Sources.—English-
language articles published before July 1995. Study Selection.—Thirty-three randomized
controlled trials (2609 participants) in which potassium supplementation was the only
difference between the intervention and control conditions. Data Extraction.—Using a
standardized protocol, 2 of us independently abstracted information on sample size …