Mean BP against time for garlic-only intervention arm(s) of studies using subjects with SBP≥130 mm Hg at start of intervention (A), SBP < 130 mm Hg (B), DBP≥85 mm Hg (C), DBP < 85 mm Hg (D). The plot incorporates garlic-only intervention arms of studies included in the systematic review: study arms in meta-analysis are in red/orange and marked with *, others are in black/grey. Diamonds illustrate trials using garlic powder and circles illustrate other garlic preparations. Studies in legend boxes are sorted by baseline blood pressure. Abbreviations: K88_2 = Kandziora 1988 (Study 2) , garlic vs drug; K88_1*= Kandziora 1988 (Study 1) , garlic+drug vs placebo+drug; A90* = Auer et al. 1990 ; DJ95 = De A Santos & Johns 1995 ; D04hyp = Durak et al. 2004 , hypertensive study arm; DJ04hyp = Dhawan & Jain 2004 , hypertensive study arm; VS90* = Vorberg & Schneider 1990 ; H92*= Holzgartner et al. 1992 ; DG93 = De A Santos & Grünwald 1993 ; J05swall = Jabbari et al. 2005 , swallowing garlic study arm; J05chew = Jabbari et al. 2005 , chewing garlic study arm; H88 = Harenberg et al. 1988 ; S96para = Steiner et al. 1996 , parallel study arm ; DJ04norm = Dhawan & Jain 2004 , normotensive study arm; S96cross = Steiner et al. 1996 , crossover study arm; J93 = Jain et al. 1993 ; S95 = Simons et al.1995 ; S94 = Saradeth et al. 1994 ; D04norm = Durak et al. 2004 , normotensive study arm ; Z00 = Zhang et al. 2000 ; Ki91 = Kiesewetter 1991 ; T04 = Turner et al. 2004 , median BP.