				Intervention					Population
Study #	Reference	Jadad score	Design	Ingredient type	Food product^b	Duration (weeks)	VPP/IPP dose (mg/d)^c	VPP/IPP dose in VPP eq. (mg/d)^d	Type of subjects (BP status)	n	Mean age (y)
1	Aihara 2005 [30]	4	D	Fermented	Supplement	4	13	16	PHT	40	51.4
2	Ishida 2006 [34]	4	D	Enzymatic	Supplement	4	16	23	PHT	18	51.2
									NT	18	48.9
3	Ishida 2007 [35]	4	D	Enzymatic	Supplement	12	4	5	PHT	71	50.3
4	Ishida 2011 [31]	4	D	Enzymatic	Supplement	4	17	24	NT	16	44.2
									PHT	16	49.6
5	Itakura 2001 [36]	3	D	Fermented	Drink	8	3	3	NT	26	36.0
6	Mizuno 2005 [32]	3	S	Enzymatic	Supplement	6	4	5	PHT	24	42.8
							3	3	PHT	24	46.4
							2	2	PHT	24	45.0
7	Nakamura 2004 [38]	4	D	Fermented	Drink	12	4	5	PHT	106	38.5
8	Sano 2005 [33]	4	D	Enzymatic	Drink	12	3	4	PHT	104	49.0
9	Sano 2004 [39]	4	D	Enzymatic	Drink	4	9	13	NT	11	44.6
									PHT	16	45.5
10	Kajimoto 2001 [37]	4	D	Fermented	Supplement	2	12	16	NT	43	29.7
11	Uchida 2016 [40]	5	D	Enzymatic	Supplement	12	3	5	PHT	24	56.3
									NT	24	56.3