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Study # | Reference | Jadad score | Design | Ingredient type | Food productb | 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 |
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| 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 |
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| 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 |
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| 3 | 3 | PHT | 24 | 46.4 |
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| 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 |
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| 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 |
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| NT | 24 | 56.3 |