“…Zingiber officinale was examined in the primary studies of 11 (46%) systematic reviews ( 30 , 32 , 34 , 37–39 , 41 , 44 , 45 , 47 , 48 ) and the remaining 13 (54%) reviews did not specify the species of ginger administered. Most systematic reviews explored multiple forms of ginger consumption, but ginger capsules were the most commonly administered [ n = 14 (58%) systematic reviews] ( 2 , 29 , 32 , 33 , 36 , 39–42 , 45 , 46 , 48–50 ) followed by ginger powder [ n = 6 (25%) of systematic reviews; Table 2 ] ( 30 , 31 , 34 , 35 , 37 , 38 ). Dosage of ginger varied greatly between primary studies, with 0.5–2 g/d being most commonly administered ( 2 , 29–35 , 37–42 , 44–47 , 49 , 50 ).…”