Wilson D, Goggin K, Williams K, Gerkovich MM, Gqaleni N, Syce J, Bartman P, Johnson Q, Folk WR. Consumption of Sutherlandia frutescens by HIV-Seropositive South African Adults: An Adaptive Double-Blind Randomized Placebo Controlled Trial. PLoS One. 2015; 10(7):e0128522.