Figure 2.

Percentage of subjects perceiving an increase in mood after treatment for 12 weeks with a placebo, spray-dried extract of red maca, and spray-dried extract of black maca. Percentage of subjects with a score for mood of 4–5 (in agreement or completely in agreement that consumption of the product increased their mood) at (Upper) low and (Bottom) high altitude. LA: p = 0.01; 0.01; 0.029; 0.0026 using chi square test at weeks 3, 4, 8, and 12 comparing treatment with placebo, spray-dried extract of red maca, and spray-dried extract of black maca. Placebo: p > 0.05 over time (weeks 1 to 12); red maca p = 0.0001 over time; black maca p > 0.05 over time (weeks 1 to 12). HA: p = 0.019; 0.04; and 0.05 using chi square test at weeks 1,2, and 12 comparing treatment with placebo, spray-dried extract of red maca and spray-dried extract of black maca. Placebo: p = 0.0001; red maca: p = 0.003; black maca: p = 0.0002 over time.