± 5 vs. 25.4 ± 4.7 for the placebo group, p = 0.03031), this decrease was greater in the sarcosine group (18.6 ± 6.1 vs. 25.4 ± 4.7; p = 0.00001). The difference in metabolite ratios and negative PANSS subscale scores were calculated between the start-point and end-point of the experiment. Correlations between these differences are presented in Table 2 and in Figure 1.