Test water * Control water A B C D E Number of subjects with a successful outcome 9/16 9/19 9/14 11/20 6/15 5/18 Percentage of subjects with a successful outcome (%) 56% 47% 64% 55% 40% 28% Average of decreased value of Δ13C in subjects with a successful outcome 32 42 39 26 28 18 * RDSW with different Mg:Ca ratios of hardness 1000, as shown in Table 1.

Table 3: Percentage of subjects with a reduction of Δ13C ≥7% (defined as a successful outcome) in a clinical trial using 5 types of RDSW.