A total of @ men and non-pregnant women aged @-@ year , with new diagnosis of prediabetes ( glucose @ < @ mmol/L and/or post-load glucose @ < @ mmol/L ) and hypomagnesemia ( serum magnesium levels < @ mmol/L ) were enrolled in a clinical double-blind placebo-controlled trial and randomly allocated to receive either magnesium chloride ( @ mL of MgCl@ @ % solution ) or NaHCO@ @ % solution , once daily for @ months .