Hydrogen Water and Mood, Anxiety and Autonomic Balance — What a 4-Week Trial Showed

A 2017 double-blind, placebo-controlled crossover trial in Medical Gas Research tested 4 weeks of hydrogen-rich water (600 mL/day) in 26 healthy adults. Compared with placebo, participants showed significant reductions in psychological distress (K6 score) and lower resting sympathetic nerve activity — pointing to small but measurable everyday-wellbeing effects.