Hydrogen water and hydrogen inhalation are generally safe when used as directed, but it's important to consult a healthcare professional before starting any new therapy, especially if you have existing health issues.
There are some potential side effects to keep in mind.
With hydrogen water, some users might experience mild gastrointestinal discomfort, like bloating, gas, or diarrhea, and it can have a slightly metallic taste.
Inhaling hydrogen gas may lead to dryness in the mouth or throat, and some people might also feel headaches or dizziness, particularly if they inhale too much hydrogen gas too quickly.