目前仅见一些动物实验，对人类患者的效果不能确定。且动物实验结果也存在很大差异，有的结果显示氢气能降低高血压，但也有没有发现降压效果，只对高血压导致的器官损伤具有保护作用。

曾经遇到不少朋友，过去高血压比较严重，但经过长期大量用氢，结果血压更平稳，甚至有的不用药也能维持正常水平。对这种案例，由于没有进行严格对照研究，无法作为有效证据。且也不容易理解为什么大量用氢能降低高血压，这需要进行严格大规模临床试验来确定效果，需要更深入研究对机制进行分析。

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