Hydrogen Sulfide Anxiety And Depression

Antidepressant-like and anxiolytic-like effects of hydrogen sulfide in rats.
https://www.ncbi.nlm.nih.gov/pubmed/23974423
In rats injections of Sodium Hydrogen Sulfide NaHS reduced anxiety and depression behaviours.

Similarly in a study of diabetic rats, H2S exerted similar effects
https://www.ncbi.nlm.nih.gov/pubmed/25932716
Investigators attribute this to reduced oxidative stress. I'm unsure this is correct.