Alot of people use a supplement called NAC for OCD but I think the potential side effects are too powerful. You might try nebulized glutathione or another bioavailable form. Its a major liver antioxidant so its just massively enhancing your body's ability to clean up.
i copy/pasted the following with some edits:
"Key Micronutrients mentioned in here:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7066598/
As far as lifestyle interventions/non-invasive therapies go, mindfulness meditation, electroacupuncture and kundalini yoga had some positive effects on OCD:
https://www.sciencedirect.com/science/article/abs/pii/S0165032711002187?via=ihub
So for micronutrient supplements: D3 (sunbathing is optimal by far)+K2, (methyl)B12, 5-MTHF (watch for worse mood on folates), Selenium (careful not to overdo intake incl diet), Zinc+Copper (try and get from food, 25mg max supplemented imho), Magnesium(bis)glycinate (get the powder).
Others: NAC, Myo-Inositol (18gr+) (get powder it tastes like sugar), Sarcosine, Neboglamine
NAC can be used safely along SSRI/SNRI treatment, but Myo-Inositol and Sarcosine can enhance its effect"
If you start testing supplements, keep a diary of how you feel and take breaks from them to id side effects.