NAC for treatment resistant OCD with Magtein

Hi there, I have pure which has proven to be treatment resistant. I am struggling with ERP as its more the intrusive thoughts that get me anxious and keep shocking me.

I have started taking Magtein and immediately I have noticed some modest improvement. I want to start taking NAC, but the bottle i have says take it at 600mg once a day; not to exceed the dosage. However, the trials I read all point to much higher dosages. I was wondering if I can ignore the stated limit, or if people can get some benefit from this dosage?

Thanks!