Thank you for this interesting question. It is not possible to provide an accurate answer without knowing the full details of your medical history, including the other medications you take. As a result, I strongly recommend you schedule an appointment with a primary care doctor
to discuss this further. At this visit, you can discuss your reasons for taking glutathione and whether a different medication or lifestyle change is more appropriate.
Glutathione is an antioxidant typically synthesized by the liver. Antioxidants help repair damage done by free radicals, thereby preventing cell death. Of late, many people have been interested in increasing their levels of antioxidants in the hope that this will further increase repair of damaged cells. Unfortunately, there are no high quality data to support this. In fact, some recent data have shown that high levels of antioxidant intake are harmful. Supplements are not regulated by the FDA the same way as medications. As such, many supplements do not actually contain the supplements they claim. This can be particularly dangerous with respect to medication interactions. Isoniazid classically has interactions with multiple other agents. As such, I do not recommend taking a glutathione supplement until you discuss this further with a primary care doctor.