Glutathione supplementation is generally considered safe. However, the crucial point here is the dosage and duration of supplementation. Due to some uncertainties in the subject, my recommendation is to avoid long-term supplementation with high doses of glutathione.
Of course, regardless of the dosage and duration, I would like to emphasize again the importance of consulting a healthcare professional. Due to the lack of data during pregnancy and breastfeeding, we do not recommend the use of glutathione.