Its an ingredient whose safety hasnt been questioned so far by anyone (at least not that we know about)
Poolman B
Yang, C.-H., Chen, Y.-S., Lai, J.-S., Hong, W
Here's a general guideline for oral glutathione dosage based on body weight: 500 mg to 1,000 mg per day Suitable for people under 60 kg (132 lbs) 1,000 mg to 2,000 mg per day Recommended for those between 6080 kg (132176 lbs) 2,000 mg or more per day Suggested for people over 80 kg (176 lbs) For optimal results, many users pair glutathione with vitamin C (5001,000 mg daily), which helps boost its absorption and antioxidant effects
Secondary endpoints were: to describe the pharmacokinetic prole of SAG in plasma aer single dose administration of the test product, to assess the concentration levels of the GSH-related dipeptides Cys-Gly and Glu-Cys in plasma aer single dose administration of test and reference products and to collect safety and tolerability data of test and reference products aer single dose administration