l-glutathione oxidized sigma Sigma-Aldrich ʟ-Glutathione oxidized, CAS 27025-41-8, ≥98%, lyophilized powder 1 g GSSG is composed of two reduced GSH molecules linked by a disulfide bond Glutathione | 70-18-8
Description
It works by suppressing the tyrosinase enzyme and shifting melanin synthesis from darker eumelanin to lighter pheomelanin

However, repeated temperature excursions are the real problem

An antioxidant like glutathione helps to maintain good health by neutralizing free radicals, which are can cause cell damage by oxidation

Your provider will guide this based on your results
