There is no published human trial of the three compounds together
Abbreviations GAC: Green analytical chemistry GSH: Glutathione NAC: N-acetyl l-cysteine Vit-C: Vitamin C HPLC: High-performance liquid chromatography UV: Ultraviolet HPTLC: High-performance thin-layer chromatography KOH: Potassium hydroxide LOD: Limit of detection LOQ: Limit of quantification SD: Standard deviation RSD: Relative standard deviation FTIR: Fourier transmission infrared spectroscopy IR: Infrared ICH: International conference on harmonization HCl: Hydrochloric acid NaOH: Sodium hydroxide H 2 O 2 : Hydrogen peroxide References Duperray J, Sergheraert R, Chalothorn K, Tachalerdmanee P, Perin F (2022) The effects of the oral supplementation of l-cystine associated with reduced l-glutathione-GSH on human skin pigmentation: a randomized, double-blinded, benchmark-and placebo-controlled clinical trial

Trimetazidine (10 mg/kg/day for 2 weeks) reduced peripheral blood oxidative stress caused by amikacin, a widely prescribed antibiotic that can produce ototoxic effects that can cause damage to the cochlea [174]
This helps protect the glutathione until it hits your stomach for better absorption
[PubMed] [Google Scholar] 243.Franco P.G., Silvestroff L., Soto E.F., Pasquini J.M
Recent advances of hydrogel-based biomaterials for intervertebral disc tissue treatment: a literature review