If your peptide has been stored improperly, at room temperature, exposed to light, or reconstituted for months, discard it
[PubMed abstract] Desouza C, Keebler M, McNamara DB, Fonseca V
Under physiological conditions, GSH synthesis relies on two key enzyme (glutamate cysteine ligase (GCL) and glutathione synthetase (GSS)) and the availability of cysteine (Lu, 2009, 2013)
Ingredients like shea butter, glycerin, and oatmeal are your friends herethey help maintain your skin's moisture barrier whilst the glutathione does its brightening work
Research shows that L-carnitine increases the concentration of the neurotransmitter and optimizes its function at mitochondrial level