You can use morning, evening, or both without significant irritation risk
The light modifier subunit GCLM is enzymatically inactive but plays an important regulatory function by lowering the Km of GCLC for glutamate and raising the Ki for GSH [7, 8]
(4) Vladimir Khavinson, Francesca Diomede,Ekaterina Mironova, Natalia Linkova, et al (2020) AEDG Peptide (Epitalon) Stimulates Gene Expression and Protein Synthesis during Neurogenesis: Possible Epigenetic Mechanism Molecules, 2020 Jan 30, Volume 25 (Issue 3), Page 609
Tumours and tissues were snap-frozen on dry ice and stored at 80 C or placed in 10% neutral buffered formalin (Fisher Scientific, 22-110-761) for 24 h and then stored in 100% methanol (Fisher Scientific, A412P-4)