Cysteine, glutamic acid, and glycine are the three amino acids that are combined naturally to form them in your liver
A standard approach for research use is dissolution in sterile water at 1 to 10 mg/mL
Nat Commun 5:5338 Cai Q, Chen M, Wang B, Wang J, Xia L, Li J (2024) Inhibition of lung adenocarcinoma cell growth by phytosphingosine inducing G2/M-phase arrest, apoptosis, and mitochondria-dependent pathway cell death in vitro and in vivo
Raschi E, Fusaroli M, Giunchi V, Repaci A, Pelusi C, Mollica V, et al
Hydrogen peroxide is the major ROS producer in human spermatozoa
Using these without proper medical advice isnt unsafe