Most peptides break down in the digestive tract, but certain compounds like MK-677 (a growth hormone secretagogue) and oral BPC-157 formulations are absorbed effectively and have clinical evidence supporting their effects on muscle growth, recovery, and hormone signaling
In addition, when circulating L-carnitine concentration increases, as in the case of oral supplementation, renal reabsorption of L-carnitine may become saturated, resulting in increased urinary excretion of L-carnitine (5)
Shaking the vial creates shearing forces that can physically break the delicate amino acid bonds of the peptide, a process called denaturation
ROS are also created as a result of phagocytosis by the RPE of the photoreceptors light absorbing photo-pigments contained in the outer segments (OS) 24
Be aware that NAC powder is inherently tart, making pills generally preferable