From what I researched, the key difference comes down to absorption
doi: 10.3390/ijms22073789 75 DabravolskiSANikiforovNGEidAHNedosugovaLVStarodubovaAVPopkovaTVet al
Plant Cell 10:753764 Noctor G, Mhamdi A, Foyer CH (2016) Oxidative stress and antioxidative systems: recipes for successful data collection and interpretation
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Several studies in noise-exposed rats, chinchillas, and rabbits, have reported that the administration of NAC minimizes the progression of apoptosis in sensory hair cells and reduces significantly the auditory threshold shifts, at low and medium frequencies, as compared to untreated animals (Kopke et al., 2000
Together, these peptides became of interest for laboratory research into growth hormone regulation, recovery, and metabolic processes