Available human studies are characterized by relatively small sample sizes, heterogeneity in dosing regimens, and short intervention durations, which restrict the ability to draw firm conclusions regarding efficacy and optimal therapeutic windows
Weeks 812+: The Collagen Remodeling Window Significant reductions in deeper wrinkles, increased collagen density, and clearer, more resilient skin are commonly observed
Quality concerns : Selfsourcing peptides from online vendors poses significant riskscontamination, inaccurate dosing, substitution, and lack of medical screening for contraindications
During the experiments, the GSH produced by ZJ123, ZJ1234, and ZJ12345 did not decrease significantly, indicating that the lack of ggt and pepT prevented GSH degradation and further increased the yield