third party tested liposomal glutathione Liposomal Glutathione

The palmitoleic acid content is especially notable as it's somewhat rare in plant oils

Neuron 60 , 610624 (2008)

The research, published in the Journal of Endocrinology and Metabolism, found that the peptide had no effect on serum IGF-1 levels, no negative effect on carbohydrate metabolism, and no anti-AOD-9604 antibodies were detected in any patients

That molecule was GHK

similarly showed statistically significant improvement in knee symptoms and daily activity using the Tegner Lysholm Knee Scoring Scale (TLKSS) score in 126 patients with degenerative meniscus lesions and cartilage injuries after 3 months and 6 months of follow up (i.e., TLKSS: 61.9 7.4 baseline, 83.5 4.6 post- 3 months, 83.4 4.3 post- 6 months, p = 0.00065)

This is especially interesting when we consider motor learning and rehabilitation