What Is SS-31 Peptide? SS-31, a peptide that targets mitochondria, has received recognition for its potential therapeutic applications in various medical conditions. SS-31 is composed of four amino acids: D-arginine, D-arginine, D-tyrosine, and L-2,6-dimethyltyrosine, which makes it resistant to enzymatic degradation. The unique structure of SS-31 allows it to effectively penetrate cell membranes and accumulate within the mitochondria. Once nestled …