SS-31 is a mitochondria-targeted tetrapeptide composed of the amino acids D-Arginine–2′,6′-dimethyltyrosine–Lysine–Phenylalanine. It has been investigated for its potential role in supporting mitochondrial function and protecting cells from oxidative stress.

Research has explored SS-31 in relation to:

* Mitochondrial function and energy production
* Oxidative stress and cellular protection
* Cardiovascular and metabolic health
* Neurological and neurodegenerative conditions