Cardiolipin
Cardiolipin overview — the molecular target that 1 compounds in the wiki act on.
In one line: The special "insulation" inside your cellular power plants — repairing it restores clean energy.
Cardiolipin is a unique fat that lines the inner wall of your mitochondria (the cell's power plants) and keeps their energy-making machinery wired correctly. With age and disease it gets damaged, so the plants leak and make energy less cleanly. The peptide elamipretide (SS-31) works by stabilising cardiolipin — think of it as repairing the insulation on the wiring so the power flows properly again. It's the furthest-along of the mitochondrial-repair drugs.