SS-31
A mitochondria-targeted peptide designed to work at the level of the inner mitochondrial membrane itself — stabilizing the structure that everything else in the cell's energy system depends on.
Where many longevity peptides focus on signaling or output, SS-31 focuses on the mitochondria's physical integrity — which is why it's often positioned as a foundation-first step in a broader mitochondrial support protocol.
This page covers what SS-31 is, how it works, and how it fits into a broader mitochondrial support sequence. Dosing guidance is not yet published for this product.
Dosing coming soon. SS-31 dosing will be published once a confirmed Bespoke Biology protocol sheet is available. Until then, this page is educational only — talk to your provider before starting any injectable protocol.
What SS-31 Is
SS-31 (also known as elamipretide) is a small, synthetic peptide developed specifically to target mitochondria — the structures inside nearly every cell responsible for producing energy. Unlike peptides that work through hormone or growth-factor signaling, SS-31 works directly at the level of the mitochondrial membrane.
It concentrates inside the inner mitochondrial membrane, where it binds to and stabilizes cardiolipin — a phospholipid that's essential to the membrane's structure and to how efficiently the mitochondria can produce usable cellular energy. Supporting cardiolipin helps protect the membrane from oxidative damage and supports more efficient energy output at the source.
Why SS-31 Before MOTS-c
SS-31 and MOTS-c both support mitochondrial health, but they work on different parts of the same system. SS-31 acts on the physical structure of the mitochondria — the membrane itself. MOTS-c acts more on metabolic signaling — how the cell uses energy and responds to metabolic stress once the mitochondria are functioning well.
The logic behind running SS-31 first is straightforward: a repair-and-signaling peptide like MOTS-c has more to work with when it's acting on a mitochondrial pool that's structurally sound. Addressing the membrane first, then layering in metabolic signaling support, is a sequencing approach some providers use rather than a formally established clinical protocol — it's a reasonable way to think about order of operations, not a guarantee of outcome.
How this typically plays out: A round of SS-31 is used first to support mitochondrial membrane integrity. MOTS-c and NAD+ are then introduced together to support metabolic signaling and cellular energy production on top of that foundation. Exact timing and whether to run rounds back-to-back or with a gap between them is a conversation for you and your provider — it depends on your individual goals and history.
What SS-31 Supports
SS-31 is studied primarily for its role in supporting mitochondrial structure and function — the foundation that cellular energy production depends on.
SS-31 concentrates in the inner mitochondrial membrane and binds to cardiolipin, a phospholipid essential to membrane structure. Supporting this membrane is foundational to how efficiently mitochondria can function.
By stabilizing the membrane, SS-31 helps protect mitochondria from the oxidative damage that accumulates with age, high physical demand, or metabolic stress.
Because it works on structure rather than downstream signaling, SS-31 is often positioned as a starting point before layering in peptides like MOTS-c that support metabolic output.
Because mitochondria are present in nearly every cell type, membrane-level support has relevance across energy, recovery, and general cellular health rather than any single organ system.
Common Questions
Interested in SS-31?
Dosing guidance for SS-31 is still being finalized. Reach out to be notified when it's available, or to ask your provider how it might fit into your protocol.
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