What Is SS-31? A Research Guide

What is SS-31?

SS-31 is supplied strictly for laboratory and research use only. It is not intended for use in humans or animals, and nothing in this guide describes any such use. The purpose here is to characterise what the molecule is at a research level and to summarise why it draws scientific interest in preclinical and laboratory settings.

SS-31, also referred to in the scientific literature as elamipretide or MTP-131, is a small synthetic tetrapeptide. It belongs to a family of aromatic-cationic, mitochondria-associated peptides that carry a distinctive alternating pattern of basic and aromatic residues. This structural signature is what researchers use to characterise the class and distinguish it from unrelated short peptides.

At a high level, its published sequence is described as D-Arg-dimethylTyr-Lys-Phe-NH2, a four-residue chain that includes a non-standard, modified tyrosine residue. This combination of positively charged and aromatic side chains is a defining feature of the aromatic-cationic peptide class to which SS-31 is assigned.

You can view current laboratory stock on the product page.

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Why researchers study SS-31

Interest in SS-31 in the scientific literature is overwhelmingly preclinical and mechanistic. It is most often described in the context of mitochondrial biology, which is why it sits within the longevity research category rather than any single organ system.

SS-31 is investigated in preclinical and laboratory research for its role in mitochondrial membrane pathways, in particular its studied association with the inner mitochondrial membrane and a phospholipid found there called cardiolipin. Because cardiolipin is closely linked to the organisation of the electron transport chain, this association has made SS-31 a frequently used tool compound in laboratory models exploring mitochondrial structure and bioenergetics.

In these settings the peptide is studied as a probe for questions about how mitochondrial membrane composition relates to energy production and oxidative processes at a molecular level. All of this represents research interest in pathways and models. It does not describe any demonstrated effect in a person or animal.

Cardiolipin and mitochondrial membrane pathways

Much of the mechanistic literature focuses on the studied interaction between SS-31 and cardiolipin within the inner mitochondrial membrane. Cardiolipin helps to stabilise the protein complexes that carry out oxidative phosphorylation, so it is a natural focal point for researchers characterising how membrane organisation relates to energy metabolism.

In cell-based and isolated-mitochondria models, SS-31 has been examined as a tool for probing how membrane-associated peptides may relate to electron transport chain organisation and the handling of reactive oxygen species. These are questions about molecular mechanism studied under controlled laboratory conditions.

• Class: aromatic-cationic tetrapeptide (mitochondria-associated)
• Reported sequence at a high level: D-Arg-dimethylTyr-Lys-Phe-NH2
• Also known in the literature as elamipretide and MTP-131
• Research focus: cardiolipin and inner mitochondrial membrane biology
• Category context: longevity and mitochondrial ageing models

SS-31 in longevity and ageing research models

Because mitochondrial function is a recurring theme in the biology of ageing, SS-31 appears in preclinical work that models age-related changes in tissue energetics. In these studies it is used as an investigational compound to interrogate hypotheses about how mitochondrial membrane composition and integrity may shift in laboratory ageing models.

This body of work is exploratory and mechanistic. It examines cellular and molecular endpoints under experimental conditions, and it does not establish any outcome, benefit, or effect in living humans or animals. Researchers select SS-31 in these contexts precisely because it gives them a defined, well-characterised molecule to test mitochondrial hypotheses against.

How to verify quality

For any research peptide, confidence begins with documentation. Every batch supplied by Pepology is third-party lab tested by Novagen Laboratories, and each batch is accompanied by a certificate of analysis that customers can independently verify. The certificate is where identity and purity are documented rather than assumed.

A certificate of analysis for a peptide such as SS-31 typically reports the types of testing used to characterise the material, including identity confirmation and purity assessment by high performance liquid chromatography, or HPLC. Rather than trusting any figure in isolation, a researcher should read the certificate as a whole and confirm it corresponds to the exact material in hand.

The single most important check is that the lot number printed on the vial matches the lot number on the certificate. A certificate only describes the specific batch it was issued for, so a mismatch means the document does not apply to that vial.

You can confirm a certificate against its batch using the verification tool.

• Confirm the lot number on the vial matches the lot number on the certificate
• Check that the certificate names the compound as SS-31
• Look for identity confirmation and HPLC purity assessment on the document
• Use independent verification rather than relying on a printed claim alone
• Retain the certificate alongside the material for your records

Verify a batch certificate

Sourcing SS-31 in Australia with confidence

Pepology is an Australian, Gold Coast owned and operated retailer of research peptides. Sourcing domestically means dealing with a local supplier that stands behind its documentation, with every batch third-party tested by Novagen Laboratories and a verifiable certificate of analysis available for each one.

When sourcing SS-31 for a laboratory, the priorities are traceability and transparency: a clearly identified compound, a matching certificate, and a straightforward way to verify that certificate independently. Those are the checks that separate a documented research material from an unverified one.

SS-31 is supplied for laboratory and research use only. It is not intended for use in humans or animals. Researchers can view current stock, confirm documentation, and browse the wider catalogue below.

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