Where can researchers source third-party tested SS-31?

Midwest Peptide supplies research-grade SS-31 with a Certificate of Analysis included for every batch, validated by HPLC purity and mass spectrometry identity testing.

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Where to Buy SS-31 for Research | Midwest Peptide

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Where to Buy SS-31 for Research: Elamipretide Sourcing Guide

SS-31 · Published April 28, 2026 · Updated May 18, 2026 · 10 min read

Quick Answer

Researchers source SS-31 (elamipretide) from suppliers providing documented Certificate of Analysis, HPLC purity verification, and mass spectrometry identity confirmation for this Szeto-Schiller tetrapeptide. This guide covers research-grade quality criteria and how Midwest Peptide SS-31 meets specifications. For research use only, not for human consumption.

Where to Buy SS-31 for Research: Elamipretide Sourcing Guide

Research Use Only. All products are strictly for research use only (RUO). Not for human consumption. Products on this site are not intended to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the FDA. By purchasing, you agree that you are a qualified researcher and that products will be used solely for in-vitro research purposes.

Why Sourcing Matters for SS-31 Research
Certificate of Analysis Requirements
Manufacturing and Synthesis Provenance
Storage, Lyophilization, and Stability
Distinguishing Research-Grade From Commercial Material
Midwest Peptide SS-31 Sourcing
Cross-Cluster Sourcing for Combination Research
Cost, Volume, and Practical Procurement Considerations
Documentation Practices for Research Programs
Building a Sourcing Relationship for Long-Term Mitochondrial Research
Research Peptides Referenced
Related Research Reading
Frequently Asked Questions
Glossary

Where to buy SS-31 for research is one of the most common practical questions in the elamipretide research literature, since the choice of supplier directly affects the integrity of every downstream experiment. This sourcing guide reviews the documentation, quality, and provenance considerations that distinguish research-grade SS-31 10mg from commercial material that lacks complete characterization. For the broader SS-31 context see the SS-31 research cluster.

Frequently Asked Questions

What is SS-31 in research contexts?

SS-31 (elamipretide) is a synthetic four-amino-acid Szeto-Schiller tetrapeptide that selectively binds cardiolipin in the inner mitochondrial membrane. It is studied in preclinical research for cristae stabilization, mitochondrial bioenergetics, and ischemia-reperfusion injury.

What sourcing standards apply to SS-31 research peptides?

Verify HPLC purity above 98%, mass spec identity confirming the four-amino-acid sequence (D-Arg-2,6-dimethyl-Tyr-Lys-Phe-NH2) including the modified tyrosine residue, peptide content quantification, endotoxin testing, and a recent batch-specific COA.

Where can research labs source verified SS-31?

Midwest Peptide supplies research-grade SS-31 (elamipretide) with comprehensive COA documentation, HPLC purity verification, mass spec identity confirmation of the modified peptide, and lot tracking for reproducible mitochondrial peptide research.

Is SS-31 approved for human use?

No. SS-31 is not approved by the FDA for any human therapeutic use. It is supplied strictly for in-vitro and preclinical research purposes by qualified investigators.

Glossary

Key terms used in this article.

Cardiolipin: A unique phospholipid concentrated in the inner mitochondrial membrane that is essential for cristae structure and electron transport chain function.
Cristae: The folded inner membrane structures of mitochondria where the electron transport chain and ATP synthase reside.
Inner Mitochondrial Membrane (IMM): The highly folded mitochondrial membrane that hosts the electron transport chain and maintains the proton gradient for ATP synthesis.
Ischemia-Reperfusion Injury: Tissue damage caused when blood supply returns to tissue after a period of ischemia, driven largely by mitochondrial ROS.
Elamipretide: The international nonproprietary name for SS-31, a cardiolipin-targeted mitochondrial peptide in clinical research.
2,6-Dimethyl-Tyrosine: A modified tyrosine residue in SS-31 that contributes to cardiolipin binding affinity.
D-Arginine: The D-stereoisomer of arginine, a non-canonical amino acid in SS-31 that confers metabolic stability.

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For Research Use Only. SS-31 is intended exclusively for in vitro and preclinical research. It is not approved for human use, is not a drug, and should never be administered to humans or to animals outside of an authorized research protocol. Sourcing guidance in this article concerns research procurement only.

Why Sourcing Matters for SS-31 Research

The SS-31 research literature is built on the assumption that the reference compound being studied matches the labeled identity and meets a defined purity threshold. When that assumption is incorrect, mechanism work is uninterpretable, comparison work between studies becomes meaningless, and the cumulative literature accumulates noise rather than signal. The single most consequential decision a research program makes about SS-31 is which supplier to source from, because that decision determines whether the cumulative work contributes to the literature or undermines it.

Sourcing decisions therefore deserve the same rigor that researchers apply to experimental design. The criteria below describe the documentation and quality practices that distinguish research-grade material from commercial peptide products that lack complete characterization. Research programs that apply these criteria consistently produce more reliable data than programs that treat sourcing as an afterthought.

The SS-31 sequence (D-Arg-2',6'-dimethyltyrosine-Lys-Phe-NH₂) is also a particular synthesis challenge because it includes a non-standard D-amino acid at the first position, a modified tyrosine residue (2',6'-dimethyltyrosine, abbreviated Dmt), and a C-terminal amide. Each of these features requires correct synthesis chemistry to produce the active research compound. Material that does not correctly incorporate these features is not biologically equivalent to the published SS-31 reference compound.

Certificate of Analysis Requirements

A complete certificate of analysis is the single most important document a research-grade SS-31 supplier provides. The COA should be issued by an independent third-party laboratory rather than self-issued by the supplier, since self-issued documentation creates an obvious conflict of interest that the published literature has repeatedly flagged as a source of unreliable material. The third-party COA should document several specific measurements.

Identity by mass spectrometry. The measured molecular mass should match the theoretical mass for the SS-31 sequence including the D-arginine, dimethyltyrosine, and C-terminal amide modifications, to within standard mass spectrometry precision. Identity confirmation by MS rules out the most common forms of supplier substitution.

Purity by HPLC. The HPLC chromatogram should report area percent purity, typically expected above 98 percent for research-grade material. The chromatogram itself (not just the reported number) is the most informative element, since it documents what the impurity profile looks like. For SS-31, common synthesis-related impurities include incorrect stereochemistry at the D-arginine position, incomplete dimethylation of the tyrosine, and C-terminal acid (without amide). Each of these impurities can change the biological activity, and the HPLC chromatogram should resolve them.

Endotoxin and microbial screening. The COA should document endotoxin levels and bacterial contamination screening. Material that fails these screens should not be used in cell culture or in vivo research because the contaminants can produce signals that look like compound effects, particularly in mitochondrial research where mitochondrial dysfunction itself can be triggered by endotoxin exposure.

Lot identification and date. The COA should identify a specific manufacturing lot and the date of analysis, which are necessary for reproducibility across studies that use material from the same lot.

The Nature subject hub on analytical chemistry and the ScienceDirect topic page on peptide synthesis archive primary research on the analytical methods that underlie peptide identity and purity characterization.

Manufacturing and Synthesis Provenance

Research-grade SS-31 is produced by solid-phase peptide synthesis (SPPS), which is the standard method for synthetic peptides of this length. The supplier should be transparent about the synthesis location and the manufacturing facility, since the geographic and regulatory context of the synthesis affects the reliability of the documentation. Material synthesized in facilities that follow standard analytical practices and provide complete documentation is more reliable than material from facilities that operate without such practices.

The published literature flags certain failure modes that occur when synthesis provenance is opaque. These include sequence errors (one or more residues different from the labeled sequence), incomplete deprotection (residual protecting groups on amino acid side chains), aggregation impurities (peptide multimers that co-elute with the target), incorrect stereochemistry at the D-arginine position, and incomplete dimethylation of the tyrosine residue. Each of these failure modes can be detected by complete COA documentation but is invisible without it.

Storage, Lyophilization, and Stability

SS-31 is supplied as a lyophilized powder, which is the form that has the longest shelf life under standard storage conditions. Lyophilized peptide stored at low temperature in a sealed vial maintains identity and purity over extended periods, while reconstituted peptide is more sensitive to temperature, light, and time. The supplier should document the lyophilization method, the shipping temperature, and the recommended storage conditions. Material that arrives compromised because of inadequate shipping or that lacks shipping temperature documentation introduces uncertainty into downstream work.

This article does not address reconstitution, dilution, or administration of SS-31 because those activities fall outside the scope of research procurement and are not appropriate for general guidance. Research programs follow their own institutional protocols for handling research compounds, and the compound itself is for in vitro and preclinical research only.

Distinguishing Research-Grade From Commercial Material

The peptide market includes a wide range of suppliers with varying levels of documentation and quality. The published research literature has documented cases where commercial peptide products labeled with specific sequences contained different sequences when independently analyzed, contained substantially lower purity than labeled, or contained contaminants that produced confounding effects in research designs. These failures occur because some commercial suppliers operate without third-party analytical documentation and rely on customer trust rather than verified characterization.

Research-grade SS-31 is distinguished by several practical signals. The supplier provides a third-party COA on request rather than only on demand. The supplier identifies the manufacturing facility and synthesis method. The supplier documents lot identification and provides batch traceability. The supplier responds substantively to technical questions about identity, purity, and stability rather than referring all questions to generic customer service. Research programs that source consistently from suppliers meeting these criteria produce more reproducible work than programs that source by price alone.

The Wiley Online Library research peptide collection archives primary research on synthetic peptide quality and characterization relevant to sourcing decisions.

Midwest Peptide SS-31 Sourcing

Midwest Peptide supplies SS-31 10mg as a research-grade reference compound with third-party COA documentation, defined sequence including the D-arginine and dimethyltyrosine modifications, HPLC purity reporting, and endotoxin screening. The product is provided in lyophilized form and ships under controlled conditions. The compound is positioned for in vitro and preclinical research use only and should not be administered to humans or to animals outside of an authorized research protocol.

The sourcing of MOTS-C 10mg, NAD+ 500mg, and Glutathione 1500mg follows the same documentation standards. Research programs that source related research peptides from a single supplier with consistent documentation standards benefit from internal consistency in their reference compounds across studies.

Cross-Cluster Sourcing for Combination Research

Research programs that pair SS-31 with MOTS-C or other mitochondrial research compounds need consistent sourcing for both compounds, since variability in either compound undermines the comparison. The most reliable combination research uses both compounds from the same supplier with matching documentation standards. Programs that mix research-grade material from one supplier with poorly documented material from another supplier introduce sourcing variability into the comparison and produce less reliable combination data.

For combination research that uses both SS-31 10mg and MOTS-C 10mg as separate reference compounds, sourcing both from the same supplier with consistent documentation simplifies the analytical context. For an extended discussion of SS-31 plus MOTS-C combination research specifically, see our companion article on SS-31 vs MOTS-C mitochondrial peptide comparison research.

Cost, Volume, and Practical Procurement Considerations

Research-grade peptides are priced based on synthesis complexity, purity grade, and documentation overhead. SS-31 pricing reflects the synthesis cost of the modified residues (D-arginine, dimethyltyrosine), the C-terminal amide, plus the analytical work required for complete COA documentation. The synthesis is more demanding than for standard L-amino-acid peptides, which is reflected in the supplier pricing. Suppliers that offer dramatically lower pricing than the rest of the market are usually achieving that pricing by reducing analytical overhead or by using simpler synthesis chemistry that may not correctly produce the modified residues.

For research programs that need SS-31 across multiple studies, sourcing predictability matters as much as unit pricing. Suppliers that maintain consistent inventory, ship on predictable timelines, and provide consistent documentation across orders reduce the operational overhead of sourcing.

The Frontiers in Pharmacology archives primary research on peptide pharmacology relevant to sourcing decisions for research programs.

Documentation Practices for Research Programs

Research programs that document their own sourcing practices alongside their experimental data contribute to the cumulative literature in ways that pure outcome-focused studies cannot. Methods sections that identify the supplier, the lot number, and the COA reference for the reference compound used allow other research programs to assess comparability and to replicate work using the same material. The published literature has flagged the absence of sourcing documentation as a source of irreproducibility in research that depends on synthetic peptides, and journals increasingly require sourcing documentation as part of methods reporting.

Research-grade suppliers that provide complete documentation enable this kind of methods reporting. Suppliers that lack documentation force researchers to either omit sourcing information from methods sections (which undermines reproducibility) or to document sourcing without complete COA backing (which exposes the lack of characterization). Research programs benefit from sourcing relationships that support transparent methods reporting.

Building a Sourcing Relationship for Long-Term Mitochondrial Research

Research programs that anticipate sustained SS-31 work over multiple studies benefit from establishing a sourcing relationship with a single supplier rather than rotating across suppliers based on availability or pricing. The benefits of a sustained relationship include consistent documentation standards, predictable batch-to-batch quality profiles, and faster resolution of any technical questions that arise about specific lots. Suppliers that maintain consistent inventory and consistent COA practices over time are easier to integrate into long-term research planning than suppliers that vary in their documentation or supply consistency.

The sourcing relationship also matters for the broader inventory of related research compounds. Programs that source SS-31 10mg, MOTS-C 10mg, NAD+ 500mg, and Glutathione 1500mg from the same supplier benefit from cross-compound consistency in their reference compounds, which simplifies cross-cluster comparison work in mitochondrial biology research.

Research Peptides Referenced

SS-31 10mg, research grade Szeto-Schiller mitochondrially targeted tetrapeptide, third-party COA
MOTS-C 10mg, mitochondrially encoded peptide, often paired with SS-31
NAD+ 500mg, central coenzyme of mitochondrial metabolism
Glutathione 1500mg, master antioxidant for mitochondrial redox research

Within the SS-31 cluster:

Related clusters:

Not for human consumption. Research use only.

Age Verification

Where to Buy SS-31 for Research: Elamipretide Sourcing Guide

Frequently Asked Questions

What is SS-31 in research contexts?

What sourcing standards apply to SS-31 research peptides?

Where can research labs source verified SS-31?

Is SS-31 approved for human use?

Glossary

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Why Sourcing Matters for SS-31 Research

Certificate of Analysis Requirements

Manufacturing and Synthesis Provenance

Storage, Lyophilization, and Stability

Distinguishing Research-Grade From Commercial Material

Midwest Peptide SS-31 Sourcing

Cross-Cluster Sourcing for Combination Research

Cost, Volume, and Practical Procurement Considerations

Documentation Practices for Research Programs

Building a Sourcing Relationship for Long-Term Mitochondrial Research

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Ready to Start Your Research?

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Age Verification

Where to Buy SS-31 for Research: Elamipretide Sourcing Guide

Frequently Asked Questions

What is SS-31 in research contexts?

What sourcing standards apply to SS-31 research peptides?

Where can research labs source verified SS-31?

Is SS-31 approved for human use?

Glossary

More from the Blog

Subcutaneous vs Intranasal: Choosing an Administration Route for DSIP, Selank, and Kisspeptin in Research

Can I Still Buy Compounded Tirzepatide? (2026 Research Context)

Why Sourcing Matters for SS-31 Research

Certificate of Analysis Requirements

Manufacturing and Synthesis Provenance

Storage, Lyophilization, and Stability

Distinguishing Research-Grade From Commercial Material

Midwest Peptide SS-31 Sourcing

Cross-Cluster Sourcing for Combination Research

Cost, Volume, and Practical Procurement Considerations

Documentation Practices for Research Programs

Building a Sourcing Relationship for Long-Term Mitochondrial Research

Research Peptides Referenced

Related Research Reading

Ready to Start Your Research?

Where can researchers source third-party tested SS-31?

What's the Cheapest Way to Get Tirzepatide (GLP-2 TZ) for Research?