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Research Comparison

SS-31 vs Tesamorelin

SS-31 and Tesamorelin are studied in overlapping research areas, which is why they are frequently compared. This is a neutral side-by-side reference drawn from published preclinical literature and laboratory handling data.

Shared research areas:Metabolic
ClassMitochondria-targeting aromatic-cationic tetrapeptide (cardiolipin-binding)Full-length 44-residue GHRH analogue with trans-3-hexenoic acid modification
Molecular weight639.81 g/mol5135.0 g/mol
CAS numberNot assigned / not specifiedNot assigned / not specified
Purity spec≥99%≥99%
Research areasCellular Longevity, MetabolicHormonal & Endocrine, Metabolic
Primary diluentBacteriostatic water (0.9% benzyl alcohol)Bacteriostatic water (0.9% benzyl alcohol)
Working windowCommonly worked with for 3-4 weeks at 2-8 °C.Commonly worked with for 2–3 weeks at 2–8 °C.
Lead degradation routeAdsorptive loss to plasticware from the cationic charge — the main practical concern.Aggregation at air–liquid interfaces from agitation — the practical failure mode for longer chains.
Freeze–thawTolerant; the unnatural residues resist degradation. Aliquot as standard practice.Do not freeze reconstituted material. At this chain length, interfacial aggregation during freezing is a real risk.
Light sensitivityNo specific light requirement beyond normal practice.No specific light requirement beyond normal practice.

How they actually differ

Comparing the two: SS-31 is mitochondria-targeting aromatic-cationic tetrapeptide (cardiolipin-binding), while Tesamorelin is full-length 44-residue ghrh analogue with trans-3-hexenoic acid modification — different molecular classes with different handling consequences; their leading degradation routes differ (adsorptive loss to plasticware from the cationic charge for SS-31, aggregation at air–liquid interfaces from agitation for Tesamorelin), so the storage precautions that matter are not the same; their practical working windows differ once reconstituted. The sections below set out each in full.

SS-31 — origin

SS-31 (Elamipretide) is a Szeto-Schiller aromatic-cationic tetrapeptide (D-Arg-2',6'-dimethyltyrosine-Lys-Phe-NH2) that concentrates in the inner mitochondrial membrane and binds cardiolipin, the lipid unique to that membrane. Its structure is the reason it is studied specifically at the mitochondrion rather than as a general antioxidant.

Tesamorelin — origin

Tesamorelin is the complete 44-amino-acid sequence of human growth hormone-releasing hormone with a trans-3-hexenoic acid group attached at the N-terminus. That modification exists for one reason: native GHRH is cleaved almost immediately by dipeptidyl peptidase-4 at the N-terminal end, and the hexenoyl group blocks that cleavage.

SS-31 research themes

Cardiolipin binding

Studied for selective association with cardiolipin in the inner mitochondrial membrane, the basis of its mitochondrial targeting.

Electron transport efficiency

Examined for effects on mitochondrial energy production in research models of mitochondrial dysfunction.

Oxidative stress

Investigated around reactive-oxygen-species handling at the mitochondrion.

Tesamorelin research themes

GHRH receptor agonism

Full-length GHRH activity with DPP-4 resistance conferred by the N-terminal modification.

Visceral adipose tissue

The most distinctive endpoint in its research literature.

GH pulsatility

Studied for effects on endogenous GH secretion patterns rather than direct GH substitution.

Metabolic parameters

Investigated alongside body-composition endpoints in metabolic research.

SS-31 handling

  • Reach room temperature before opening.
  • Use low-bind labware and buffers at low working concentrations to limit adsorption of the cationic peptide.
  • Aliquot and refrigerate.

Tesamorelin handling

  • Allow several minutes for dissolution; do not accelerate with agitation or heat.
  • Swirl gently — long chains aggregate at interfaces.
  • Do not freeze reconstituted solution.

Both third-party tested

Every Popular Peptides batch of SS-31 and Tesamorelin is independently tested by HPLC and LC-MS with a published Certificate of Analysis. Enter a lot number to pull the COA for a specific vial.

Verify a batchPublished COAsHow we test

SS-31 reference

Full SS-31 reference SS-31 storage SS-31 reconstitution SS-31 calculatorSS-31 product details

Tesamorelin reference

Full Tesamorelin reference Tesamorelin storage Tesamorelin reconstitution Tesamorelin calculatorTesamorelin product details

Related comparisons

5-Amino-1MQ vs SS-315-Amino-1MQ vs TesamorelinCJC-1295 (No DAC) vs SS-31CJC-1295 (No DAC) vs TesamorelinCJC-1295 + Ipamorelin vs SS-31CJC-1295 + Ipamorelin vs TesamorelinDSIP vs SS-31Epitalon vs SS-31

SS-31 and Tesamorelin are supplied strictly as research chemicals for in-vitro laboratory and research use only. They are not intended for human or animal consumption, diagnostic, or therapeutic use. This comparison summarizes published preclinical literature and laboratory handling data; it is not medical advice, not a claim of efficacy, and not usage guidance.