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Research Comparison

NAD+ vs SS-31

NAD+ and SS-31 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:Cellular LongevityMetabolic
ClassDinucleotide coenzyme — not a peptideMitochondria-targeting aromatic-cationic tetrapeptide (cardiolipin-binding)
Molecular weight663.43 g/mol639.81 g/mol
CAS numberNot assigned / not specifiedNot assigned / not specified
Purity spec≥99%≥99%
Research areasCellular Longevity, MetabolicCellular Longevity, Metabolic
Primary diluentSterile or bacteriostatic waterBacteriostatic water (0.9% benzyl alcohol)
Working windowShort: commonly worked with within 1–2 weeks at 2–8 °C, and prepared fresh where accuracy matters.Commonly worked with for 3-4 weeks at 2-8 °C.
Lead degradation routeAlkaline hydrolysis — NAD+ degrades rapidly above neutral pH. This is the single most important handling fact about the compound.Adsorptive loss to plasticware from the cationic charge — the main practical concern.
Freeze–thawAliquot immediately after reconstitution. NAD+ solutions tolerate freezing but each thaw restarts the hydrolytic clock.Tolerant; the unnatural residues resist degradation. Aliquot as standard practice.
Light sensitivityProtect from light; the nicotinamide ring is photo-sensitive.No specific light requirement beyond normal practice.

How they actually differ

Comparing the two: NAD+ is dinucleotide coenzyme — not a peptide, while SS-31 is mitochondria-targeting aromatic-cationic tetrapeptide (cardiolipin-binding) — different molecular classes with different handling consequences; they call for different primary diluents (sterile or bacteriostatic water versus bacteriostatic water (0.9% benzyl alcohol)); their leading degradation routes differ (alkaline hydrolysis for NAD+, adsorptive loss to plasticware from the cationic charge for SS-31), 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.

NAD+ — origin

NAD+ is not a peptide at all, and that single fact governs everything about how it is handled. It is a dinucleotide coenzyme — nicotinamide and adenine linked through a pyrophosphate bridge — present in every living cell and central to redox metabolism. It was first identified in 1906 by Arthur Harden as a small heat-stable factor required for yeast fermentation.

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.

NAD+ research themes

Sirtuin activation

Sirtuins consume NAD+ as a co-substrate, which links cellular NAD+ availability directly to their activity.

Mitochondrial energy metabolism

Its canonical role as the central redox carrier of cellular respiration.

DNA repair via PARP

PARP enzymes consume NAD+ during DNA damage response, a heavily studied competing demand.

Age-related NAD+ decline

A major driver of current research interest: measured NAD+ levels fall with age across tissues in animal models.

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.

NAD+ handling

  • Allow the sealed vial to reach room temperature before opening — opening a cold vial of hygroscopic material condenses water directly onto it.
  • Keep solutions at or below neutral pH; alkaline conditions destroy NAD+ quickly.
  • Prepare fresh solutions where concentration accuracy is important rather than relying on stored stock.
  • Protect from light at all stages.

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.

Both third-party tested

Every Popular Peptides batch of NAD+ and SS-31 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

NAD+ reference

Full NAD+ reference NAD+ storage NAD+ reconstitution NAD+ calculatorNAD+ product details

SS-31 reference

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

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NAD+ and SS-31 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.