What does 'targeted-to versus derived-from' mean here?

It is the cleanest way to keep the two apart. SS-31 is a designed compound built to reach and associate with the inner mitochondrial membrane — it is targeted TO the mitochondria. MOTS-c is a peptide whose sequence is encoded within mitochondrial DNA itself — it is derived FROM the mitochondria. They sit on opposite sides of that relationship, which is why they are prepared and verified differently despite sharing the 'mitochondrial peptide' label.

Should an SS-31 COA and a MOTS-c COA look the same?

No, and that is the practical takeaway. An SS-31 release sheet has to prove its two unnatural residues — the D-arginine (a chirality check ordinary purity runs miss) and the 2',6'-dimethyltyrosine (roughly 28 Da that a plain-tyrosine impostor would lack) — by accurate-mass MS with the HPLC chromatogram. A MOTS-c certificate confirms the correct 16-residue sequence by mass spectrometry with HPLC purity and watches for truncated sequences. A single generic 'tested' badge covering both is a red flag.

Does Titan sell SS-31 or MOTS-c?

Neither is a core Titan catalog product. Titan's RUO line centers on in-house-tested research peptides such as BPC-157, TB-500, retatrutide, the CJC-1295 + Ipamorelin blend, and pre-mixed nasal-format peptides. Rather than list compounds it does not verify in-house, Titan points researchers to what it does stock and to the COA standard that applies to any research compound. The where-to-buy pages cover the honest sourcing context.

Are SS-31 or MOTS-c for human use?

No. Anything discussed here is strictly for in-vitro laboratory research. Neither SS-31 nor MOTS-c is for human or animal consumption, diagnostic, therapeutic, or preventative use, and no cardiac, metabolic, longevity, or energy outcome is claimed for either. Nothing on this page is a dosing schedule or a human-use protocol — it is a chemistry and verification comparison only.

SS-31 vs MOTS-c · research class comparison

SS-31 vs MOTS-c: both called mitochondrial peptides, but not the same kind of molecule.

SS-31 and MOTS-c get grouped together because both show up in mitochondrial research, and search results blur them into a single 'mitochondrial peptide' bucket. In chemistry and origin they are quite different. SS-31 (Elamipretide) is a synthetic four-residue aromatic-cationic peptide — built with two non-standard residues — that is studied for associating with the inner mitochondrial membrane; it is a compound designed to be targeted to the mitochondria. MOTS-c is a 16-residue peptide encoded within the mitochondrial 12S rRNA region — a mitochondrial-derived peptide, a sequence that comes from the mitochondria. Targeted-to versus derived-from is the whole difference, and it changes how each one is made, how long its sequence is, and — most importantly for a buyer — how a credible release sheet has to verify it. This page lays out the split in plain research terms. It makes no cardiac, metabolic, longevity, energy, or human-use claim about either compound, and neither SS-31 nor MOTS-c is a core Titan catalog SKU — the honest routing is covered below.

See what Titan actually stocks How to verify a COA

SS-31 is targeted TO the mitochondria

SS-31 (Elamipretide, MTP-131) is a synthetic tetrapeptide — D-Arg-2',6'-dimethyltyrosine-Lys-Phe-NH2 — engineered as an aromatic-cationic sequence studied for its association with the inner mitochondrial membrane. It is a designed compound: two of its four residues are non-standard building blocks (a D-arginine and a doubly-methylated tyrosine). It is not something a cell transcribes; it is something a chemist makes to reach a mitochondrial compartment. That 'targeted-to' character is what defines it as a research tool.

Where to buy SS-31 →

MOTS-c is derived FROM the mitochondria

MOTS-c (mitochondrial open reading frame of the 12S rRNA type-c) is a 16-residue peptide encoded within mitochondrial DNA itself — a mitochondrial-derived peptide. Unlike SS-31, it is a genuine biological sequence of standard amino acids, studied as a signalling peptide of mitochondrial origin. In practical supply terms it behaves like other research peptides: synthesised to a defined 16-mer sequence, supplied as a lyophilized powder, and verified by the correct sequence and mass. Derived-from, not targeted-to — the opposite relationship to the mitochondria.

Where to buy MOTS-c →

Why they get searched together

Both live in the same corner of the literature — mitochondrial biology and cellular bioenergetics — so search engines and forums bundle them under 'mitochondrial peptides.' That shared topic is real, but a shared research area is not a shared molecule. One is a synthetic four-residue peptide with unnatural building blocks; the other is a natural 16-residue sequence encoded by mitochondrial DNA. Understanding that they sit on opposite sides of the 'targeted-to versus derived-from' line is the whole point of comparing them, and it is a mechanistic comparison only — no outcome, benefit, or efficacy is claimed for either.

MOTS-c vs NAD+ (another class split) →

The release sheets verify different things

This is where the difference stops being academic. For SS-31 — a four-residue peptide with unnatural residues — a credible certificate has to prove the D-arginine and the 2',6'-dimethyltyrosine are actually present: accurate-mass MS (the dimethyl group is ~28 Da, easy to miss if it's plain tyrosine) plus an orthogonal chirality check, resolved against an HPLC chromatogram. For MOTS-c — a 16-residue sequence of standard amino acids — the certificate confirms the correct 16-mer sequence by mass spectrometry with HPLC purity, and watches for truncated sequences. Same 'mitochondrial peptide' label, two entirely different verification jobs.

How to read a peptide COA →

Length and building blocks set them apart

Four residues versus sixteen is not a trivial difference. SS-31's short length concentrates the whole molecule's identity into two unusual residues, so its verification is about proving those residues are correct. MOTS-c's longer chain means more sequence to synthesise correctly and more places a truncation or deletion can hide, so its verification is about confirming the full sequence end to end. A vendor that prints one generic 'tested' badge for both is telling you it has not thought about which problem it is actually solving.

Current-lot COA checklist →

What Titan actually stocks

Titan's RUO catalog is a focused set of in-house-tested research peptides — BPC-157, TB-500, retatrutide, the CJC-1295 + Ipamorelin blend, and a line of pre-mixed nasal-format peptides — rather than every compound the internet groups under 'mitochondrial research.' Neither SS-31 nor MOTS-c is a core catalog SKU, so instead of implying a product it does not verify, Titan points researchers to the compounds it does test and to the verification standard that separates a real release sheet from a badge. The where-to-buy pages above cover the honest sourcing context for each.

Best research peptides (in stock) →

The detail, in plain terms

The split, in plain terms.

SS-31 and MOTS-c overlap in research topic, not in origin or chemistry. One is a synthetic four-residue peptide targeted to the mitochondria; one is a natural 16-residue peptide derived from mitochondrial DNA. That difference decides how each is made, how long its sequence is, and — the part a buyer should care about — how it is verified.

SS-31 — what it is: Synthetic four-residue aromatic-cationic peptide (Elamipretide); two non-standard residues.
MOTS-c — what it is: 16-residue mitochondrial-derived peptide encoded within the 12S rRNA region; standard residues.
Relationship to mitochondria: SS-31 is targeted TO the membrane; MOTS-c is derived FROM mitochondrial DNA.
SS-31 identity check: Accurate-mass MS for D-Arg + dimethyltyrosine (~28 Da) + orthogonal chirality check, HPLC-resolved.
MOTS-c identity check: Correct 16-mer sequence by mass spectrometry + HPLC purity, watch for truncation, lot-matched.
Titan stocks: Neither is a core SKU — honest redirect to in-catalog tested peptides.

Questions researchers ask

Before you order.

Are SS-31 and MOTS-c the same thing?: No. Both get filed under 'mitochondrial peptides,' but they are different molecules. SS-31 (Elamipretide) is a synthetic four-residue aromatic-cationic peptide with two non-standard residues, studied for associating with the inner mitochondrial membrane. MOTS-c is a 16-residue peptide encoded within mitochondrial DNA. One is targeted to the mitochondria, one is derived from them. This is research framing only, not a human-use comparison.
What does 'targeted-to versus derived-from' mean here?: It is the cleanest way to keep the two apart. SS-31 is a designed compound built to reach and associate with the inner mitochondrial membrane — it is targeted TO the mitochondria. MOTS-c is a peptide whose sequence is encoded within mitochondrial DNA itself — it is derived FROM the mitochondria. They sit on opposite sides of that relationship, which is why they are prepared and verified differently despite sharing the 'mitochondrial peptide' label.
Should an SS-31 COA and a MOTS-c COA look the same?: No, and that is the practical takeaway. An SS-31 release sheet has to prove its two unnatural residues — the D-arginine (a chirality check ordinary purity runs miss) and the 2',6'-dimethyltyrosine (roughly 28 Da that a plain-tyrosine impostor would lack) — by accurate-mass MS with the HPLC chromatogram. A MOTS-c certificate confirms the correct 16-residue sequence by mass spectrometry with HPLC purity and watches for truncated sequences. A single generic 'tested' badge covering both is a red flag.
Does Titan sell SS-31 or MOTS-c?: Neither is a core Titan catalog product. Titan's RUO line centers on in-house-tested research peptides such as BPC-157, TB-500, retatrutide, the CJC-1295 + Ipamorelin blend, and pre-mixed nasal-format peptides. Rather than list compounds it does not verify in-house, Titan points researchers to what it does stock and to the COA standard that applies to any research compound. The where-to-buy pages cover the honest sourcing context.
Are SS-31 or MOTS-c for human use?: No. Anything discussed here is strictly for in-vitro laboratory research. Neither SS-31 nor MOTS-c is for human or animal consumption, diagnostic, therapeutic, or preventative use, and no cardiac, metabolic, longevity, or energy outcome is claimed for either. Nothing on this page is a dosing schedule or a human-use protocol — it is a chemistry and verification comparison only.