Mitochondria · Longevity
SS-31 / Elamipretide
A mitochondria-targeting peptide with a narrow accelerated approval and a much broader set of unproven anti-ageing claims.
- How settled this rating is:
- low confidence in the current evidence rating
- Routes studied:
- Subcutaneous injection
- Also known as:
- elamipretide, MTP-131, Bendavia
- Last reviewed:
- 2026-09-07
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Evidence passport
SS-31 / Elamipretide
A one-screen evidence identity for this compound. These fields describe research maturity, confidence and legal status. They are not a safety guarantee, efficacy percentage or recommendation.
- Evidence level
- L3Early human studies
- Confidence
- Low confidence in rating
- Regulatory status
- Approved for a specific indication · See jurisdiction details
- Development status
- Approved
Evidence strength
Higher = more and better-quality human evidence. It does not mean the effect is bigger or that the compound works for you.
Higher = more mature, better-documented human safety data. It does not mean the compound is safer than one with a lower number.
The 0-100 values rate the strength and maturity of evidence, not how effective or safe the compound is.
- Evidence base
- Includes human studies
- Furthest established stage
- Approved
- Human research maturity
- Approved for one rare disease; investigational or unestablished elsewhere
- Source curation
- Sources fully curated
Routes recorded
Overview
Higher = more and better-quality human evidence. It does not mean the effect is bigger or that the compound works for you.
Higher = more animal, tissue or cell research. Preclinical results are a starting point, not proof of a human benefit.
Higher = more mature, better-documented human safety data. It does not mean the compound is safer than one with a lower number.
How to read these scores
Every number here rates the evidence, not the compound. They are editorial 0-100 strength ratings, not percentages, and not a rating out of five stars.
- Human efficacy evidence strength — Higher = more and better-quality human evidence. It does not mean the effect is bigger or that the compound works for you.
- Preclinical evidence strength — Higher = more animal, tissue or cell research. Preclinical results are a starting point, not proof of a human benefit.
- Human safety evidence strength — Higher = more mature, better-documented human safety data. It does not mean the compound is safer than one with a lower number. A score of 80 does not mean “80% safe”.
- Evidence level (L0-L5) — the strongest type of study behind the compound, from anecdote (L0) to large replicated human trials (L5). It is a description of the study evidence, not a quality, safety or recommendation rating.
- Confidence — how likely we think it is that this rating changes as new research lands. Low confidence means the picture is unsettled, not that the compound is bad.
None of these ratings is medical advice, a safety guarantee, or a recommendation to use anything. How we grade evidence.
How far human research has progressed: Approved for one rare disease; investigational or unestablished elsewhere
Routes & formulations
Studied / approved routes
The approved product (Forzinity) is a subcutaneous injection studied specifically in Barth syndrome. Route, dose and population are tied to that programme; nothing transfers to anti-ageing use.
Route availability is not evidence of efficacy, and evidence from one route does not transfer to another. The Registry never provides dosing or sourcing information.
Peptide lifecycle
Discovery
Preclinical
Phase I
Phase II
Phase III
Approved
Accelerated US approval (September 2025) for Barth syndrome, contingent on a confirmatory trial; programmes in broader indications produced mixed or unsuccessful results.
What it is
A small peptide that concentrates in mitochondria and binds cardiolipin, a lipid essential to the structure of the inner mitochondrial membrane and to efficient energy production.
What people claim
- Restores youthful mitochondrial function
- Improves endurance and recovery
- Slows ageing
- Improves heart and kidney outcomes
What the evidence actually says
This is a textbook case of why 'approved' needs a footnote. Elamipretide has real human data and a genuine accelerated approval in a rare mitochondrial disease. Trials in broader indications — including some cardiac and ophthalmic programmes — have produced mixed or unsuccessful results. General anti-ageing and performance use is unestablished.
Related evidence
Useful next reads based on this compound — not recommendations.
- Related compound
MOTS-c evidence profile
A mitochondrial-derived peptide with genuinely interesting biology and thin translational data.
- Compare
Compare SS-31 / Elamipretide vs MOTS-c evidence
Same questions, same fields, side by side — including how much human evidence exists.
- Checked claim
Claim review: “Elamipretide is an approved anti-ageing therapy.”
Our verdict on this exact wording, with the reasoning behind it.
- Context
Safety Centre
What approved, investigational and unapproved actually mean for documented human safety.
Human evidence
- Clinical trial programme in Barth syndrome supporting accelerated approval.
- Mixed results across trials in primary mitochondrial myopathy and other indications.
- No trials supporting healthy-ageing or athletic-performance claims.
Preclinical evidence
- Strong animal and cell evidence for improved mitochondrial respiration and reduced oxidative stress.
- Models of ischaemia-reperfusion injury, heart failure and age-related muscle decline.
Animal and cell findings are Level 1–2 evidence.
Mechanism and pathways
- Binds cardiolipin, stabilising cristae structure in the inner mitochondrial membrane.
- Improves electron transport chain efficiency and reduces reactive oxygen species leakage.
Safety and unknowns
- Injection-site reactions are commonly reported in trials.
- Human safety data exist for studied indications and doses — a meaningful advantage over most research peptides.
- Safety in healthy people using it for performance is not established.
- Separately from the molecule: FDA warning letters dated 24 August 2026 name US vendors selling unapproved injectable products labelled 'SS-31 (Elamipretide)'. Those are not the approved Forzinity product. This is a product-quality and supply-chain risk, not evidence that pharmaceutical-grade elamipretide has developed a new toxicity signal.
Cancer relevance
This section covers questions raised by how the compound works in the body, plus anything regulators and trial teams keep an eye on. It is not a statement that this compound causes cancer — for most compounds here, no human data exist in either direction.
No established human signal
Regulatory status
Regulatory decisions apply to specific jurisdictions, products, formulations and indications. An approval elsewhere is not automatically an approval in your country.
Named regulators: FDA (US)
On 19 September 2025 the FDA granted accelerated approval to Forzinity (elamipretide) injection to improve muscle strength in patients with Barth syndrome weighing at least 30 kg — based on a surrogate endpoint, with a confirmatory trial still required. That approval says nothing about general anti-ageing, athletic or longevity use, where it remains unapproved and unestablished. On 24 August 2026 the FDA issued warning letters to Royal Peptides LLC, Peptide Partners LLC and TXP Innovations LLC (Tex Peptides) identifying vendor products labelled 'SS-31 (Elamipretide)' as unapproved new drugs; those products are not the approved Forzinity medicine, and FDA noted that injectable products sold this way are especially concerning because injection bypasses key body defences.
- 2025-09-19 · United States
FDA granted accelerated approval to Forzinity (elamipretide) for Barth syndrome in patients weighing at least 30 kg, on a surrogate endpoint with a confirmatory trial required. Does not cover anti-ageing or performance use.
Key study types
- L4Good human trialsBarth syndrome clinical programme
Randomised and open-label extension — Patients with a rare mitochondrial genetic disease
Supported accelerated approval in that narrow indication only.
Evidence grade
Preliminary human outcome research, including small or observational studies. Descriptive exposure studies alone do not demonstrate therapeutic benefit.
What would change our rating?
- Positive confirmatory trials in broader indications.
- Any controlled trial in healthy ageing populations.
References and sources
Source transparency
A provenance snapshot of this profile. Counts show what kinds of sources are cited, not how much scientific weight each source deserves.
- Last editorial review
- 2026-09-07
- Recently reviewed · 39 days ago
- Linked curated sources
- 4
- Sources still pending
- 0
- External specialist reviews
- 0
- None recorded for this profile
Review provenance
Registry editorial review: Colin Jackson-White, creator and editor, who is not a doctor or clinician. External specialist review is credited only when a named reviewer has completed a review of this exact profile.
Literature-discovery and AI tools may help locate or challenge candidate evidence, but they are not counted as evidence sources here. Registry judgements are tied to the underlying papers, trial records, regulator documents and official study records.
- Regulatory / labelFDA press release — Accelerated approval of Forzinity (elamipretide) as first treatment for Barth syndrome (19 September 2025)
- Regulatory / labelFDA warning letter — Royal Peptides LLC (24 August 2026)
- Regulatory / labelFDA warning letter — Peptide Partners LLC (24 August 2026)
- Regulatory / labelFDA warning letter — TXP Innovations LLC dba Tex Peptides (24 August 2026)
Source hierarchy: regulatory documents and trial registries first, peer-reviewed work next, sponsor material flagged as non-independent. We never use supplier or clinic marketing as evidence, and where a verified source has not yet been curated we say so rather than inventing one.
Evidence change history
These entries record changes to our assessment of the published evidence — not changes to the compound itself.
- Change 1 of 1L3Early human studiesEvidence rating changedBaseline entryA rare-disease accelerated approval justifies a higher regulatory status but not higher confidence in longevity or performance claims. The registry now separates the two explicitly.
Related claims we’ve checked — in full
Claim verdict
Mitochondria
“Elamipretide is an approved anti-ageing therapy.”
This verdict applies to the exact claim above. It is not a verdict on the compound overall, a safety guarantee, or a recommendation to use it.
Registry verdict
Misleading — it holds a narrow accelerated approval for a rare genetic disease.
Why this verdict
- Approval for Barth syndrome does not extend to healthy ageing, performance or general mitochondrial 'optimisation'.
- Trials in broader indications have produced mixed or unsuccessful results.
- Reading a rare-disease approval as an anti-ageing endorsement is one of the most common errors in this space.