Peptide profile · Mitochondrial
SS-31 (Elamipretide)
A revolutionary mitochondria-targeting peptide that works like a direct energy boost for your cells—binding to cardiolipin in your mitochondria to supercharge ATP production, reduce oxidative stress, and protect your cellular powerhouses from age-related decline [1].
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team
Typical dose
40 mg
Half-life
3-4 hours
Bioavailability
~92% (subcutaneous)
Molecular weight
639.8 g/mol
Evidence level
Moderate human trials
01 · Compound profile
Scientific & efficacy data
Molecular formula
C32H49N9O5
Primary benefits
Directly targets and stabilizes cardiolipin in the inner mitochondrial membrane—the only peptide with this validated mechanism of action
Enhances ATP production by optimizing electron transport chain efficiency and reducing energy-wasting reactive oxygen species
Reduces oxidative stress at its source—inside the mitochondria where most ROS are produced—rather than just scavenging after the fact
Weill Cornell Medical College / University of Montreal
Amino acid sequence
D-Arg-dimethylTyr-Lys-Phe-NH202 · Dosing
How much do I take?
40 mg · once daily
Subcutaneous: A small injection into the fatty layer just under the skin — the same way insulin is given.
Bioavailability High — most of the dose reaches your bloodstream, just more gradually than an IV.
Best time to take
Morning injection is often preferred since SS-31 supports cellular energy production—aligning with your active hours makes sense [1]. However, timing is flexible based on your schedule.
With food?
SS-31 can be taken regardless of food timing. The peptide is absorbed efficiently whether you've eaten or not, so fit it into whatever routine works best for you.
＋ Increase if
- +You've completed 2+ weeks at starting dose with no issues
- +You're following a research protocol calling for standard doses
- +Your healthcare provider recommends advancement based on your goals
－ Decrease if
- −You experience persistent injection site reactions beyond 48 hours
- −Headaches or nausea don't improve after the first week
- −Any unexpected or uncomfortable side effects arise
- −You have any kidney function concerns
✓ Signs of right dose
- ✓Improved energy levels, especially sustained throughout the day
- ✓Better exercise tolerance or recovery
- ✓No significant injection site issues
- ✓General sense of vitality maintained or enhanced
Dosing Calculator
Calculate Your Exact Dose
Step 1: Peptide Weight
Find the weight printed on your peptide vial label
Look here!
The peptide weight is printed on the label
Look here!
The weight is on the label
Select Weight
Look for a number followed by 'mg' on the vial label (e.g., 5mg, 10mg)
03 · Suitability
Is this right for me?
Best for mitochondrial health optimization & cellular energy enhancement
Best for
Mitochondrial Health Enthusiasts
If you're focused on optimizing cellular energy at the most fundamental level, SS-31 targets the actual machinery inside your mitochondria. It binds to cardiolipin—the special fat molecule that holds your electron transport chain together—keeping your cellular powerhouses running smoothly [1][2].
Aging Adults Concerned About Cellular Decline
Mitochondrial dysfunction is now recognized as a hallmark of aging [14]. Your cells' energy factories get less efficient over time, producing more harmful byproducts. SS-31 helps protect and restore mitochondrial function, addressing one of the root causes of age-related decline [1].
Heart Health Supporters
Your heart is one of the most energy-demanding organs, packed with mitochondria. Clinical trials have studied SS-31 in heart failure patients because cardiac cells are especially vulnerable to mitochondrial dysfunction [1]. Supporting heart mitochondria supports overall cardiovascular function.
Those Recovering from Oxidative Stress
Whether from intense exercise, illness, or environmental factors, oxidative stress damages your mitochondria from the inside out. SS-31 works as an antioxidant exactly where reactive oxygen species are produced—right at the inner mitochondrial membrane—neutralizing them before they cause harm [1].
Consider alternatives if
Do not use if
Use with caution if
Not sure?
Compare SS-31 (Elamipretide) with similar peptides to find the best fit for your goals.
04 · Administration
How do I use it?
Subcutaneous injection · Intravenous infusion
Reconstitution — what you need
Example
If you have a 50 mg vial and add 2.5 mL of bacteriostatic water, you get a concentration of 20 mg/mL. So 0.5 mL (50 units on an insulin syringe) equals 10 mg of SS-31, and 2 mL (200 units) equals the full 40 mg dose.
For a 40 mg dose at 20 mg/mL concentration: draw 2 mL. For a 20 mg dose: draw 1 mL. For a 10 mg dose: draw 0.5 mL (50 units).
Route
Subcutaneous injection (just under the skin)—the standard method used in clinical trials with approximately 92% bioavailability
Best sites
Technique
- 01Wash your hands thoroughly with soap and water
- 02Clean the injection site with an alcohol swab and let it air dry completely
- 03Pinch about an inch of skin to create a fold of fatty tissue
- 04Insert the needle at a 45-90 degree angle (45 if lean, 90 if you have more subcutaneous tissue)
- 05Inject the solution slowly and steadily
- 06Wait 5-10 seconds before withdrawing the needle
- 07Apply light pressure with a clean swab if needed—do not rub
Storage · before reconstitution
Store lyophilized SS-31 powder in the refrigerator at 36-46°F (2-8°C). For long-term storage beyond 3 months, keep frozen at -4°F (-20°C) or below. Keep in the original sealed vial away from light. Properly stored powder remains stable for up to 2 years frozen.
Storage · after reconstitution
Refrigerate reconstituted SS-31 at 36-46°F (2-8°C). Never freeze once reconstituted—freezing destroys peptide structure. Protect from light and use within 28 days of reconstitution.
Signs of degradation
Sample daily schedule
05 · Safety
Is it safe?
4 common side effects · 1 serious
SS-31 (elamipretide) has demonstrated a favorable safety profile across multiple clinical trials, including studies lasting up to 24 weeks [10]. The most common adverse events are mild injection site reactions [6][10]. In September 2025, elamipretide received FDA approval for Barth syndrome, validating its safety in that population [8][9]. Most side effects are mild to moderate and typically resolve with continued use or dose adjustment.
Safety data comes from Phase 1-3 clinical trials in various populations including heart failure patients, those with primary mitochondrial myopathies, and Barth syndrome patients [1][6]. While generally well-tolerated, long-term safety beyond 6 months requires more data in healthy populations. Always work with a healthcare provider when using this compound.
Common side effects · experienced by some users
Less common
These typically resolve with continued use or dose adjustment.
Stop and seek help if
- ×Any signs of allergic reaction—stop immediately and seek medical attention
- ×Injection site reactions that spread, worsen, or show signs of infection
- ×Persistent nausea, headaches, or dizziness that don't improve after 2 weeks
- ×Development of kidney-related symptoms (significant changes in urination, swelling)
- ×Any side effect that feels serious or significantly impacts your quality of life
- ×Your healthcare provider advises discontinuation
SS-31 (elamipretide) is FDA-approved only for Barth syndrome. For other uses, it remains a research compound. Never start, stop, or adjust your protocol without guidance from a qualified healthcare provider. This information is for educational purposes only and is not medical advice.
With other peptides
- ✓Epithalon — Potentially synergistic pairing—Epithalon targets telomeres while SS-31 targets mitochondria, addressing two major aging mechanisms simultaneously.
- ✓BPC-157 — Can be combined for comprehensive cellular protection and healing support. Inject at different sites.
- ✓MOTS-c — Both target mitochondrial function through different mechanisms. May have additive effects but combined use hasn't been extensively studied.
- ✓GHK-Cu — Safe combination for multi-pathway anti-aging approach. Different mechanisms of action without known interactions.
With medications
- !Nephrotoxic drugs (aminoglycosides, NSAIDs) — SS-31 is excreted by the kidneys. Combining with kidney-stressing medications may increase risk of renal issues. Consult your doctor.
- ✓Diabetes medications (metformin, insulin) — Both may affect mitochondrial function or glucose metabolism. Monitor blood sugar more closely during SS-31 use.
- ✓Blood thinners (warfarin, aspirin) — May increase bruising at injection sites. Not dangerous but worth monitoring. Inform your healthcare provider.
- ✓Heart failure medications — SS-31 has been studied in heart failure patients alongside standard medications. Generally compatible but always inform your cardiologist.
With supplements
- ✓CoQ10 (Ubiquinol) — Excellent synergy—both support mitochondrial electron transport chain function through complementary mechanisms.
- ✓NAD+ precursors (NMN, NR) — Potentially beneficial combination for comprehensive mitochondrial support. NMN supports NAD+ levels while SS-31 protects mitochondrial structure.
- ✓PQQ — May work synergistically to support mitochondrial biogenesis and function. Both target different aspects of mitochondrial health.
- ✓Alpha-lipoic acid — Both have antioxidant properties. Safe combination that may provide enhanced mitochondrial protection.
- ✓High-dose iron supplements — Iron can catalyze oxidative reactions in mitochondria. Avoid taking high-dose iron supplements simultaneously—space them out.
06 · Effectiveness
How do I know it's working?
Moderate human trials · first signs days 1-7
Evidence level
Moderate human trials
(Phase 1-2)
How it works
Think of your cells like tiny cities, and mitochondria are the power plants that keep everything running. Inside each power plant is a special membrane with folds called cristae—this is where your cells actually make energy (ATP). A fatty molecule called cardiolipin holds this whole structure together like molecular glue. As we age or face stress, cardiolipin gets damaged and the power plant structure falls apart, making less energy and more pollution (oxidative stress) [13]. SS-31 is like a repair crew that goes directly to the cardiolipin and stabilizes it [1]. When the structure stays intact, your power plants work better—more energy, less cellular pollution, healthier cells [1].
Elamipretide (SS-31) is a synthetic tetrapeptide (D-Arg-dimethylTyr-Lys-Phe-NH2) with unique cell-penetrating and mitochondria-targeting properties [1][3]. Its alternating cationic (Arg, Lys) and aromatic (dimethylTyr, Phe) residues enable rapid cellular uptake independent of mitochondrial membrane potential and selective accumulation (several thousand-fold) in the inner mitochondrial membrane (IMM) [3][11]. SS-31 selectively binds to cardiolipin (CL), an anionic phospholipid unique to the IMM that constitutes approximately 20% of IMM lipid content [1][12]. CL is essential for: (1) organizing respiratory chain supercomplexes, (2) maintaining cristae ultrastructure, and (3) proper function of cytochrome c oxidase and other electron transport chain components [2]. By stabilizing CL and modifying membrane electrostatics, SS-31 optimizes electron transfer efficiency, increases ATP synthesis, and reduces electron leak that generates reactive oxygen species (ROS) [1][3]. Additionally, SS-31 prevents CL peroxidation and translocation to the outer membrane—processes that would otherwise trigger cytochrome c release and apoptosis [5]. Cross-linking mass spectrometry has identified SS-31 binding partners including ATP synthase, complex III, complex IV, and enzymes in 2-oxoglutarate metabolism, all of which are established CL-interacting proteins [2]. This multi-target mechanism explains SS-31's broad therapeutic potential across conditions involving mitochondrial dysfunction [1].
What to expect
Days 1-7
What you might notice
- •Injection site reactions are most common during this period
- •Possible mild headache or fatigue as your body adjusts
- •Some people notice subtle energy changes
- •Most users don't feel dramatic differences yet
What's normal
- •Mild injection site redness that fades within 24-48 hours
- •Feeling slightly tired or having mild headaches initially
- •No immediate dramatic changes—SS-31 works at the cellular level
What's next
- →Continue your daily protocol consistently
- →Track any effects or side effects in a simple log
- →Initial side effects typically improve after day 5-7
Weeks 2-4
What you might notice
- •Side effects usually diminish significantly
- •May start noticing improved energy levels
- •Some report better exercise tolerance
- •Sleep quality may improve
What's normal
- •Fewer injection site reactions as you rotate sites
- •Gradual sense of improved vitality
- •Feeling adjusted to the daily routine
What's next
- →Maintain consistent daily dosing
- →Consider if dose adjustment is appropriate
- →Continue tracking your response
Weeks 4-8+
What you might notice
- •Sustained improvements in energy and vitality
- •Better recovery from physical exertion
- •Overall sense of cellular health optimization
- •Effects stabilize at their optimal level
What's normal
- •Consistent well-being without significant side effects
- •Maintained energy levels throughout the day
- •Feeling the compound has reached its steady-state effect
What's next
- →Discuss with your healthcare provider about continuing or cycling
- →Some protocols suggest cycling off periodically
- →Evaluate your goals and whether to continue
Signs it's working · Energy and Vitality
- ✓Improved sustained energy throughout the day
- ✓Less afternoon energy crashes
- ✓Better stamina during physical activities
- ✓Feeling more mentally alert
- ✓Waking up feeling refreshed
Signs it's working · Physical Performance
- ✓Improved exercise tolerance
- ✓Faster recovery after workouts
- ✓Better endurance during cardio activities
- ✓Reduced muscle fatigue during exertion
Signs it's working · General Well-Being
- ✓Overall sense of vitality and wellness
- ✓Improved stress resilience
- ✓Better sleep quality
- ✓Feeling more robust and healthy
Not seeing results? Common reasons
- •Expecting immediate dramatic results—SS-31 works at the cellular level and effects are often subtle and gradual
- •Inconsistent dosing—daily consistency is important for achieving steady-state levels
- •Poor quality peptide from unreliable source—always verify purity with third-party certificates of analysis
- •Improper storage that degraded the peptide—verify your solution is clear before each use
- •Underlying health issues affecting mitochondrial response—some conditions may require higher doses or longer treatment
- •Not supporting overall mitochondrial health—diet, sleep, and lifestyle factors significantly impact results
Key research
07 · Questions
Frequently asked
What makes SS-31 different from other mitochondrial supplements like CoQ10?+
CoQ10 is an electron carrier that participates in the electron transport chain, while SS-31 targets the structural foundation—cardiolipin—that holds the entire energy-producing machinery together [1][2]. Think of CoQ10 as providing fuel, while SS-31 repairs and maintains the engine itself. They work through completely different mechanisms and can actually complement each other.
Is SS-31 FDA approved?+
Yes, elamipretide (the pharmaceutical name for SS-31) received FDA approval in September 2025 for treating Barth syndrome, a rare genetic mitochondrial disorder [8]. This makes it the first FDA-approved medication specifically targeting mitochondria [9]. For other uses like general anti-aging or performance, it remains a research compound.
How long does it take to feel effects from SS-31?+
Most people notice subtle improvements in energy and vitality within 2-4 weeks of consistent daily use. However, SS-31 works at the cellular level, so effects are often gradual rather than dramatic. In the uncontrolled extension of the Barth syndrome trial, improvements continued over 12-24 weeks, but the controlled 24-week trial in mitochondrial myopathy did not show a treatment benefit [10].
Can I take SS-31 if I don't have a mitochondrial disease?+
SS-31's FDA approval is specifically for Barth syndrome, but research interest extends to general mitochondrial dysfunction associated with aging, heart failure, and other conditions [1][8]. For healthy individuals interested in mitochondrial optimization, it remains a research compound and should only be used under medical supervision.
Why is SS-31 injected rather than taken orally?+
As a peptide, SS-31 would be broken down by digestive enzymes if taken orally. Subcutaneous injection allows the full molecule to enter your bloodstream intact, achieving approximately 92% bioavailability [8]. The peptide then crosses cell membranes and concentrates specifically in mitochondria [3].
Does SS-31 have any effects on weight or body composition?+
SS-31 isn't a weight loss compound, but by improving mitochondrial function it could theoretically support better metabolism. Some research in cancer cachexia (muscle wasting) showed SS-31 helped preserve muscle mass by maintaining mitochondrial energy production [16]. However, it's not marketed or studied primarily for weight management.
Can SS-31 help with brain health and cognitive function?+
Research shows SS-31 has neuroprotective effects in models of spinal cord injury and neurodegeneration [5]. Your brain cells are packed with mitochondria and highly sensitive to energy deficits. By protecting brain mitochondria, SS-31 could theoretically support cognitive health, though more human studies are needed.
Is it safe to use SS-31 long-term?+
Clinical trials have studied SS-31 use for up to 24 weeks with a good safety profile—most side effects are mild injection site reactions [10]. However, multi-year safety data in healthy populations is still being gathered. Work with a healthcare provider to determine appropriate cycle lengths and monitoring for your situation.
08 · Further reading
History & related research
History · since 2004
The Accidental Discovery That Rescued Dying Mitochondria
Born from a failed painkiller experiment, SS-31 became the world's first FDA-approved drug to target mitochondria — but only after surviving stock crashes, trial failures, and a company on the brink of collapse.
Read the full history of SS-31 (Elamipretide)Studied for