SS-31: the complete guide.

The short version.

If you read nothing else, read this. The whole guide in a handful of bullets.

Quick reference.

What is SS-31?

SS-31 is a short peptide, which simply means a small chain of amino acids, the same building blocks that make up the proteins in your body. It is made of just four of them, so it is called a tetrapeptide. Its formal research name is elamipretide.

What makes SS-31 unusual is where it goes. After it enters a cell, it concentrates inside the mitochondria, the tiny structures that turn food and oxygen into usable energy. It does this by binding to cardiolipin, a fatty molecule found almost nowhere else in the body except the inner mitochondrial membrane.

The version sold by vendors arrives as a freeze-dried white powder in a small sealed vial. It is not a steroid, not a hormone, and not a stimulant. People reach for it because it is studied for one theme above all: keeping mitochondria working well, which matters for energy, recovery, and the aging process.

Worth saying plainly: the drug version of this peptide, elamipretide, was FDA-approved in 2025 for a rare genetic disease called Barth syndrome. The SS-31 vendors sell is research-grade material, not that approved medicine, and it is sold strictly for research use only. General anti-aging claims in healthy people are not proven. We get into what that means further down.

How it works in the body.

You do not need a biology degree to follow this. Here is the simple picture, then a little more for the curious.

The core idea is that SS-31 works on your mitochondria, the cell's power plants. When mitochondria age or get stressed, the membrane inside them loses its shape and they produce less energy while leaking more damaging byproducts. SS-31 is studied for protecting that membrane.

• Cardiolipin binding. SS-31 attaches to cardiolipin, a lipid that holds the inner mitochondrial membrane in its folded shape. By stabilizing it, the peptide helps the membrane keep the structure the energy machinery depends on.
• Cleaner energy production. With the membrane stabilized, the electron transport chain, the assembly line that makes ATP, runs more efficiently and leaks fewer reactive byproducts. That means more energy and less oxidative stress.
• Targeted accumulation. The peptide concentrates strongly inside mitochondria, hundreds to thousands of times over, so it acts right where energy is made rather than scattering through the whole cell.

How to take it: routes of administration.

SS-31 is an injectable peptide. It is given subcutaneously, the same route used in the clinical trials. It is not a meaningful oral option, so the real choice is just where on the body you inject. Here is the honest comparison.

Where to inject.

If you go this route, these are the sites people use. Rotate so no single area gets sore.

The easiest spots are the belly (about 2 inches either side of the navel), the love handles, the front of the thigh, and the back of the upper arms. Rotate every injection.

So which should a beginner pick? For almost everyone running SS-31 outside a clinic, subcutaneous is the only realistic answer: absorption is reliable, the needle is tiny, and it matches how the peptide was studied. The intravenous route belongs to clinical trials, and oral simply does not work.

Reconstitution: mixing it.

SS-31 arrives as a dry powder, so before you can inject it you reconstitute it, which just means adding liquid to turn the powder into something you can draw into a syringe. It sounds technical but takes about a minute.

Once it is mixed, the only real question is how many units to draw. That depends on your vial size, your water amount, and your target dose, and it is easy to get wrong by hand.

• Use bacteriostatic water, often called BAC water. The small amount of preservative keeps the mixed vial usable for weeks.
• Add the water slowly, down the inside wall of the vial. A common mix is a 10 mg vial plus 2 mL of BAC water, which gives a concentration of 5 mg/mL.
• Swirl, do not shake. Gently roll the vial until the powder dissolves. Shaking can damage the peptide.
• Store it in the fridge once mixed, and keep it out of direct light.

Open the dosage calculator to turn your vial and dose into an exact number of units. As a worked example: a 10 mg vial mixed with 2 mL of BAC water gives 5 mg/mL, so a 5 mg dose is 1.0 mL, which is 100 units on a U-100 insulin syringe, and that vial holds about 2 doses.

Dosing by goal.

There is no single official dose for research SS-31, because the material vendors sell is not an approved medicine. What follows is the range people commonly run, alongside the much higher dose used in the approved drug, so you can see the gap.

Community research dose

The most common pattern in research and hobbyist use is about 5 to 10 mg once daily, usually taken in the morning. People run this through a defined cycle rather than indefinitely.

Clinical drug dose

For context, the approved drug elamipretide is dosed at 40 mg daily subcutaneously for Barth syndrome. That is several times higher than what hobbyists typically run, and it is given under medical supervision. The gap is worth knowing before you copy any number.

Stacked with MOTS-c

SS-31 is often run alongside MOTS-c, the other popular mitochondrial peptide. MOTS-c is typically dosed around 1 mg daily and works through a different pathway, so the two are run together in the same block for a broader effect on cellular energy.

Cycling and timing.

A cycle just means a defined run of time on the peptide, followed by a break. For SS-31 the common pattern is roughly eight weeks of daily dosing, then time off, rather than running it indefinitely.

Why not just run it forever? Mostly because the long-term human safety data outside of disease trials does not exist yet. The cautious and widely followed approach is to run a focused block, then stop and reassess.

• Hold the schedule through your cycle, once daily at roughly the same time each morning.
• Take a real break after about eight weeks before considering another cycle.
• Reassess with a provider if you are using it for a specific goal. Chasing a bigger dose is not the move; consistency is.

Stacking SS-31.

SS-31 is often run alongside other mitochondrial and longevity peptides. The most popular pairing is with the other mitochondrial peptide people talk about, MOTS-c.

See full recipes, dosing, and how people run them on the stacks page.

Side effects and safety.

In the trials and reports we see, SS-31 is generally described as well tolerated, with side effects that tend to be mild and centered on the injection itself. The ones people mention most often are:

• Injection-site reactions, by far the most common: redness, itching, swelling, or a small bump. Rotating sites helps.
• Headache or dizziness, sometimes reported, usually mild.
• Mild stomach upset, such as nausea, abdominal discomfort, or gas.
• Fatigue, which a few people describe early in a cycle.

Who should be cautious.

Some people have clear reasons to be extra careful, or to avoid SS-31 entirely until they have spoken with a licensed provider.

• Pregnant or breastfeeding. There is no safety data here, so this is a hard avoid.
• Anyone with a serious heart or mitochondrial condition. SS-31 acts directly on energy metabolism in the heart and muscles, so self-dosing around a diagnosed condition is a conversation for your physician, not a forum.
• Competing athletes. SS-31 is not explicitly named on WADA's list, but unapproved substances can be treated as prohibited, so verify with your anti-doping authority first.
• Anyone on other medications. If you take prescription drugs or manage a chronic condition, talk to your provider first.

And the universal one: whoever you are, talk to a licensed healthcare provider before starting SS-31. This guide is educational, not a substitute for personalized medical advice.

Where to buy it safely.

This is where a lot of beginners get burned, because peptide quality varies wildly between vendors and the cheapest vial is not always the real deal. With SS-31 this matters even more, because the research-grade material is not made under the oversight the approved drug is. Our honest take: do not shop on price alone, shop on price plus independent lab data.

• Compare vendors side by side. Price ranges are wide, and the difference between the lowest and highest listing can be large for the exact same compound.
• Look for recent third-party lab tests. The gold standard the community looks for is a recent Janoshik certificate of analysis showing purity for the batch you are actually buying.
• Favor recent COAs. An old lab result on a different batch tells you little. The fresher the test, the more it means.
• Be skeptical of suspiciously cheap listings with no testing behind them.

That is exactly the comparison we put together. On our SS-31 product page you can compare vendor prices, see which batches have public lab data, and view the grades we assign from that data. From there you can head to the buy page to line up your options.

Questions, answered straight.