Urolithin A vs Elamipretide (SS-31): What's the Difference?

Urolithin A and elamipretide are both described as "mitochondrial," so they get mentioned in the same breath. In reality they live in completely different categories: one is an oral dietary supplement for general healthy-aging support, the other is a prescription injectable drug for an ultra-rare genetic disease. Here is the honest, side-by-side explanation.

If you have been reading about mitochondrial health, you have probably run into both names. Elamipretide, also known by its research code SS-31, is one of the most studied mitochondria-targeted compounds in medicine. Urolithin A is the postbiotic that SOMA HEALTH builds its gummies around. People sometimes ask which is "better," but that question misunderstands what each one is for. This page walks through how they work, who they are intended for, and why they are not interchangeable.

Two different mechanisms, both at the mitochondria

The mitochondria are the cell's power plants, turning nutrients and oxygen into ATP, the energy currency of every muscle contraction and nerve impulse. Both compounds act there, but on different problems.

How elamipretide (SS-31) works

Elamipretide is a small synthetic peptide, a Szeto-Schiller tetrapeptide, that is drawn to the inner membrane of the mitochondrion. There it binds a unique fat called cardiolipin, which is concentrated in the folds, or cristae, where the electron transport chain is assembled. You can read more about this molecule in our explainer on cardiolipin. When cardiolipin is damaged or disorganized, the electron transport chain leaks and ATP production falls. By stabilizing cardiolipin and the architecture of the cristae, elamipretide is thought to help the electron transport chain run more cleanly, supporting ATP output and reducing the excess reactive oxygen species that come from a leaky chain. In short, it works on the structural integrity of the energy-producing membrane itself.

How urolithin A works

Urolithin A takes a different route. Rather than repairing the membrane of existing mitochondria, it is studied for its ability to stimulate mitophagy, the quality-control process by which cells identify worn-out mitochondria and recycle them, a specialized form of autophagy. The idea is to keep the overall mitochondrial pool efficient by clearing the damaged units so healthier ones can do the work. Urolithin A is a compound your gut bacteria can produce from ellagitannins in pomegranates, walnuts, and berries, though many people do not host the microbes to make useful amounts, which is why it is taken as a supplement. Our urolithin A guide covers the full background.

The biggest difference: a supplement versus a prescription drug

This is the distinction that matters most, and it is easy to miss. Urolithin A is a dietary supplement. You take it by mouth, it is available without a prescription, and the human research has largely been in generally healthy and aging adults looking at muscle and cellular energy.

Elamipretide is a pharmaceutical drug. It is given by subcutaneous injection and has been developed to treat specific, serious medical conditions, not for general wellness. In 2025, elamipretide received accelerated approval from the U.S. Food and Drug Administration, marketed as Forzinity, as the first treatment for Barth syndrome, an ultra-rare and life-limiting genetic disease that affects very few people. That approval is a genuine milestone, but it is narrow: it is for a rare disease population under medical supervision, not an endorsement of the peptide as an anti-aging or performance product.

Elamipretide has also been tested in other settings, including primary mitochondrial myopathy, heart failure, and the eye condition dry age-related macular degeneration. Results across those programs have been mixed; a late-stage trial in primary mitochondrial myopathy did not meet its primary endpoints, for example. The broader point is that elamipretide is a serious clinical compound whose evidence is tied to specific diseases, and it is not something to self-source or inject for general healthy-aging goals.

What the human evidence looks like for each

For urolithin A, several human trials anchor the picture. The first-in-human study by Andreux and colleagues in 2019 (Nature Metabolism) found it safe and well tolerated up to 1,000 mg per day and showed a mitochondrial gene-expression signature in muscle. Singh and colleagues in 2022 (Cell Reports Medicine) reported improvements in muscle strength and exercise performance in middle-aged adults over four months at 500 and 1,000 mg. Liu and D'Amico in 2022 (JAMA Network Open) found muscle endurance benefits in older adults. A 2025 randomized placebo-controlled trial (Nature Aging) over about 28 days supported immune-cell mitochondrial health in midlife adults, and a 2024 systematic review in Ageing Research Reviews summarized the field.

For elamipretide, the human evidence sits in the clinical-trial and regulatory world rather than the consumer-supplement world. Its data come from disease-specific studies in rare and serious conditions, culminating in the Barth syndrome approval. Much of the foundational mitochondrial mechanism work on the peptide is preclinical (animal and cell models). The two compounds are, in effect, being evaluated for different purposes by different standards.

So which should you consider?

For a healthy adult interested in supporting muscle, cellular energy, and healthy aging, elamipretide is simply not an option you choose off a shelf. It is a prescription drug for defined medical conditions, and decisions about it belong with a physician in the context of an actual diagnosis. Urolithin A occupies the opposite space: an oral, non-prescription supplement with human evidence in general and aging adults, suited to a daily routine.

If your interest is general healthy-aging and muscle support, urolithin A is the category that fits. If you are curious how it stacks up against other mitochondria-focused options people actually compare, our pages on urolithin A vs MitoQ and urolithin A vs CoQ10 look at supplement-to-supplement comparisons. For a practical starting point, the best urolithin A gummies overview covers forms and dosing.

None of this is medical advice, and neither compound is a cure for anything. Elamipretide in particular should only ever be used under the care of a qualified physician for an approved indication. If you have a mitochondrial disorder or any serious health condition, that conversation belongs with your doctor, not a supplement label.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This guide is educational and is not a substitute for advice from a qualified healthcare provider.