Quick answer: there are no proven peptides for energy. No peptide is FDA-approved to treat fatigue, and the ones marketed for it have either never been tested in people (MOTS-c) or failed to beat placebo on fatigue in a large trial (elamipretide, also called SS-31).[2][5] Low energy usually has a cause a clinician can find and treat, which is a better first step.[1]
This review ranks the peptides most often sold for energy by the human evidence behind them. For related topics, see our longevity peptides hub and peptides for chronic fatigue.
Start with the cause of low energy
Fatigue is among the top 10 reasons people visit primary care.[1] A 2023 review for family doctors sorts it into three types:[1]
- Physiologic fatigue, from too little sleep, poor diet or overexertion, improves with better sleep habits, a healthy diet and balancing activity.
- Secondary fatigue, caused by another condition, improves when that condition is treated.
- Chronic fatigue, including myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). Its hallmark is post-exertional malaise, a crash after effort, and patients are advised to pace their activity rather than push through it.
Because so many causes are treatable, a peptide that masks tiredness could delay finding the real problem. Our guide to peptides for long COVID covers post-viral fatigue.
Peptides for energy, ranked by evidence
| Peptide | Marketed for | Best human evidence | Status |
|---|---|---|---|
| Elamipretide (SS-31) | Mitochondrial energy | Large trial: no fatigue benefit in mitochondrial myopathy[5] | Approved only for Barth syndrome muscle strength[4] |
| MOTS-c | Metabolism, stamina | None in people[2] | Not approved |
| CJC-1295, ipamorelin | Growth hormone, vitality | No energy trials found | Not approved; FDA safety concerns[6] |
| MK-677 | Growth hormone, recovery | Modest results at best; heart failure risk[7] | Not approved |
| Tesamorelin | Belly fat | Approved for HIV-related abdominal fat, not energy[10] | Approved for that use only |
Elamipretide (SS-31): the best-studied, and still not for energy
SS-31, sold as Forzinity, targets cardiolipin, a fat in the inner membrane of mitochondria, the cell’s power plants. It is the only “mitochondrial” peptide with large human trials.
- The fatigue trial: MMPOWER-3 randomly assigned 218 adults with primary mitochondrial myopathy, a genetic muscle-energy disorder, to 40 mg a day under the skin or placebo for 24 weeks. Elamipretide did not improve the 6-minute walk test or total fatigue scores. It was well tolerated.[5]
- The approval: in 2025, FDA granted accelerated approval to improve muscle strength in people with Barth syndrome weighing at least 30 kg, based on knee muscle strength, an intermediate measure. Continued approval may depend on a confirmatory trial.[4]
- Side effects: injection-site reactions are the most common.[4]
If a drug designed to fix faulty mitochondria did not reduce fatigue in people whose mitochondria are genetically impaired, there is little reason to expect it to energize healthy people.
MOTS-c: strong mouse data, no human trials
MOTS-c is a small peptide encoded in mitochondrial DNA. In mice, it improved physical performance in young, middle-aged and old animals. In people, exercise raised MOTS-c levels in muscle and blood, but people were not given MOTS-c.[3] Two of the authors disclosed being consultants and shareholders of a biotech company, CohBar.[3]
FDA’s July 2026 review found no studies in which MOTS-c was given to people, no human pharmacokinetic data and no toxicity studies. In human blood in a test tube, MOTS-c broke down quickly into smaller pieces, and FDA said it is unclear whether an injection reaches active levels.[2] See mitochondrial peptides research for more.
Growth hormone peptides
Peptides that raise growth hormone, such as CJC-1295, ipamorelin and sermorelin, are often promoted for “vitality.” We found no controlled trial showing they raise everyday energy.
- FDA has identified serious adverse events possibly associated with CJC-1295, including increased heart rate and a whole-body vasodilation reaction.[6]
- FDA lists ipamorelin among substances that may pose significant safety risks in compounding by outsourcing facilities.[6]
- A 2026 scoping review found human data on these peptides modest at best, and linked MK-677 to significant risks including congestive heart failure.[7]
- Tesamorelin, an FDA-approved growth-hormone-releasing peptide, is approved only to reduce excess abdominal fat in adults with HIV and lipodystrophy. Its label notes that long-term heart safety has not been established, and energy was not an approved benefit.[10]
GLP-1 drugs can lower energy
GLP-1 medicines are peptides too, but tiredness is a side effect, not a benefit. In Wegovy’s weight-loss trials, 11% of people reported fatigue, compared with 5% on placebo.[8] Our GLP-1 fatigue guide explains why and what helps.
Why people say peptides boost their energy
A 2026 sports medicine review points to the placebo effect, amplified by social media, as one reason people report benefits from unapproved peptides.[9] Expectation, a new routine and changes made at the same time, such as sleeping more or exercising, can all make people feel better.
Safety and legal status
- MOTS-c: FDA staff recommended in July 2026 that it not be allowed in compounding. FDA’s advisory committee voted 7 to 5 in favor, but the vote is not binding, and as of a July 31, 2026 report MOTS-c had not been added.[2][11]
- Unknown products: FDA judged the MOTS-c substances it reviewed “not well-characterized,” with no data on impurities or bacterial contamination, and raised concerns about immune reactions after injection.[2]
- NAD+: often sold beside these peptides for energy, NAD+ is a coenzyme, not a peptide. See our NAD+ profile.
What helps low energy instead
The family-medicine review recommends good sleep habits, a healthy diet and balanced activity for everyday fatigue, and treating the underlying condition when there is one. For fatigue tied to chronic conditions, cognitive behavioral therapy, exercise therapy and acupuncture may help some people, while people with ME/CFS should pace themselves rather than push harder.[1] Sleep problems are a common culprit; see best peptides for sleep for what the evidence says there.
Questions to ask a clinician
- What could be causing my fatigue, and do I need blood tests?
- Could any of my medicines be making me tired?
- Could I have a sleep disorder such as sleep apnea?
- If I am considering a peptide, what human evidence supports it for me?
