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Mitochondria-targeted tetrapeptide · safety
SS-31 side effects
The ss-31 side effects reported most often are injection-site redness, injection-site pain and injection-site hardening. The full list is below, with the FDA label cited at the bottom of the page.
Rarer, but worth being able to spot: serious allergic reactions.
The sources describe these effects in relation to the dose and to the early weeks.
SS-31 is a peptide four amino acids long. It gathers inside mitochondria, the parts of a cell that make energy, and sticks to a fat there. It is sold online for energy, mitochondrial health and slower aging.
The same molecule is an approved medicine for a rare inherited condition, at 40 mg a day under the skin. It was tested for the reason people buy it. In 41 older adults with failing mitochondria, it moved energy production about as much as placebo. The vials sold for that use hold 5 mg, an eighth of one day.
At a glance
Common reactions listed
4
Serious reactions listed
1
Boxed warning
None on label
Strongest source
FDA label
Common reactions
The full list, with the frequency band the FDA label gives for each one.
| Reaction | Frequency |
|---|---|
| Injection-site redness | Every participant on the drug in the 12-person trial, against a quarter of those on placebo |
| Injection-site pain | Three quarters of participants on the drug, against two fifths on placebo |
| Injection-site hardening | Two thirds of participants on the drug, against a sixth on placebo |
| Raised eosinophils, a white blood cell | Frequent; it peaked around 90 days and returned to where it started over 6 to 12 months |
Serious reactions to watch for
These are rarer, and they are the ones clinicians monitor for. Seek medical care if you have symptoms.
| Reaction | Frequency |
|---|---|
| Serious allergic reactions | Serious — monitor. The label describes reactions needing emergency treatment. These have begun from minutes to months after the first dose |
When to seek medical care
Each one below is a serious reaction from the table above, written as the signs you would actually notice. Spotting them is the job of this section; working out what they mean is a clinician’s.
Severe hypersensitivity reaction
Urgent2Read deeper
When these effects tend to occur
The cited evidence describes these effects in relation to the dose and to the early period of taking it, rather than as a constant background throughout.
When a study reports how side effects changed over time, it describes the group as a whole. It cannot predict one person’s experience.
Forzinity side effects
Forzinity is a brand name for ss-31. The frequency bands above describe the molecule. Percentages can still differ by brand because each label may be based on different trials, doses and groups of people.
Common questions
How long do ss-31 side effects last, and do they go away?
The sources do not commit to a set number of days. What they describe is a pattern — reactions cluster after you start and after each increase, then ease while the dose is held steady. Any page quoting an exact number of days is quoting something the sources do not say.
What are the most common ss-31 side effects?
Injection-site redness, injection-site pain, injection-site hardening and raised eosinophils, a white blood cell — the table above has the rest, each with its frequency band and source.
Does ss-31 have a boxed warning?
No — its label carries none. That reflects what regulatory review has and has not covered, not a finding that serious risks were looked for and ruled out.
Can the ss-31 dose be lowered if side effects are hard to tolerate?
That decision belongs to the prescribing clinician. The label sets a single dose rather than a ladder, so there is no step to hold at. Any change to it sits with the prescriber.
Does ss-31 cause hair loss?
Hair loss is not among the reactions listed on this page for ss-31, because the FDA label cited here does not carry it. Anything missing from the tables is outside what can be sourced here rather than ruled out, and a symptom that worries you belongs with a clinician.
Is fatigue a listed ss-31 side effect?
No — the FDA label cited here does not list it. That describes what was reported, not proof that the symptom cannot happen.
Is constipation a listed ss-31 side effect?
Not separately. If a source groups stomach and gut events together, this page keeps that group intact. It does not invent named reactions the source never listed.
What should someone do about a serious ss-31 reaction?
Contact a clinician promptly, and emergency services if symptoms are severe or getting worse quickly. The section above describes what those reactions actually look like, so they can be spotted early rather than explained away.
Do the frequencies on this page mean the chance it happens to one person?
No. These figures describe groups in a study. A band shows how often a reaction appeared under that trial’s conditions. It cannot predict what will happen to one person.
Related
The schedule these reactions were recorded against, the comparisons, and the sourcing rules behind every grade on this page.