Page last checked 2026-08-12

Growth hormone-releasing factor analogue (research compound) · safety

CJC-1295 side effects

Also written CJC 1295 or CJC1295.

The cjc-1295 side effects reported most often are sustained elevation of IGF-I, continuously raised trough growth hormone and mild local and systemic effects of growth-hormone-axis stimulation. The full list is below, with the cited trial report cited at the bottom of the page.

Rarer, but worth being able to spot: serious side effects and unknown long-term risk.

The sources describe these effects in relation to the dose and to the early weeks.

CJC-1295 is a redesigned copy of the hormone that tells your pituitary to release growth hormone. One version bonds to a protein in your blood, which stretches its life from minutes into days. It is sold for the same wishlist as ipamorelin, and usually stacked with it: muscle, fat loss, recovery and sleep.

The human studies measured one thing, and it was growth hormone in the blood. None of them reported muscle, fat, strength or anything a person would notice. Most material sold under the name is the short-acting molecule, which was never in those studies.

Further down: the full list with frequencies · when to get medical help · questions

Medically reviewed by Jennifer Montecillo, MD · non-practicing medical reviewerReviewed 2026-08-12open the primary sources

At a glance

Common reactions listed

Serious reactions listed

Boxed warning

No label exists

Strongest source

limited human data

The counts show how many distinct reactions the cited trial report names. The percentages show how often a reaction appeared in a study group, not the chance that it will happen to you.

Common reactions

The full list, as reported across the available trial evidence. There is no approved label to read frequency bands off, so these are the trials’ own figures.

◆ Common reactionstrial-reported

Reaction	Frequency
Sustained elevation of IGF-I	1.5- to 3-fold above baseline for nine to eleven days after one injection, and above baseline for up to 28 days after repeated doses
Continuously raised trough growth hormone	Basal growth hormone rose 7.5-fold a week after a single dose — a different physiological state from the pulses the body produces on its own
Mild local and systemic effects of growth-hormone-axis stimulation	Named in the review literature; no incidence figure has been published for them

Serious reactions to watch for

These are rarer, and they are the ones clinicians monitor for. Seek medical care if you have symptoms.

◆ Serious — monitorwarning/precaution

Reaction	Frequency
Serious side effects	None reported across the two ascending-dose trials, which ran 28 and 49 days — an absence over seven weeks, not a safety record
Unknown long-term risk	No long-term safety data exists, and no controlled efficacy trial was ever completed — monitor

limited human dataEvery reaction above comes from a cited trial. These are study findings, not instructions on what to take.

When to seek medical care

The trial report does not give a separate list of serious reactions. There is also no approved label. That gap does not mean serious reactions cannot happen. This compound has been studied in fewer people and for less time than an approved drug.

EmergencySome symptoms should not wait for an appointment. Call emergency services (911 in the US) if they are severe, getting worse fast, or involve trouble breathing, chest pain, fainting or confusion.

1Read deeperTiming, evidence limits, and product context

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.

Common questions

How long do cjc-1295 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 cjc-1295 side effects?

Sustained elevation of IGF-I, continuously raised trough growth hormone and mild local and systemic effects of growth-hormone-axis stimulation — the table above has the rest, each with its frequency band and source.

Does cjc-1295 have a boxed warning?

No, because a boxed warning is part of an FDA-approved label and cjc-1295 has no approved label. That reflects what regulatory review has and has not covered, not a finding that serious risks were looked for and ruled out.

Can the cjc-1295 dose be lowered if side effects are hard to tolerate?

That decision belongs to the prescribing clinician. No approved schedule exists for this compound, so there is no labeled framework for adjusting a dose. That leaves the prescriber as the only place the decision can sit.

Does cjc-1295 cause hair loss?

Hair loss is not among the reactions listed on this page for cjc-1295, because the cited trial report 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 cjc-1295 side effect?

No — the cited trial report cited here does not list it. That describes what was reported, not proof that the symptom cannot happen.

Is constipation a listed cjc-1295 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 cjc-1295 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.

The schedule these reactions were recorded against, the comparisons, and the sourcing rules behind every grade on this page.

CJC-1295 without an approved label: what exists instead

No published half-life figure was found for CJC-1295.

What a studied CJC-1295 figure is, and what it is not

Published CJC-1295 dose information, not a personal schedule to follow.

The CJC-1295 half of tesamorelin vs cjc-1295

Each page in tesamorelin vs cjc-1295 on its own terms, rather than folded into CJC-1295.

Work out the CJC-1295 draw in syringe units

Vial sizes 5 mg for CJC-1295, each with its own concentration.

The generic calculator behind the CJC-1295 one

Vial strength and water volume in and the exact mark out, with CJC-1295 as context

CJC-1295 in the regulatory changelog

A proceeding with no published outcome is entered as exactly that, including CJC-1295

All the pages CJC-1295 is compared with

The spine every dosing, safety and calculator page reads from, including CJC-1295

Why some CJC-1295 values are missing on purpose

An absent value means no source carries one, including CJC-1295

Questions readers ask

Is the CJC-1295 safe?

Nobody can say, because the trials that would answer it lasted seven weeks at most. No serious side effect turned up in either one. An absence across twenty-eight and forty-nine days is not a safety record.

The page also carries a flag for unknown long-term risk. No controlled trial of what it achieves ever finished, so nobody has watched people on it for months or years.

Does CJC affect testosterone?

Nothing in the safety record touches testosterone. The two trials tracked growth hormone, IGF-I and side effects; sex hormones were never on the sheet. Nobody looked, so nobody found anything.

What the trials did record runs elsewhere. IGF-I stayed above baseline for up to twenty-eight days after repeated doses. Resting growth hormone sat seven and a half times higher a week after a single dose.

What are the negative side effects of peptides?

It depends on the peptide, and for this one the list is short because the looking was short. Both trials reported no serious events. Review literature names mild local and general effects of stirring the growth-hormone axis, without a rate for any of them.

There is a second answer worth having. A peptide with no approved label carries no documented interaction list, no monitoring plan and no route for reports to reach a regulator. Silence from a system nobody built is not reassurance.

What do you feel after taking CJC-1295?

No trial recorded what participants felt. The two human studies drew blood and measured hormones; neither published a symptom diary. So the evidence gives no answer.

What the blood does show is a state the body does not normally hold — growth hormone raised steadily, where the body makes pulses. Whether that produces any sensation nobody has measured.

3primary sources, each with the day we read it — open the documents used on this page