06 | harms people reported
CJC-1295 is an unapproved peptide, pieced together from protein parts.
This page separates study findings, user stories, and FDA concerns from 2024. Long-term safety isn't known.
Which side effects did people report?
Teichman's 2006 paper said people had the fewest problems at 30-60 micrograms for each kilogram a person weighs, the two lowest CJC-1295 amounts tried [1]. Micrograms are tiny; a million make one gram. Healthy adults aged 21-61 took part, over 28- and 49-day stretches. At the higher amounts, 125 and 250 micrograms per kilogram, some people had brief skin reactions where the needle went in [1]. Useful to know. It still says nothing about years of use.
In 2016, Van Hout and Hearne read through women's online posts about CJC-1295. The women described red, swollen or itchy skin, flushing, headache, dizziness, nausea and mild water gain [15]. These are things people using it for research say happened to them; no controlled study has checked them. The posts raise fair questions. They can't say how often any problem happens.
FDA's 2024 paper on CJC-1295 flagged blood vessels widening all through the body [13]. It also worried about immune reactions and harmful impurities, meaning things in a product that shouldn't be there [13]. Category 2 is FDA's list of pharmacy ingredients it has flagged as possibly unsafe while it looks into them. In September 2024, FDA said the peptide had come off that list, because whoever asked for the review withdrew the request [16]. Coming off the list isn't a finding of safety, and it isn't a green light for clinics.
Can the small studies show CJC-1295 is safe?
No. The human record covers only a few weeks of use. In 2006, Teichman reported the fewest problems at the two lowest amounts, 30-60 micrograms for each kilogram a person weighs [1]. That compares the amounts tried against each other over a short time. It doesn't clear the drug for long use. What months or years of use would do, nobody has published. FDA has never approved it to treat any illness [13][16].
FDA's 2024 review listed four worries: immune reactions, harmful impurities, too little testing in people, and blood vessels widening all through the body [13]. The body that polices drugs in world sport also bans it for athletes, during events and between them [10]. A sports ban isn't a safety test, but it matters if you compete.
Why did some people flush after CJC-1295?
Pharmacy papers offer two possible reasons for flushing after an injection just under the skin. One is histamine, a chemical your body lets out during some reactions. The other is blood vessels opening wider [13]. FDA's papers called that widening, when it happens all over the body, a safety concern [13].
Women whose online posts Van Hout reviewed in 2016 often mentioned a flushed face [15]. The warmth and redness usually lasted from a few minutes to an hour. Those posts are too few to show whether bigger amounts brought more flushing. And posts can't settle the cause.
Did the studies find hair loss?
The CJC-1295 studies that compared treated and untreated groups didn't list hair loss [1]. Van Hout's 2016 review turned up a few online posts from people worried about their hair. Their guess was that IGF-1, a liver hormone the peptide raises, might play a part [15]. That guess came from users, not from any test; nobody has checked whether CJC-1295 affects hair. No paper counts anyone who lost hair from it, so there are no odds to give you.
Did people gain water or lose body fat?
Women whose posts Van Hout reviewed in 2016 mentioned mild water gain [15]. That comes from their own accounts, not a trial comparing groups. Teichman's 2006 study wasn't built to look at weight. It tracked growth hormone and IGF-1, the liver's partner hormone, in the blood [1].
The best fat study was on tesamorelin, a different drug, in people with HIV-associated fat build-up deep in the belly. That fat fell an average 15-18% against a placebo, a dummy shot with no drug in it. Mild water gain turned up there too [9]. Different drug, different proof. The result doesn't transfer.
Did the studies find higher testosterone?
CJC-1295 works on growth hormone and IGF-1, the hormone the liver makes in reply. It doesn't touch the glands that make testosterone. Growth hormone and IGF-1 were what the studies measured. Testosterone wasn't what they set out to track, and they reported no clear change in it [1]. In 2017, Sigalos studied men with low testosterone who took several drugs, testosterone among them, and their IGF-1 rose [11]. Their testosterone came from the treatment they were given, not from CJC-1295.
How quickly do blood tests settle after shots stop?
Growth hormone and IGF-1, its partner from the liver, drift back toward where they started as the peptide clears. Half of the long-lasting form takes about 8 days to go, so its effects can hang on one to two weeks after the last shot [1]. IGF-1 may take longer still. The short form is gone within hours, and its effect with it [6]. FDA pointed out the catch: once a drug is tied to albumin in your blood, there's no quick way to take it back out [13].
Which reported CJC-1295 harms need more study?
The study and people's own accounts mention red, swollen or itchy skin at the needle spot, plus flushing, headache, dizziness, brief nausea and mild water gain [1][15]. The personal accounts come from people's own use, not a controlled trial. FDA's 2024 paper added worries about blood vessels widening throughout the body [13], immune reactions, harmful impurities, and the thin long-term record in people [13].
Could CJC-1295 really thin your hair?
Nobody knows. The CJC-1295 trials that compared groups didn't list hair loss [1]. Online writers wondered whether higher IGF-1, a liver hormone, might thin hair [15]. That's a worry passed around by users, not a finding. No paper says how often it happens or whether the compound is to blame.
Can CJC-1295 cause lasting weight gain?
If you've read online that it makes people hold water, that's where it comes from: users have mentioned mild water gain [15]. Nobody has put those reports to a controlled test. Broader growth-hormone studies measured muscle and fat, not just the bathroom scale [9]. Teichman's 2006 study didn't treat weight as a main measure [1]. So whether any weight gain lasts, the evidence can't tell you.