What happened when people took it?
CJC-1295 raised two blood readings for days
Small studies found more growth hormone and IGF-1, a growth-related blood reading. They didn't show that anyone felt or lived better.
CJC-1295 changed blood tests, not daily life
In one small study, healthy adults received a CJC-1295 shot under the skin. Growth hormone rose 2- to 10-fold and was still high six days later. IGF-1, a growth-related blood reading, rose 1.5- to 3-fold during a nine-to-eleven-day span. After an estimated 5.8 to 8.1 days, half of the drug was still in the body [1].
Those CJC-1295 findings drew notice, but the study had a narrow aim. The study didn't tell us whether anyone got better sleep, quicker healing, or less fat. The drug is also barred in tested sport. That matters when you're judging a hopeful claim.
CJC-1295 copies part of a hormone made inside you [2]. A small gland near the brain responds by releasing growth hormone. Scientists changed four of the drug's first 29 building blocks so blood would clear it more slowly. The attached form adds a part that fastens to albumin, a protein carried in blood [2].
The short CJC-1295 form is often called no-DAC, meaning it doesn't carry the albumin link. It leaves after minutes or a few hours because it can't fasten to albumin. The long form doesn't leave for days. If a claim doesn't name the form, you can't judge its timing.
In 2005, the rats made four times the total amount of growth hormone over time with the attached form [2]. In 2006, people continued their normal rises and falls of growth hormone while CJC-1295 stayed for days [1][3]. In 2009, one blood protein rose with the growth reading, which could help confirm that the drug acted [5]. None of that tells you what a person would feel.
In 2010, a lab found CJC-1295 in a black-market vial [6]. In 2025, a review described this drug family and the tests used in sport [11]. The history may help you, yet it can't settle long-term safety. I'd keep that blank space in mind if this were my choice.
The FDA hasn't approved CJC-1295 for use in people. Tested sports bar it at all times [4]. You can read the human and animal studies, compare the two forms, and review the possible harms. The CJC-1295 source list and reports from users show where each claim came from.
CJC-1295 tells a gland to release growth hormone
CJC-1295 is made to copy part of a hormone in your body. Scientists changed four of its building blocks. Those changes keep blood from breaking it down too fast [2]. No drug agency has approved it as medicine for people.
The attached form adds a part that grips albumin, a protein in blood. This bond keeps the drug in the body for days. The shorter kind doesn't have that added part and leaves far sooner. Whatever sellers call them, you aren't looking at approved medicine.
The drug acts on your pituitary, the small growth gland near the brain. In response, that gland releases growth hormone [2]. Your liver then makes IGF-1, another growth-related reading. Your doctor can measure both hormones with a blood test.
The changed building blocks are numbered 2, 8, 15 and 27 [2]. All four help the drug withstand the body's usual cleanup. In plain terms, this made-in-a-lab drug outlasts the hormone it copies. That's the point to keep clear.
CJC-1295 raised growth hormone in small studies
CJC-1295 asks the growth gland for growth hormone. Next, the liver raises IGF-1, another growth-related blood reading. Healthy adults received 30-60 micrograms per kilogram, and both readings stayed high for days [1]. IGF-1 rose 1.5- to 3-fold, but the study didn't test daily life.
One million micrograms make a gram, so these were tiny amounts. Researchers adjusted each amount for the adult's body weight. Those figures record a study; they don't set your dose. Those readings don't say whether anyone felt better.
Healthy young men received one 60 or 90 microgram shot per kilogram. At the one-week check, their resting growth hormone was about 7.5-fold higher [3]. You can see that the usual rises and falls kept their timing and size. The study page gives you each result and its limit.
Long-term safety has not been settled
The CJC-1295 studies in people were small and brief. After a shot, healthy adults had higher growth hormone and IGF-1, a growth-related reading [12]. The studies can't tell you whether long use is safe. They also didn't ask whether people felt better in daily life.
A Phase 2 study—an early test in people meant to look for benefit and watch safety—gave the long form to people with fat deep in the belly from HIV-associated illness. The study stopped, and work on the drug didn't go forward [12]. The public report gives no firm long-term answer. That missing answer bears on your choice.
Here is the part to carry away. More than one test confirmed short-term changes in blood. You don't have proof of lasting safety or a benefit people noticed. The possible side effects and plain answers lay out those two limits.