What does DES mean in IGF-1 DES?

It refers to des(1-3), meaning the first three amino acids of IGF-1 are missing. The removed piece is a short sequence called GPE.

Is IGF-1 DES stronger than IGF-1 LR3?

In cell studies, both were more potent than native IGF-1, but they have never been compared in humans. They are thought to differ mainly in how long they last and how far they travel in the body.

Has IGF-1 DES been tested in humans?

No published clinical trials have tested it in people. What is known comes from cell and animal studies.

Does the body make IGF-1 DES naturally?

It appears so. Researchers have reported it in human brain tissue, cow colostrum and pig uterus, though how much the body makes and what it does there are not well understood.

IGF-1 DES Peptide: What It Is, Research and Side Effects

Name: IGF-1 DES: Muscle Growth & Recovery
Uploaded: 2025-06-23T06:47:32-07:00
Duration: 10 min 32 s
Channel: Matthew Farrahi
Description: Matthew walks through what IGF-1 DES is, how it compares with natural IGF-1 and IGF-1 LR3, the research behind it, and its pros and cons.

IGF-1 DES

Also called des(1-3)IGF-1, DES IGF-1, Des-IGF-1

From Matthew Farrahi’s Peptide Insights research · Updated October 28, 2026

IGF-1 DES, also written des(1-3)IGF-1, is a naturally occurring short form of insulin-like growth factor 1 that is missing its first three amino acids. That small change means it barely binds the proteins that normally restrain IGF-1, which made it more potent in lab studies. Research on it comes from cell and animal work, with no human clinical trials.

Type

Shortened form of IGF-1, 67 amino acids

Origin

Found naturally in brain tissue and cow colostrum

Researched for

Muscle cell growth, tissue growth, nerve cells

Evidence so far

Cell and animal studies only; no human trials

For education and research only. Not medical advice, and not a recommendation to use anything.

What is IGF-1 DES?

Natural IGF-1 is a 70-amino-acid hormone made mostly in the liver in response to growth hormone. IGF-1 DES is the same molecule with the first three amino acids (glycine, proline and glutamate) removed, leaving 67. The name des(1-3) simply means those first three positions are missing. Researchers isolated this form in the 1980s from cow colostrum and also found it in human brain tissue and the pig uterus, which suggests it has a natural role in some tissues.

The three amino acids that are cut off form a small piece called GPE, which has been studied on its own in brain research. A drug modeled on GPE, trofinetide, was approved in the US in 2023 for Rett syndrome, but it is a different molecule from IGF-1 DES. Synthetic IGF-1 DES is mostly a lab reagent, and outside labs it is discussed in fitness communities for possible local effects on muscle. Unlike natural IGF-1, it has never been developed as a medicine, and it has not been studied in human trials.

How does IGF-1 DES work?

Like natural IGF-1, IGF-1 DES acts on the IGF-1 receptor, which signals cells to take in glucose and amino acids, build protein and divide. The difference is that the missing amino acids are part of the region that IGF binding proteins latch onto. Without them, IGF-1 DES binds these proteins very weakly, so more of it is free to reach receptors. In cell studies this made it several times more potent than native IGF-1. The same lack of protein binding is thought to mean it is cleared quickly and acts mostly near where it is released.

What has IGF-1 DES research looked at?

Muscle cells: Lab studies in muscle cell lines reported stronger effects on protein building and cell growth than native IGF-1, largely because the cells' own binding proteins do not block it.
Tissue growth in animals: Rat studies compared it with native IGF-1 and reported stronger effects on the growth of some tissues, including the gut.
Brain and nerve cells: Because it occurs naturally in the brain, researchers have studied it and its split-off piece, GPE, for effects on nerve cell survival in lab and animal models.
Human use: There are no published human trials. Claims about muscle growth, fat loss or faster recovery in people are based on anecdote and on IGF-1 biology in general.

IGF-1 DES interests researchers as a natural, locally acting form of IGF-1. The evidence, however, stops at cells and animals. How it behaves in the human body, whether it does anything useful there, and how safe it is in people have not been studied in any controlled way.

IGF-1 DES vs IGF-1 LR3

Both forms avoid the binding proteins that normally limit IGF-1, but they do it differently. IGF-1 DES is shorter than natural IGF-1, is found in the body, and is thought to act briefly and locally. IGF-1 LR3 is longer and entirely lab-made, and while it is often described as longer lasting, rat studies found it was cleared from the blood faster than natural IGF-1. Online sources often quote exact half-lives and potency ratios for both, but these numbers have not been measured in controlled human studies.

IGF-1 DES side effects and cautions

No human studies have measured the side effects of IGF-1 DES, so its risks are inferred from what is known about IGF-1. Online lists of side effects often go well beyond the evidence. The best grounded concerns are low blood sugar, because IGF-1 has insulin-like effects, and the theoretical risk of encouraging abnormal cell growth. Anyone with health questions about it should talk to a qualified clinician.

Low blood sugar: IGF-1 lowers blood sugar, and a more potent form may do so more sharply. People with diabetes, prediabetes or a history of low blood sugar face the most risk.
Cancer history: IGF-1 signaling supports cell growth and division, so active cancer or a history of cancer is a major caution.
Unknown effects: Without human data, effects on the body's own hormone system, long-term safety and safety in pregnancy are unknown.