What Is IGF-1 LR3?

Native IGF-1 contains 70 amino acids. IGF-1 LR3 contains 83. Chemists made two changes: they replaced glutamic acid with arginine at position 3, which explains the R3, and they added a 13 amino acid extension to the front of the chain, which explains the L for long. Together, those edits cut the peptide’s affinity for IGF binding proteins and stretch its half life to roughly 20 to 30 hours, compared with 12 to 15 hours for native IGF-1.

Why Binding Proteins Matter

Native IGF-1 circulates almost entirely bound to proteins, mostly IGFBP-3, which limit how much of it reaches tissue. IGF-1 LR3 slips past that gatekeeping. As a result, researchers describe it as about three times more potent than IGF-1 in cell assays, and tiny microgram amounts produce measurable activity.

Receptor Grade and Cell Culture Use

You may see the phrase receptor grade IGF-1 LR3. It reflects the peptide’s best established role: scientists add it to serum free cell culture media to support cell growth in laboratories and biomanufacturing. That use involves cells in dishes, not people, and it explains why suppliers label the product for research only.

IGF-1 LR3 For Sale: Choose Your Format

Each vial ships with an HPLC chromatogram, an identity result, and a handling guide.

IGF-1 LR3 1mg Vial

The 1mg vial serves as the standard research format. Because working amounts stay in the microgram range, one vial supports a long series of small aliquots.

Contents: IGF-1 LR3 1mg
Purity: 98 percent minimum, HPLC verified, third party tested
Includes: reconstitution guide, storage card, COA
Delivery: 1 to 2 business days, discreet packaging, full tracking

IGF-1 LR3 0.1mg Vial

The 0.1mg vial fits small scale and cell culture studies. It reduces waste for teams that need only a minimal quantity.

Contents: IGF-1 LR3 0.1mg
Purity: 98 percent minimum, HPLC verified, third party tested
Includes: reconstitution guide, storage card, COA
Delivery: 1 to 2 business days, discreet packaging, full tracking

Best IGF-1 LR3 Suppliers: A Checklist That Works

Anyone searching for the best IGF-1 LR3 suppliers faces a real problem. This protein is large and fragile, so it degrades easily, and low quality batches often contain truncated or inactive material. Therefore, test every vendor against the checklist below, including us.

What to verify	Peptide Near Me	Typical marketplace seller
Full 83 amino acid LR3 stated clearly	Yes	Often vague
Mass spectrometry confirms molecular weight	Yes	Almost never
HPLC purity result per lot	Yes	Sometimes
Lot number matches the vial	Yes	Rarely
Cold chain handling in transit	Yes	Inconsistent
Research use only labeling	Yes	Inconsistent

Mass spectrometry carries special weight for this compound. IGF-1 LR3 is far larger than short peptides, so an identity test quickly reveals whether a vendor shipped native IGF-1, a shorter analog, or something else entirely. Questions? Contact our team.

IGF-1 LR3 vs IGF-1 DES: Which Fits a Study?

IGF-1 DES, also written DES 1-3, lacks the first three amino acids of native IGF-1. Like LR3, it escapes binding proteins, but it behaves in the opposite way over time.

	IGF-1 LR3	IGF-1 DES
Length	83 amino acids	67 amino acids
Half life	About 20 to 30 hours	Very short, minutes
Potency	About 3 times native IGF-1	Higher locally
Action pattern	Systemic and sustained	Brief and local
Hypoglycemia risk	High, long lasting	Present, shorter

Researchers who want a sustained systemic signal choose LR3. Those who want a short, localized burst choose DES. Neither has human clinical trials behind it.

Tesamorelin vs IGF-1 LR3

These two compounds sit at different points in the same axis. Tesamorelin mimics growth hormone releasing hormone, so it prompts the pituitary to release growth hormone, and the liver then makes IGF-1. IGF-1 LR3 skips that chain and activates the IGF-1 receptor directly.

	Tesamorelin	IGF-1 LR3
Level of action	Pituitary, upstream	IGF-1 receptor, downstream
Feedback loops	Preserved	Bypassed
FDA status	Approved, narrow indication	Not approved
Hypoglycemia risk	Low	High
Human trial depth	Large trials	None

Because tesamorelin works upstream, the body keeps its normal feedback controls. IGF-1 LR3 removes them, which explains both its potency and its added risk. Compare options on our CJC 1295 and ipamorelin page and in the Sleep and Growth Hormone category.

IGF-1 LR3 Dosage: What Is Known and What Is Not

Let us be direct. No regulator has approved a dose, and no human clinical trial exists for this analog. The closest human reference comes from mecasermin, a version of native IGF-1 that the FDA approved for severe primary IGF-1 deficiency in children and that doctors dose under tight supervision because of hypoglycemia.

Context	Reported figure
Preclinical animal models	50 to 150 mcg per administration
Community reports	20 to 100 mcg per day
Human dose	No established dose exists
Typical course in community reports	4 to 6 weeks on, then an equal break

Treat those numbers strictly as background, not as a recommendation. Because the half life runs 20 to 30 hours, effects overlap from one day to the next. Consequently, mistakes accumulate faster than with short acting peptides.

IGF-1 LR3 Dosage Calculator and the IU Question

Searches for IGF-1 LR3 dosage in IU confuse two different units. IGF-1 LR3 is measured in micrograms, not international units. The IU people refer to are syringe units, where 100 units equal 1 mL on a standard insulin syringe. This example shows the math with a 1mg vial.

Water added	Concentration	Micrograms per syringe unit
1 mL	1,000 mcg per mL	10 mcg
2 mL	500 mcg per mL	5 mcg
5 mL	200 mcg per mL	2 mcg

At 1 mL of water, a 20 mcg amount would measure 2 units. Because this peptide needs a particular diluent and sticks to plastic, follow the diluent instructions in the handling guide, and double check every calculation.

IGF-1 LR3 Side Effects and Safety: Read This First

Safety deserves more space here than anywhere else on our site. The main danger is hypoglycemia. IGF-1 LR3 mimics insulin’s effect on glucose uptake, so blood sugar can fall sharply, and with a 20 to 30 hour half life, the drop can last a long time. Symptoms include shakiness, sweating, confusion, hunger, and in severe cases seizures or loss of consciousness.

Other Reported Effects

Researchers also report water retention, joint stiffness, muscle soreness, and injection site reactions. Moreover, IGF-1 signaling promotes cell growth in many tissues, and epidemiological work links higher IGF-1 levels with higher cancer risk. Animal work raises the possibility of organ enlargement with sustained exposure. Nobody has measured these outcomes for LR3 in people.

Who Should Not Use It

People with diabetes, a cancer history, any undiagnosed growth, or a pregnancy should avoid it. Anyone taking insulin or glucose lowering medication faces added danger. Competitive athletes also risk a violation, since WADA prohibits IGF-1 and its analogs at all times. If you ever suspect severe low blood sugar, seek emergency care immediately.

IGF-1 LR3 Before and After: Why Photos Mislead

Searches for IGF-1 LR3 before and after and IGF-1 LR3 results return plenty of photos. Unfortunately, those images prove little. Lighting, training, diet, water retention, and posture all change a physique, and none of the photos come from controlled studies. In fact, no randomized trial has measured body composition outcomes with this compound. We make no promises about appearance or performance.

Can You Stack IGF-1 LR3 With Other Peptides?

Online threads discuss combining IGF-1 LR3 with CJC 1295 and ipamorelin or with tissue repair peptides like BPC-157. No study has tested those combinations. Additionally, stacking a growth hormone secretagogue with a direct IGF-1 receptor agonist raises the same hypoglycemia and growth signaling concerns at once. Therefore, we cannot recommend any combination, and we encourage researchers to consult a physician and their institution first.

IGF-1 LR3 Price: What You Pay for Quality

Prices vary widely because purity varies widely. A suspiciously cheap vial often hides low purity, truncated protein, or too little active material. When you compare IGF-1 LR3 price quotes, calculate the cost per verified microgram, not per vial, and demand a lot matched COA for each one.

Regulatory Status in 2026

The FDA has not approved IGF-1 LR3 for any use, and it does not appear on the 503A bulk substances list, so no recognized compounding pathway exists. WADA prohibits it at all times. We sell it only as a research compound, not for human or veterinary use and not as a supplement. Check the FDA compounding page and the literature on PubMed before you order.

Ready to Order IGF-1 LR3?

You now understand how the peptide works, how it differs from IGF-1 DES and tesamorelin, and why safety demands respect. One decision remains, and it controls what arrives at your door: the source. Every vial we ship carries a lot matched COA, and we confirm identity by mass spectrometry before any batch enters inventory. Orders placed before 2pm ship the same day, and a real team member answers every message.

Add the 1mg vial to your cart. Add the 0.1mg vial to your cart. Ask us a question first.

Discreet outer packaging. Cold chain handling. Full tracking from dispatch. Delivery to all 50 states.

Exploring more options? Visit the Recovery and Repair category or the Weight and Metabolism category.

Frequently Asked Questions About IGF-1 LR3

What is IGF-1 LR3?

IGF-1 LR3 is an 83 amino acid analog of IGF-1 with reduced binding to IGF binding proteins and a half life of about 20 to 30 hours.

Where can I find IGF-1 LR3 for sale?

You can order it from our store as a research compound. Wherever you shop, confirm that the seller publishes a lot matched COA and a mass spectrometry identity result.

What is the difference between IGF-1 LR3 and IGF-1 DES?

LR3 is longer and acts for about a day. DES is shorter and acts for minutes, mostly locally.

What is the usual IGF-1 LR3 dosage?

No standard exists. Community reports describe 20 to 100 mcg per day, but no human trial supports any number, and hypoglycemia risk makes guessing dangerous.

Is IGF-1 LR3 dosed in IU?

No. It is measured in micrograms. The IU people mention usually refers to syringe units on an insulin syringe.

What are the main side effects?

Hypoglycemia is the biggest risk and can last many hours. Researchers also report water retention, joint stiffness, and injection site reactions.

How does IGF-1 LR3 compare with tesamorelin?

Tesamorelin works upstream by prompting growth hormone release and holds FDA approval for a narrow indication. IGF-1 LR3 acts directly on the IGF-1 receptor and has no approval.

Is IGF-1 LR3 the same as growth hormone?

No. Growth hormone triggers IGF-1 production in the liver. IGF-1 LR3 is a modified form of that downstream molecule.

Is IGF-1 LR3 legal in the US?

Retailers sell it for research use only. The FDA has not approved it, and it has no recognized compounding pathway.

Can athletes use IGF-1 LR3?

No. WADA prohibits IGF-1 and its analogs at all times.