IGF-1 LR3 Reference

Plain English

What it is

IGF-1 LR3 is a lab-made, longer-lasting copy of insulin-like growth factor-1 (IGF-1), a natural body signal that tells cells to grow. It was created mainly as a chemical for growing cells in the lab, not as a medicine. The FDA has not approved it, and there is no IGF-1 LR3 medicine a doctor can prescribe.

What people use it for

In fitness and bodybuilding circles, people inject it hoping to build muscle, because it is a slow-release version of a growth signal. None of these uses are approved or proven as treatments.

What the science shows

There is no published human trial program for IGF-1 LR3 itself. Most of what is known comes from animal studies and from how the one approved form of IGF-1 (mecasermin, brand name Increlex, used in children with a rare growth disorder) behaves in the body.

The catch

The World Anti-Doping Agency bans IGF-1 and its analogues in sport at all times, in and out of competition, so athletes face sanctions. IGF-1 pushes sugar out of the blood and into tissues, so it can cause dangerous low blood sugar; the approved IGF-1 medicine warns of severe low blood sugar that can lead to seizures. It is a research chemical, not a treatment.

Reference summary

IGF-1 LR3 was developed primarily as a cell-culture research reagent, not as a human therapeutic. There is no published human clinical program for long-R3 IGF-1 as a research peptide. Community framing extrapolates from recombinant IGF-1 pharmacology.

Regulatory and posture

Categories

Growth Factor

Aliases

Long R3 IGF-1, Long-R3 IGF-1, Recombinant long-R3 IGF-1

Evidence posture

preclinical - WADA-prohibited. No published human clinical program for IGF-1 LR3 as a research peptide. Hypoglycemia, tissue overgrowth, and anti-doping sanction are the principal documented risks.

Regulatory status

No FDA-approved IGF-1 LR3 drug label. IGF-1 LR3 is a modified recombinant IGF-1 analog used in cell-culture research and sold in gray-market research-vial form. WADA prohibits IGF-1 and its analogs under category S2 (peptide hormones, growth factors, related substances, and mimetics) at all times, in and out of competition.

Content review status

research reference

Related tools

• Peptide reconstitution calculator - Convert vial mass and BAC water volume into mcg/ml.
• BAC water calculator - Solve BAC water volume for a target concentration.
• Multi-dose vial calculator - Estimate doses per vial and a projected vial-empty date.
• Reconstituted-vial storage window calculator - Estimate a generic usable-window date and days remaining.
• Peptide half-life calculator - Estimate single-dose decay from cited half-life constants.
• Injection-site rotation overview - Public overview of the Pro site-rotation planner.