Compounded in U.S. 503A / 503B pharmaciesThird-party tested — potency, sterility, endotoxinPrescribed only by licensed U.S. providersCold-chain packed · tracked shippingCertificate of Analysis on every lotNo research-use chemicals — prescription onlyCompounded in U.S. 503A / 503B pharmaciesThird-party tested — potency, sterility, endotoxinPrescribed only by licensed U.S. providersCold-chain packed · tracked shippingCertificate of Analysis on every lotNo research-use chemicals — prescription only

IGF-1 LR3

Commonly chosen for: Muscle growth and repair

IGF-1 LR3 product photo from the HealthProsUSA storefront
Product photo from the HealthProsUSA storefront. Packaging may vary by dispensing pharmacy.

What it is

Growth hormone works mostly by triggering IGF-1, and this is IGF-1 itself, modified to stay active far longer than the natural version. It drives muscle cell growth, pushes nutrients into tissue, and speeds repair of damaged muscle. It is considerably stronger than the options above and skips your body's own controls entirely. It needs close monitoring, particularly around blood sugar.

How it works

Growth hormone works mostly by triggering IGF-1 in the liver. This is IGF-1 itself, modified so it stays active far longer than the natural version.

It drives muscle cell growth, pushes nutrients into tissue, and speeds repair of damaged muscle.

It is considerably stronger than the secretagogues and skips your body's own feedback controls entirely, which is exactly why it needs close monitoring — particularly around blood sugar.

Who it's typically for

  • People whose provider has recommended direct IGF-1 support with monitoring.
  • People who have already tried secretagogue options.
  • People willing to have bloodwork tracked while using it.

What to know before starting

Read this part properly

Common side effects

Low blood sugar is the most important one — it can come on quickly. Joint pain, swelling, headache and injection-site reactions are also reported.

Who should avoid it

Not appropriate with active or prior cancer, in pregnancy or breastfeeding, or with poorly controlled diabetes. Because it bypasses your body's normal limits, it is not a starting point for most people.

Consult requirement

A video consult with a licensed provider is required, and monitoring is expected while using it.

This page is educational and is not medical advice. Nothing here is intended to diagnose, treat, cure or prevent any disease. Where you see the FDA-Approved Ingredient mark, the active ingredient is FDA-approved in at least one prescription medication. Products without it are prescribed based on your provider's clinical judgment and current research. Compounded preparations are not FDA-approved products in either case.

Often paired with

Questions people ask

More in Growth Hormone Support

View the category

Ipamorelin

Sleep quality, recovery, lean body composition

Learn more

CJC-1295 / Ipamorelin

The standard growth hormone pairing

Learn more

Tesamorelin

FDA-Approved Ingredient

Deep belly fat

Learn more

Related reading

Ready to begin?

Start through the secure consultation workflow when the intake link becomes active.

Treatment is only available if determined medically appropriate by a licensed provider.

Find My PeptideShop →