Educational information only. Not medical advice. Talk to a qualified healthcare professional before using any compound. Disclaimer

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IGF-1 LR3

Growth Hormone & Muscle

IGF-1 LR3

Also known as Long R3 IGF-1, LR3-IGF-1

Animal or no human dataNot approvedWADA prohibited

Price range: €25 through €71

Discussed for: Muscle growth, recovery.

Sequence: not listed. Modified or non-standard residues are left out on purpose.

Effect strengthHow hard it acts on the body8/10
Proof levelHow well that is shown in humans1/10
Risk levelHow much can go wrong9/10

Editorial 1 to 10 estimates from published research, not measured values. How to read these

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01 / Identity

What it is

IGF-1 LR3 is a modified growth factor (83 aa). Main reported uses: muscle growth, recovery. Current status: not approved.

Molecule type
Modified growth factor (83 aa)
How it is taken
Injection (SC/IM)
Other names
Long R3 IGF-1, LR3-IGF-1

Route only. This library does not publish doses or protocols.

02 / Mechanism

How it is thought to work

Long-acting modified IGF-1 that directly drives muscle growth and lowers blood sugar

Mechanisms seen in cells or animals do not always happen the same way in people.

03 / Potential benefits

What people use it for

Muscle growth, recovery

Animal or no human data

No meaningful human data. Effects and safety in people are unknown, which is not the same as safe.

Listed uses are what people use it for, not proven outcomes.

04 / Known risks

Side effects and risks

Low blood sugar (can be dangerous), organ growth, theoretical cancer-growth risk

Risk level 9 of 10

High risk score: serious harms are documented or plausible, and there is little data to rule them out.

Unknown long-term effects count as a risk, not as a clean record.

05 / Regulatory

Regulatory status

Status
Not approved
Details
Not approved
Sport (WADA)
Yes: S2 (peptide hormones / GH factors)

Status reflects information up to mid-2026 and changes over time. Check current sources.

06 / Evidence quality

How good is the evidence?

None in humans

How we grade evidence

07 / Notes and sources

Notes and sources

  • Growth-factor peptides carry a theoretical risk of feeding existing cancers.
  • Animal only means effects and safety in humans are unknown, not that they are proven safe.
  • Products sold online as research peptides are unregulated. Tests of such products often find wrong amounts, impurities or a different compound.
  • Anyone using compounds like this regularly should have medical supervision and bloodwork (for example IGF-1, glucose and HbA1c, hormones, lipids).
  • Source: Peptide Reference Table, an editorial review of published research up to mid-2026. Scores are 1 to 10 editorial estimates, not measured values. Regulatory and WADA status change over time.

Educational information only. Not medical advice. Talk to a qualified healthcare professional before using any compound.

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