IGF-1 LR3: status and safety
Medically reviewed by the Rite Aid Health Team
Long-acting modified IGF-1 analog used in research. It is prohibited in competitive sport.
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What it is
- IGF-1 LR3 is engineered to reduce binding-protein interaction and extend activity compared with native IGF-1.
- It is marketed for growth and body-composition claims despite limited legitimate clinical use.
- It is distinct from approved recombinant IGF-1 replacement therapy.
For comparison, mecasermin (Increlex) is the FDA-approved recombinant human IGF-1 product used for severe primary IGF-1 deficiency. IGF-1 LR3 is a modified research analog and should not be treated as interchangeable with that approved medication.
Safety and evidence
Potential concerns include hypoglycemia, abnormal tissue growth signals, edema, and unknown cancer-related risk in unsupervised use.
For research-only compounds, the key issue is not just whether a mechanism sounds plausible. Identity, purity, sterility, dose accuracy, route, and human safety data all matter, and vendor vials are not equivalent to FDA-approved medications.
Regulatory status
Not FDA-approved. Banned in sport; research-only products are not approved for human use.
If a compound has an FDA-approved product or a legitimate clinical-trial pathway, that status applies to that regulated product or study. It does not validate research-only products sold for self-use. Research-only products are not approved for human use.
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11 worksheets for vials, schedules, labs, storage, and more.
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Useful before or after you start
- Before you start, compare the details that matter and build a focused question list.
- Already using peptides? Keep vials, administration, sites, wellness notes, labs, storage, and travel together.
- Separate your schedule from what actually happened, so important dates are easier to spot.
- Keep your private working copy on your own device.
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Sources to check
Banned in competitive sport. This peptide is prohibited by the World Anti-Doping Agency (WADA), and athletes subject to drug testing can face sanctions for using it. Check current WADA and league rules before considering it.
For general education only — not medical advice or a treatment recommendation. Peptides are not a substitute for care from a licensed provider. Talk to a qualified healthcare professional before you start, stop, or change any peptide, medication, or supplement.
FAQ
No. It is not FDA-approved as a peptide therapy. Products sold for research use are not approved for human use.
No. Rite Aid does not recommend dosing, stacking, or self-experimentation.