IGF-1 LR3
peptideLong R3 IGF-1
Insulin-like growth factor analog
Research status · Not FDA-approved
Not FDA-approved for human use; a research chemical. Prohibited in sport (WADA). Carries meaningful safety concerns (blood sugar, tissue growth).
IGF-1 LR3 is a modified insulin-like growth factor discussed in muscle-growth contexts. It is not approved for human use and carries real safety concerns — this entry exists to inform, not to guide use.
How it works
A long-acting IGF-1 analog that activates IGF-1 receptors involved in tissue growth and glucose handling.
Commonly discussed use cases
- Muscle growth (discussed, unapproved)
Supposed / potential benefits
- Growth-related claims come with significant, poorly-characterized risks
Common side effects
- Low blood sugar (hypoglycemia)
- Injection-site reactions
- Swelling
Warnings & contraindications
- Not FDA-approved; hypoglycemia can be dangerous
- Growth signaling has theoretical risks for existing tumors — a clinician-level discussion
- Banned in sport (WADA); unregulated sourcing risk
Typical timing considerations
No established regimen; any use should be clinician-directed.
Administration route
Subcutaneous injection
Storage
Refrigerate after reconstitution; follow instructions.
Questions to ask your clinician
- Given the hypoglycemia and growth risks, is this appropriate at all?
- What monitoring would you require?
Commonly tracked in Reta
Tracking fields organize user-entered, clinician-directed routines — Reta never recommends or computes doses.
Sources
Track this in Reta
Beta members get a ready-made tracker for IGF-1 LR3 — schedule, dose log, injection-site rotation, reminders, and check-ins — for organizing a clinician-directed routine. Personal tracking is available to everyone during the Public Beta.
Reta is a tracking and education tool — not a medical provider. Nothing here is a diagnosis, treatment, prescription, or dosing recommendation. Peptides and medications should only be used under the direction of a licensed clinician. Talk to a qualified clinician before starting, stopping, combining, or changing anything. Many compounds below are not FDA-approved for human use; some are investigational or sold through unregulated channels where purity and dosing are not guaranteed.