RESEARCH USE ONLY. Reference data for laboratory research. Not medical advice; not for human consumption.
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IGF-1 LR3
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Protocol01
IGF-1 LR3

Growth Hormone

Vials · 1 mg

01Protocol

Vials
1 mg
Dosing data
Lab reference — not listed

02Quick calculator

Draw (100u)

—

Concentration

—

mg/mL

03Mechanism of action

IGF-1 LR3 (Long R3 IGF-I) is a recombinant IGF-1 analogue with an extra 13-amino-acid N-terminal extension and an arginine substitution, which reduces binding to IGF-binding proteins and prolongs activity. It is widely used in cell culture.

04Study endpoints

  • Recombinant LR3 IGF-1 produced in yeast showed bioactivity comparable to standard IGF-1.
  • Anti-doping analysis of a black-market product identified His-tagged Long R3 IGF-I, a form whose effects in humans have not been described.

05Safety & regulatory findings

  • Not approved by the FDA or EMA for any indication; research-grade material is not a medicine.
  • Listed as prohibited in sport by the World Anti-Doping Agency.
  • No human clinical trials of LR3 are cited; black-market products may contain unexpected variants.

06Citations

2 references · view