IGF-1 LR3

A long-acting growth factor analogue with real risks and a long half-life.

What it is

IGF-1 LR3 is a modified version of insulin-like growth factor 1, altered so it avoids the binding proteins that normally limit how long it stays active.

How it works

IGF-1 is the downstream messenger of growth hormone. The LR3 modification extends activity from minutes to many hours, which raises both the effect and the risk.

What it is researched for

• Muscle cell growth
• Nutrient partitioning
• Recovery in research settings

Research status

Not approved. Banned in tested sport. One of the higher risk compounds in circulation.

What to watch for

• Hypoglycaemia, which can be serious
• Theoretical risk of promoting existing tumour growth
• Suppression of natural growth hormone output
• Not appropriate for beginners under any reading of the research

Storage

Refrigerate. Reconstitute with the diluent specified by the supplier, not plain water.

Common questions

Why is this listed as advanced?

It affects blood sugar directly, lasts a full day per dose, and has a genuine theoretical cancer concern. The margin for error is small.

Does it need to be injected into a specific muscle?

Site-specific injection is a popular claim with weak evidence. Published work supports systemic rather than local effects.

Educational reference only, not medical advice.