How does IGF-1 LR3 differ from regular IGF-1?

Native IGF-1 has a very short half-life of ~12 minutes because it is rapidly bound by insulin-like growth factor binding proteins (IGFBPs). LR3 has amino acid substitutions that reduce IGFBP binding affinity by approximately 1000x, extending its active half-life to 20-30 hours and dramatically increasing the time available for receptor signalling.

What is the PI3K/Akt/mTOR pathway and why does it matter for muscle growth?

The PI3K/Akt/mTOR pathway is the primary intracellular signalling cascade responsible for anabolic gene expression. When activated by IGF-1R, it phosphorylates mTORC1, which drives ribosomal biogenesis and protein synthesis - the molecular basis of muscle hypertrophy. IGF-1 LR3 is one of the most potent known activators of this pathway.

What are satellite cells and why does IGF-1 LR3 activate them?

Muscle satellite cells are resident stem cells that sit beneath the basal lamina of muscle fibres. They are normally quiescent but activate in response to mechanical damage or growth signals. IGF-1 LR3 binds IGF-1R on satellite cells, driving them to proliferate and differentiate into new myonuclei - increasing the anabolic capacity of the muscle fibre permanently.

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IGF-1 LR3

Name: IGF-1 LR3
Price: 50 USD
Availability: InStock

Long-acting IGF-1 analogue with 3x longer half-life than native IGF-1, driving satellite cell activation, nitrogen retention, and protein synthesis for maximal

GH BoostMuscle

● In Stock

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Quantity (vials)

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1+ vials

−5%

3+ vials

−10%

5+ vials

−20%

10+ vials

Total Price

$50

For research & laboratory use only. Not for human consumption.

Half-Life

~20-30 hours

Administration Route

Subcutaneous injection

Potent Anabolic Signal

Long R3 analogue with 3x longer half-life than native IGF-1

Hyperplasia Stimulus

Promotes satellite cell division — new muscle fibre formation

Fat Oxidation

Increases glucose uptake in muscle; shifts fuel to fat

Effect Profile

Based on primary research mechanisms

Muscle Growth

Fat Oxidation

Recovery Speed

Strength

Effect Timeline

Start

Muscle fullness increases; satellite cell activation begins

Week 2

Strength gains; muscle repair between sessions accelerated

Week 4

Hyperplasia potential; new fibre formation possible with training

Week 8

Maximum anabolic window; continued training amplifies results

Start — Week 1