IGF-1 LR3

How it works

A longer IGF-1, growth hormone's messenger: 13 extra amino acids so blood proteins barely trap it. Sold as long-acting, for muscle.

What it's made of

83 amino acids: IGF-1 with an arginine at position 3 and 13 extra amino acids at the start. That way the blood proteins that hold back IGF-1 barely trap it.

What it's for

Prescribed for

Nothing.

Sold as

Long-acting IGF-1 to grow muscle.