What IGF-1 LR3 is
IGF-1 LR3 is an Insulin-like growth factor analogue. A modified IGF-1 with an arginine substitution and a 13-amino-acid extension, reducing binding to IGF binding proteins and extending its active window relative to native IGF-1.
Class and mechanism
IGF-1 LR3 is an Insulin-like growth factor analogue. A modified IGF-1 with an arginine substitution and a 13-amino-acid extension, reducing binding to IGF binding proteins and extending its active window relative to native IGF-1.
Where it sits
Growth hormone itself and the secretagogues that prompt its release are different things. Somatropin is the hormone. A secretagogue acts on the GHRH or ghrelin receptor to raise the body's own output.
Other names
IGF-1 LR3 is also written as Long R3 IGF-1. The same molecule appears under more than one name, which is worth knowing when comparing listings between suppliers.
Others in the growth hormone and secretagogues range
IGF-1 LR3 sits in the growth hormone and secretagogues group. The compounds below share that grouping, which is the useful starting point when comparing one against another: same group means the comparison is like for like, different group usually means it is not.
| Compound | Class | Listings | From |
|---|---|---|---|
| HGH | Recombinant human growth hormone (191 amino acids) | 6 | £60 |
| Ipamorelin | Growth hormone secretagogue (GHRP) | 3 | £28 |
| CJC-1295 (no DAC) | GHRH analogue | 2 | £33 |
| Tesamorelin | Stabilised GHRH analogue | 2 | £55 |
| HGH Fragment 176-191 | C-terminal fragment of human growth hormone | 1 | £75 |
| GHRP-2 | Growth hormone releasing peptide | 1 | £35 |
Is it held in UK stock?
Stock held in the UK ships domestically, with no customs step. The product page carries live stock rather than a cached figure.
Quanta Pharma IGF-1 LR3 1mgout of stock£40
Availability checked 2026-09-09. The product page carries live stock.