How muscle-growth research peptides work
Most peptides researched in this space fall into one of two groups: growth hormone secretagogues, which are studied for their effect on the body’s own growth hormone release, and repair peptides, which are studied in connection with tissue recovery rather than growth hormone signalling directly. IGF-1 LR3 sits slightly apart — it’s a modified form of insulin-like growth factor 1, studied for its role downstream of growth hormone activity.
None of these are approved medicines. They’re supplied for research purposes only, not for human consumption, and none of the mechanism-level information below is a recommendation for use.
Are they legal to buy in the UK?
These peptides aren’t classified as controlled substances in the UK, but they’re not licensed medicines either — which is why they’re sold strictly for research use.
Compounds compared
| Peptide | Category | Commonly researched for | Product page |
|---|---|---|---|
| CJC-1295 / Ipamorelin | GH secretagogue | Growth hormone release research | View → |
| Sermorelin | GH secretagogue | Growth hormone release research | View → |
| GHRP-2 | GH secretagogue | Growth hormone release research | View → |
| GHRP-6 | GH secretagogue | Growth hormone release research | View → |
| Tesamorelin | GH secretagogue | Growth hormone / fat metabolism research | View → |
| IGF-1 LR3 | Growth factor analogue | Cell growth signalling research | View → |
| HGH (Human Growth Hormone) | Growth hormone | Growth hormone research | View → |
| BPC-157 | Repair peptide | Tissue repair research | View → |
| TB-500 | Repair peptide | Recovery research | View → |
Reflects current catalogue categorisation — update as you add or discontinue products.
What to look for in a supplier
- Batch-specific testing. A Certificate of Analysis tied to the batch you’re actually buying.
- No dosing or cycle guidance. A legitimate research supplier sells the compound, not a usage protocol.
- Clear labelling. Peptide name, concentration, and research-only status stated plainly.
- Transparent storage information for the product itself, not instructions framed around personal use.
- A real returns/guarantee policy with terms you can actually read.
Which category fits which research focus
Growth hormone release research
Growth factor signalling research
Recovery research (supportive, not growth-signalling)
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Every peptide on uksarms.shop ships with batch documentation.
Shop All PeptidesFAQ
What’s the difference between a GH secretagogue and IGF-1 LR3?
GH secretagogues (like CJC-1295, Ipamorelin, Sermorelin, and the GHRPs) are studied for their effect on the body’s own growth hormone release. IGF-1 LR3 is a modified growth factor studied for its role downstream of growth hormone activity, rather than triggering GH release itself.
Are these peptides legal to buy in the UK?
They aren’t controlled substances in the UK, but they’re not licensed medicines either — they’re sold strictly for research purposes.
Do you provide dosing or cycle guidance?
No. These are sold for research use only, and we don’t provide guidance on dosing, cycling, or administration for personal use.
How is purity verified?
Batch-specific testing with a published Certificate of Analysis, available on the relevant product page.
How does this compare to SARMs for the same research goals?
SARMs act directly on androgen receptors. The peptides here act through growth hormone or growth factor signalling instead — a different mechanism entirely, even where the research interest overlaps. See our UK SARMs guide for that side of the comparison.