UK research-peptide price comparison
Natural Peptides: Endogenous, Nature-Identical and Modified
Three categories worth separating
1. Endogenous peptides are made naturally in the body — hormones, signalling peptides and antioxidants such as glutathione. Research-grade versions are almost always made synthetically with the identical sequence.
2. Nature-identical synthetic peptides have exactly the same sequence as the natural molecule, made by solid-phase synthesis or recombinant expression. Chemically they're the same molecule; "synthetic" describes how it was made, not what it is.
3. Modified analogues start from a natural sequence and change it — swapping amino acids, adding fatty-acid chains, cyclising, or adding stabilising tails — to alter stability or receptor selectivity.
Examples
| Compound | Category | Natural origin |
|---|---|---|
| Glutathione | Endogenous | Made in nearly every cell |
| GHK-Cu | Endogenous | Found in human plasma |
| Oxytocin | Endogenous | Hypothalamic hormone |
| Thymosin alpha-1 | Endogenous | Thymus |
| MOTS-c | Endogenous | Encoded in mitochondrial DNA |
| Kisspeptin | Endogenous | Hypothalamus |
| Sermorelin | Truncated natural fragment | GHRH(1-29) |
| Semaglutide | Modified analogue | Based on GLP-1 |
| Semax | Modified analogue | Based on ACTH(4-10) |
| BPC-157 | Synthetic, modelled on a natural protein fragment | Gastric protein |
Why the distinction matters for buyers
- Identity checks are the same. Natural or not, confirm the sequence by mass spectrometry on a batch certificate of analysis.
- Modified forms change molecular weight, so compare price per mg only within the same form.
- "Natural" doesn't mean safe or approved. Research-grade material isn't a supplement or a medicine.
Research use only
Listings are third-party products for in-vitro laboratory research. They are not for human or veterinary use, and PeptideCompare gives no dosing or usage guidance.
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Frequently asked questions
What are natural (endogenous) peptides?+
Short chains of amino acids that occur naturally in living organisms, acting as hormones, signalling molecules or neurotransmitters. Research material is typically a synthetic, natural-identical version.
Are natural peptides safe for human use?+
Nothing on this site is intended for human or veterinary use. Material listed by suppliers is sold for in-vitro laboratory research only.
How do I compare natural-identical peptide prices?+
Open the peptide's page to see every listed supplier ranked by £ per mg.
Selling research peptides in the UK?
List your products for £10 a month plus £1 per listing — zero sales commission, and ranking is by price per milligram, never by who pays more.
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