Peptides are a recurring subject in research on metabolism, tissue repair and cellular biology. But what is a peptide, and how do the different research families compare? This introductory guide explains the essentials: what peptides are, which groups are commonly studied, and how they are stored and prepared in the laboratory.
Key points
- A peptide is a short chain of amino acids, the same building blocks that make up proteins.
- Research peptides fall into several broad families, from metabolic to cognitive research.
- Most are supplied as lyophilised powder and reconstituted with bacteriostatic water.
- Cold, dark storage helps preserve stability.
- Supplier transparency and documentation matter when sourcing research materials.
What are peptides?
A peptide is a short sequence of amino acids linked together. Proteins are made from the same building blocks, but peptides are considerably shorter. In biological systems, naturally occurring peptides act as signalling molecules, taking part in hormonal regulation, communication between cells and repair processes. In research, synthetic peptides are investigated for their interactions with specific biological pathways.
The main families of research peptides
Research peptides are usually grouped by the area of research in which they are studied:
- Metabolic research – for example Retatrutide and peptides from the GLP-1 family.
- Tissue repair research – for example BPC-157 and TB-500.
- Skin and cosmetic science research – for example GHK-Cu and GLOW.
- Growth hormone axis research – for example CJC-1295 + Ipamorelin and Tesamorelin.
- Cognitive research – for example Semax and Selank.
How research peptides are supplied and stored
Lyophilised powder
Most research peptides are supplied as a freeze-dried (lyophilised) powder. Before laboratory use, the powder is dissolved, a step known as reconstitution, usually with bacteriostatic water. Our reconstitution calculator makes it easier to work out concentrations accurately.
Storage
Correct storage is important for the stability of the compound. In general, peptides are kept refrigerated and protected from light.
What to look for in a supplier
Quality varies considerably across this market. It pays to check how transparent a supplier is about sourcing, what factual information accompanies each product and whether packaging is appropriate. Independent documentation, such as the certificates on our lab tests page, lets you assess materials on evidence rather than marketing claims.
Frequently asked questions
What is the difference between a peptide and a protein?
Chiefly size. Peptides are short amino acid chains, whereas proteins are longer and structurally more complex.
Why is bacteriostatic water used?
It is used to dissolve the lyophilised powder before laboratory use, and it contains a preservative that inhibits bacterial growth.
Further reading
For quick answers to common questions, see our peptides FAQ. If you are sourcing materials, our guide to buying research peptides in the UK explains what to check.
Research use only
This article is for general educational purposes and is not medical advice. All Evil Peptides products are research reference materials for laboratory use only. They are not medicines and are not for human or veterinary consumption.