Short answer
Peptides are molecules made from amino-acid residues joined by peptide bonds. Sequence is conventionally read from the N-terminus to the C-terminus. A name alone does not specify the complete material: terminal groups, chemical modifications and formulation can matter to an experiment.
How are peptides different from proteins?
Peptide and protein are overlapping terms whose boundary depends on convention and context, rather than a universal length cutoff. Length does not determine every property or the production method. For a laboratory comparison, record the sequence and chemical form first, then compare material quantities and experimental conditions.
Why do specific names appear so quickly?
Different names describe different molecules and evidence. BPC-157 is a 15-residue sequence investigated in preclinical models. A 2012 study identified Ac-LKKTETQ in a TB-500 sample; that fragment is distinct from full-length thymosin beta-4. Semaglutide appears in defined authorised medicines, including an oral preparation. Research on one formulation or model does not validate another product bearing the same name.
Medicine or laboratory reagent
The MHRA guidance on borderline medicines (updated 2 July 2026; checked 5 October 2026) considers both how a product is presented and its pharmacological, immunological or metabolic function. It also considers intended use, labelling, websites and promotional claims. A research label does not settle the classification or grant import permission. A professional laboratory should obtain a product-specific assessment rather than infer eligibility from an EU supplier address or a certificate of analysis.
Before comparing an EU offer for a UK address
Confirm that the selected partner accepts the exact delivery address and product before calculating the cost. An EU dispatch location is not a UK import permission. Great Britain and Northern Ireland have different rules for some goods movements; check the destination, classification, transport charges and taxes already collected at checkout. A certificate of analysis does not replace customs documents or any required authorisation.
Lab reports
The right next page if you want batch documents, analytical data, and something more concrete than general copy.
Research disclaimer
A short page that explains the research-only frame and the limits of this kind of information.
Research summaries
Broader reading if you want to continue into specific topics after the basic explanation.