What are peptides?
Peptides are short chains of amino acids, the small building blocks that also make proteins. Different peptides do different jobs. The word is a category name, not one product or one treatment.
Peptides explained →THE PEPTIDE LIBRARY
Peptides explained.
Evidence, safety & clarity.
Peptides, without the guesswork. Understand the evidence, explore your options and know what to check before you choose.
UK-focused · Source-linked research · Clear evidence limits
Start here — no science background needed
Peptides, copper peptides and halal: the basics.
What is GHK-Cu?
GHK-Cu is one specific peptide attached to copper. GHK names its three amino acids: glycine, histidine and lysine. Cu is the chemical symbol for copper. It appears in some skincare serums.
Understand GHK-Cu →Are peptides halal or haram?
The name alone cannot tell you. Check what the finished product is made from, how it is manufactured and any relevant certification. An unverified halal status does not mean a product has been established as haram.
Halal and haram explained →Start with the distinction
One word. Different kinds of products.
Peptides are chains of amino acids. Some are used in medicines; others appear in cosmetics, supplements or laboratory research. Their uses and evidence differ. NAD+ is a coenzyme, and has its own guide here.
Evidence at a glance
What do human studies actually show?
A summary of the studies our guides cite — not a ranking of products. “Human evidence” describes those studies only. Updated ; AI-assisted editorial research, not clinically reviewed.
| Substance | Sold in the UK as | Human evidence | What was shown | Not shown |
|---|---|---|---|---|
| GHK-Cu (copper peptide) | Cosmetic ingredient in finished skincare serums | Very limited | One small randomised study after laser resurfacing (13 completed): no significant objective differences; participants reported greater satisfaction. [1] | That over-the-counter serums reverse ageing or treat wounds. |
| Collagen peptides | Food supplement ingredient | Some, product-specific | Placebo-controlled trials of specific preparations reported improvements in skin elasticity and other skin measures over weeks. [1][2] | That every collagen product works, or effects over the longer term and in other groups. |
| BPC-157 | Experimental “research use” material; no authorised UK medicine identified for routine consumer use | Case series only | A 2025 systematic review found 35 preclinical studies and one small retrospective human case series. [1][2] | That it safely or effectively speeds recovery from injury in people. |
| NAD+ precursors (nicotinamide riboside) | Oral supplement ingredient (NAD+ itself is a coenzyme, not a peptide) | Biomarker changes only | Randomised trials found raised blood NAD+ markers and short-term tolerability; one trial found no improvement in insulin sensitivity. [1][2][3] | Anti-ageing, energy or longevity benefits. |
Read the full guide for each substance before buying anything, and check the exact product’s legal status and labelling. Medicine or research material? →
Understand before you choose
Your peptide reading room
10 in-depth guides
Showing 10 guides
Foundations01
Peptides, explained
Understand peptide types, UK access, evidence, safety and the questions to ask before considering a product.
6 min readSources included
Buying safely02
Medicines vs research materials
The differences between authorised medicines, unlicensed clinical supply, cosmetics and research-only peptide materials.
5 min readSources included
Buying safely03
How to read a lab report
Understand certificates of analysis, batch matching, identity, purity, quantity and the limits of peptide testing claims.
6 min readSources included
Skincare04
GHK-Cu & copper peptides
A balanced guide to GHK-Cu in skincare, ingredient labels, research limitations, product comparisons and safe cosmetic use.
6 min readSources included
Evidence05
Collagen peptides
What collagen peptide studies do and do not show, how to read labels, and questions about animal sources and halal suitability.
5 min readSources included
Evidence06
BPC-157: what is known?
Understand the limitations of BPC-157 research, why early findings are not established treatment and what UK readers should check.
5 min readSources included
Cellular health07
NAD+ & cellular health
Understand NAD+, oral precursors, clinical services, evidence limits and the questions to ask about at-home providers.
6 min readSources included
Buying safely08
Peptides: halal or haram?
Peptides and GHK-Cu explained simply, including halal and haram, ingredient sources and how to check product certification before buying in the UK.
8 min readSources included
Buying safely09
Costs & fair comparisons
Compare peptide-related products and clinical services by intended use, total cost, evidence and transparent terms.
5 min readSources included
Buying safely10
GHK-Cu UK seller guide
Compare UK copper peptide skincare from The Ordinary and NIOD, with ingredient checks, evidence limits, halal questions and transparent buying guidance.
6 min readSources included
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The detail matters
Is GHK-Cu halal?
A molecule’s name cannot certify a finished product. Learn what to request, how to check a certificate and why vegan and halal are different claims.
Read the product-check guide →Before comparing prices
Look beyond the purity number.
Understand what a lab report covers, which batch it relates to and the questions a certificate of analysis cannot answer.
Make sense of testing →Sanara’s peptide section is currently an information library. No direct peptide medicine supply is available here. Product availability, prices and any clinical service must be confirmed with the relevant provider.