Same-day dispatch on orders placed before 2pm · Tracked UK delivery
Diluent, UK Research Peptides
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Buy Peptides UK

Research peptides for sale in the UK: fifty compounds held and shipped from here, as vials, pens, capsules and nasal sprays, ≥99% purity, certificate of analysis on request, same-day dispatch before 2pm.

Diluent supplies research peptides from British stock. Nothing on this page is ordered in when you buy it, so a weekday order placed before 2pm goes out the same day on a tracked service, no customs clearance, no import charge and no parcel waiting at a border.

Seven research areas, fifty compounds, ninety-one sizes and formats between them. Every one shows a unit price and a rate per milligram. HPLC puts each batch at ≥99%, and the certificate covering the batch you are sent is yours on request against the number on its label. See how ordering works.

Metabolic & GLP-1

Shelf →
Retatrutide Retatrutide
£28.99
Tirzepatide Tirzepatide
£25.99
MOTS-c MOTS-c
£15.99
SLU-PP-332 SLU-PP-332
£29.99
Semaglutide Semaglutide
£9.99
AOD-9604 AOD-9604
£17.99
5-Amino-1MQ 5-Amino-1MQ
£35.99
Cagrilintide Cagrilintide
£38.99
Tesofensine Tesofensine
500mcg £53.99

Repair & Recovery

Shelf →
BPC-157 BPC-157
£19.99
TB-500 TB-500
10mg £32.99
BPC-157 + TB-500 BPC-157 + TB-500
£27.99
KPV KPV
£21.99
Thymosin Alpha-1 Thymosin Alpha-1
£62.99
ARA-290 ARA-290
10mg £61.99
VIP VIP
10mg £26.99

Growth Hormone Axis

Shelf →
Ipamorelin Ipamorelin
£19.99
CJC-1295 DAC CJC-1295 DAC
2mg £18.99
Tesamorelin Tesamorelin
10mg £31.99
CJC-1295 + Ipamorelin CJC-1295 + Ipamorelin
£59.99

Skin & Pigment

Shelf →
GHK-Cu GHK-Cu
£24.99
Melanotan 2 Melanotan 2
nasal spray £24.99
GLOW GLOW
£55.99
KLOW KLOW
£71.99

Cognitive & Sleep

Shelf →
Semax Semax
£18.99
DSIP DSIP
5mg £19.99

Cellular & Longevity

Shelf →
NAD+ NAD+
500mg £33.99
SS-31 SS-31
£26.99
Methylene Blue Methylene Blue
10mg £44.99

Reproductive & Libido

Shelf →
Kisspeptin-10 Kisspeptin-10
£17.99
PT-141 PT-141
10mg £20.99

Stacks, Blends & Kits

Shelf →
BPC-157 Starter Kit BPC-157 Starter Kit
10mg £37.99
Dual Agonist Stack Dual Agonist Stack
stack £110.99
GH Stack GH Stack
stack £40.99
Metabolic Stack Metabolic Stack
stack £99.99
Pen Starter Kit Pen Starter Kit
40mg £121.99
Recomp Stack Recomp Stack
stack £68.99
Recovery Stack Recovery Stack
stack £69.99
Retatrutide + Cagrilintide Blend Retatrutide + Cagrilintide Blend
10mg/5mg £70.99
Retatrutide Starter Kit Retatrutide Starter Kit
10mg £57.99
Semaglutide + Cagrilintide Blend Semaglutide + Cagrilintide Blend
5mg/5mg £46.99
Skin + Repair Stack Skin + Repair Stack
stack £42.99
Sleep + Recovery Stack Sleep + Recovery Stack
stack £38.99
Tirzepatide + Cagrilintide Blend Tirzepatide + Cagrilintide Blend
10mg/5mg £67.99
Tirzepatide Starter Kit Tirzepatide Starter Kit
10mg £53.99
Wolverine Stack Wolverine Stack
stack £49.99

Lab Supplies

Shelf →
Bacteriostatic Water Bacteriostatic Water
£5.49
Alcohol Swabs Alcohol Swabs
100 pack £3.99
Insulin Syringes 1ml 30G Insulin Syringes 1ml 30G
100 pack £9.99
Pen Needles 32G Pen Needles 32G
100 pack £8.99

Choosing a peptide supplier in the UK

Whoever you end up buying from, the same handful of questions apply, and every one of them can be settled before money changes hands. What to check in a UK peptide supplier takes them one at a time, ours included, and says where we are the wrong shop.

What to check, and what we publish
AskHere
Where does it ship from?From inside the UK. There is no border on the route, so no clearance stage and no import charge.
What purity, and measured how?≥99% by HPLC, printed on every label next to its batch number.
Can I see the certificate?Ask and it is yours, tied to the batch number on the vial you actually received rather than some other lot.
Is the price per vial or per milligram?You get both. Each size shows its own milligram rate, which is what makes two sizes comparable.
What arrives?A sealed vial of freeze-dried powder, unless the compound is sold as a pen, capsules or a spray.
What is it for?Laboratory research, full stop. None of it is a licensed medicine, we are no pharmacy, and we publish no dosage or protocol guidance.

What are research peptides?

Amino acids strung together on peptide bonds, in a short chain: that is a peptide. Push the chain beyond about fifty residues and the usual word becomes protein, though that line is convention rather than law. Our shortest is three residues (KPV) and our longest twenty-eight (Thymosin Alpha-1).

Plenty of what gets sold under this heading is not a peptide at all, and we would rather say so than let it slide. NAD+ is a coenzyme made of two nucleotides. 5-Amino-1MQ and SLU-PP-332 are small molecules. Methylene blue is a dye of the phenothiazine family. They are here because the literature files them next to the peptides, not because the chemistry matches.

"Research" names the supply category. It is not sales language. What that category means is unlicensed compounds, sold for laboratory work. Not one of them carries a UK marketing authorisation, not one is a licensed medicine, and not one is supplied for human or veterinary use.

What formats do research peptides come in?

The four formats, and what each one means in practice
FormatWhat arrivesPreparationStorage
Lyophilised vialFreeze-dried powder under vacuumReconstitute with bacteriostatic waterYears frozen, months refrigerated
PenPre-filled, already in solutionNoneRefrigerated from arrival
CapsulesFinished solid formNoneCool, dry, sealed
Nasal sprayReady-to-use solutionNoneRefrigerated from arrival

Most of what we sell comes in a vial, and the reason is chemistry rather than cost. Degradation reactions need water; freeze-drying takes it away, and that is the only thing making a peptide postable in the first place. The three other formats appear wherever skipping the preparation step is worth it.

How do you buy research peptides in the UK?

Buy from somebody whose stock is already in the country. That one fact separates a two-day delivery from a three-week one. Anything posted in from abroad has to clear customs, may pick up an import charge and a handling fee on the way, and can be stopped or seized outright. Nothing you order here goes near a border.

What an order looks like
AccountNone needed. A name, address and email at checkout
DispatchThat day inside 2pm on a weekday, otherwise the next
DeliveryTracked, UK only. £4.95, free over £75
PackagingA plain box, silent about what is inside
PaymentEmailed after you order. The site charges nothing
Returns14 days, provided the seal is intact

How to order, step by step →

What does the published research on these compounds cover?

Enormously, and the honest answer is that the evidence is patchy. A few of these have been through human trials. The majority never have. Here it is by research area, with the model each study used:

Where the published work sits, by research area
AreaStrongest published evidence
Metabolic and GLP-1 Phase 3 human trials for semaglutide and tirzepatide, including a head-to-head (doi:10.1056/NEJMoa2416394). Retatrutide is at phase 2 (PMID 37366315).
Repair and recovery BPC-157 has human trials in gastrointestinal medicine (PMID 17186181); the rest of the shelf is rodent and in-vitro work.
Growth hormone axis Tesamorelin has a meta-analysis of five randomised controlled trials (PMID 41545261); CJC-1295 a randomised placebo-controlled trial in healthy adults (PMID 16352683).
Skin and pigment GHK-Cu is review and gene-expression work (PMID 29986520) rather than clinical trials.
Cognitive and sleep Semax has rat BDNF work (PMID 14556513) and one non-randomised 110-patient study.
Reproductive Kisspeptin-10 has human studies in healthy volunteers (PMID 21976724).

Each compound page has its own reference list, sorted by study model, every paper linked so you can go and read it. Where the record behind a compound is thin, its page says as much.

All of the above describes what researchers set out to examine. None of it claims an effect in a person, and nowhere on this site will you find a dose, a protocol, a route or a frequency.

How are research peptides prepared?

What lands on your doorstep is dry powder, brought back with bacteriostatic water, which is sterile water carrying benzyl alcohol. That preservative is exactly why a vial can be entered more than once. All the volume decides is strength. Whatever you add, the vial still contains what its label claims.

Concentration from a 10mg vial
Water addedConcentration
1 ml10 mg/ml
2 ml5 mg/ml
3 ml3.33 mg/ml
5 ml2 mg/ml

The same table appears on every product page, worked through for that compound's own sizes. Before you start: let a cold vial warm up, wipe the stopper, aim the water at the glass wall instead of the powder, and roll rather than shake it. Foam means denatured protein, and you can see it happening.

How should research peptides be stored?

General figures for a lyophilised peptide
Stored asKeeps for
Sealed, frozen at −20 °CYears
Sealed, refrigerated at 2–8 °CMonths
Sealed, room temperatureWeeks, fine for transit, not for storage
Reconstituted, refrigeratedWeeks; around four is the figure usually worked to
Reconstituted, frozenNot recommended, ice crystals damage peptides

Cold and dry buys time; water, heat, light and being shaken about spend it. Worth knowing that moving something in and out of the fridge harms it more than leaving it on a warm shelf would, so choose a spot and leave it alone.

Nothing in this catalogue is a controlled drug, and selling it as laboratory material is lawful. Selling or marketing it for people to take is not: that falls under the Human Medicines Regulations 2012. It is the reason no page here carries a dose, a protocol, a route, a frequency or a medical claim, and the reason an email asking for one gets the same answer.

Some of these molecules also sit inside licensed medicines sold under brand names. The authorisation in those cases belongs to the finished product: one manufacturer, one formulation, one presentation, one approved use. It does not follow the molecule anywhere. Full terms.

Research use only. Diluent supplies compounds for laboratory research. Nothing we sell is a licensed medicine, we are not a pharmacy, and we publish no dosage, protocol or administration guidance. Not for human or veterinary use, and not for use in food.

Research peptide questions

Where can I buy research peptides in the UK?

Here. Diluent keeps fifty compounds on the shelf in the UK and sends them out the same working day when the order lands before 2pm, tracked and plainly packaged. Nothing travels in from overseas, which is why there is no customs clearance, no import charge and nothing sitting at a border.

What purity are your research peptides?

HPLC puts it at ≥99%. The certificate for your own batch is available on request, matched to the number on your label.

How quickly do you dispatch?

Inside 2pm on a weekday, it leaves that day. Outside it, or on a weekend or bank holiday, the next working day. Tracked, and UK addresses only.

Do you ship outside the UK?

We do not. UK addresses only, and freight-forwarding addresses are not accepted either.

How much bacteriostatic water do I add to a vial?

That is yours to decide, because the volume is what sets the strength. Put 2ml into a 10mg vial and you have 5 mg/ml; put in 1ml and you have 10 mg/ml. Each product page works the table through for that compound's own sizes.

How long do research peptides keep?

Sealed and freeze-dried, it will hold for years at −20 °C, months in a fridge, weeks at room temperature. Mixed and refrigerated, think weeks instead of months. Once it is a solution, never freeze it.

Do you publish dosage information?

We do not, and asking by email gets the same answer. Every item here is an unlicensed research compound for laboratory use. What you will find instead is the reconstitution arithmetic and the storage conditions, which describe a solution and a material rather than telling anyone what to do with them.