Research Peptides in the UK
Tested to ≥99% purity, with a certificate of analysis on request. Weekday orders placed before 2pm leave the same day in plain, tracked packaging, to UK addresses only.
- ≥99% purity Printed on each label
- Out the same day If ordered before 2pm
- Plain box, tracked Delivered across the UK
- Free over £75 £4.95 below that
Buy research peptides from UK stock
Every research compound Diluent sells is held in stock in the United Kingdom. Sizes run from 2mg vials to 500mg, alongside pens, capsules and nasal sprays, plus the bacteriostatic water and swabs that accompany them. Research areas span metabolic and GLP-1 work, the growth hormone axis, repair and recovery, cognitive and sleep, skin and pigment, plus reproductive and cellular research.
Each batch tests at ≥99% by HPLC. On request, the certificate you are sent is the document for the material in your own vial, never a stand-in taken from someone else's. Orders placed before 2pm on a working day go out that same day, tracked, inside an outer box giving no hint of what it holds.
Two vials of one compound, say 10mg and 30mg, can be set side by side with no sums to do, because every size shows its unit price beside its rate per milligram.
Best sellers
Full catalogue →Twelve compounds, ranked with the busiest first. Each one is held in UK stock, and each one lists a rate per milligram next to its vial price.
NAD+
Retatrutide
Tirzepatide
BPC-157
GHK-Cu
TB-500
Ipamorelin
CJC-1295 DAC
MOTS-c
Melanotan 2
Tesamorelin
BPC-157 + TB-500
Metabolic & GLP-1
View all 9 →Incretin receptor agonists sit here alongside the amylin analogue that is co-formulated with them. Semaglutide acts at one receptor, tirzepatide at two and retatrutide at three; that difference is chemical, not a ranking of better and worse.
Retatrutide
Tirzepatide
MOTS-c
SLU-PP-332
Semaglutide
AOD-9604
Repair & Recovery
View all 7 →Most of the published work on this shelf comes from tissue repair and inflammation models. Human trials exist for BPC-157, thymosin alpha-1 and ARA-290; for everything else the record is animal and in-vitro.
BPC-157
TB-500
BPC-157 + TB-500
KPV
Thymosin Alpha-1
ARA-290
Growth Hormone Axis
View all 4 →Usually filed as a single category, this shelf actually spans two receptors. The GHRH analogues, tesamorelin and CJC-1295, act at the GHRH receptor, while ipamorelin is a secretagogue acting at the ghrelin receptor. Replacing one type with the other is not like for like.
Skin & Pigment
View all 4 →The copper tripeptide GHK-Cu and a cyclic melanocortin analogue share this shelf with GLOW and KLOW, the blends built around them. KLOW is simply GLOW with KPV.
Cognitive & Sleep
View all 2 →Neuropeptides whose evidence turns up in unexpected places. Russia registers Semax as a pharmaceutical, and its literature seldom reaches English readers. DSIP was named after the state during which it was isolated, not after any confirmed mechanism.
Cellular & Longevity
View all 3 →This shelf is grouped by target rather than chemistry: a coenzyme, a mitochondria-targeted peptide and a redox dye. NAD+, notably, is not a peptide.
Reproductive & Libido
View all 2 →The pathways on this shelf are entirely unrelated. Kisspeptin-10 sits upstream of gonadotropin-releasing hormone, while PT-141 acts at the melanocortin receptors.
Kisspeptin-10
PT-141
Kits, stacks and blends
View all 15 →Some put separate vials in a single box, some hold components premixed in one vial, and some pair a vial with the kit needed to prepare it. What turns up, and its paperwork, differs between the three; the shelf page explains how.
BPC-157 Starter Kit
Sleep + Recovery Stack
GH Stack
Skin + Repair Stack
Semaglutide + Cagrilintide Blend
Wolverine Stack
Bacteriostatic water and other supplies
View all 4 →Bacteriostatic water is sterile water with benzyl alcohol added; because of that preservative, one vial can be entered many times over. Water for injection and 0.9% saline contain none.
Bacteriostatic Water
Alcohol Swabs
Insulin Syringes 1ml 30G
Pen Needles 32G
Standards at Diluent
Six commitments, each one something you can verify rather than a line of marketing.
Purity, printed and backed up
Every compound goes through HPLC, and ≥99% is the figure on the label. The certificate we send on request is the document for your own material, not a gallery of paperwork that belongs to other batches.
Dispatched from UK stock
With no overseas leg, there is no clearance step and no import charge: everything ships from within the United Kingdom. Orders in before 2pm on a working day leave the same day.
A rate for every milligram
Comparing a 10mg vial with a 40mg one is a question of rate rather than price. Both numbers are printed on every product page, with the sum already worked out.
Discreet, tracked parcels
Tracking covers the whole journey, and nothing on the outer box hints at what it contains.
Clear, complete labels
Compound, strength, format, purity and the research-use statement appear on each label we print. Nothing is ever decanted, combined with anything else or relabelled along the way.
No dosing advice of any kind
What we sell are unlicensed research compounds for laboratory research. Nowhere on this site will you see a dose, protocol, route or frequency, and asking by email will not produce one either.
Placing an order
There is no account to create: add items to the basket and check out. You get a confirmation at once, then payment details by email, because the site itself takes no money. Once the payment clears, the parcel joins the next working-day dispatch.
Tracked postage, to UK addresses only, costs £4.95 and is free above £75. Sealed items can come back within 14 days; for an opened vial, the returns page sets out how the hygiene exemption applies.
Before ordering: common questions
Is it legal to buy research peptides in the UK?
Selling them as laboratory material is lawful, since none of them is a controlled drug. What is not lawful is selling or marketing them for human use, which is exactly why no page here carries any dose, protocol or medical claim. No product in the range has a UK marketing authorisation, and none is sold for human or veterinary use.
When will my order be dispatched?
Weekday orders placed before 2pm go out the same day. After the cut-off, at a weekend or on a bank holiday, the order leaves on the next working day. Tracked, to UK addresses only.
Can I get a certificate of analysis?
Yes. Ask by email and we will send the certificate that covers the material in your vial. Before you order, the compound and size are enough for us to report what the certificate for current stock shows.
How pure are your peptides?
By HPLC, ≥99%. That is a composition result: of all the material detected, it is the share made up of the compound you wanted. The purity and testing page sets out in full where the figure stops.
How much bacteriostatic water goes into a vial?
No single figure applies, since the volume chosen is what decides the strength. For each compound’s own sizes, its product page sets out a table of water volume against mg/ml.
Can you deliver outside the UK?
No. UK addresses only, and a freight-forwarding address does not qualify.
How discreet is the packaging?
Fully. The outer box is plain and reveals nothing of what is inside.
Will you give advice on dosage or on using a compound?
No, neither here nor by email. Each item is supplied for laboratory research use only, as an unlicensed research compound.