Buy Pen Starter Kit UK
Pen Starter Kit, supplied for laboratory research use only.
from £121.991 option
- In stock Ships from the UK
- Same-day dispatch Order before 2pm
- Tracked delivery Free over £75
- Certificate of analysis On request
Pen Starter Kit is on the shelf at diluent.co.uk, held in British stock rather than ordered in, priced from £121.99 for the 40mg kit. It is supplied as kit. A weekday order placed before 2pm goes out the same day, tracked, boxed with nothing on the outside about the contents.
Shipping from inside the country is what removes the customs step: no clearance, no import charge, nothing sitting at a border. Purity is ≥99% by HPLC on every batch, and the certificate for the lot you are sent is yours on request against the number on the label.
Delivery runs £4.95, free above £75, tracked start to finish. See how ordering works.
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What is Pen Starter Kit?
Pen Starter Kit is a starter kit: Retatrutide 40mg, with 10 × pen needle, 32g and 10 × alcohol swab, supplied as a vial plus the kit to prepare it. That vial is the one from its own page, unchanged. What the kit buys is a first order that takes one checkout instead of three.
What is in the box?
| Component | Sold separately |
|---|---|
| Retatrutide 40mg | £120.99 |
| 10 × pen needle, 32G | £0.90 |
| 10 × alcohol swab | £0.40 |
What actually arrives?
Open the box and you find a vial plus the kit to prepare it. Vial, bacteriostatic water, syringes and swabs, boxed together. The vial itself is the same one sold on its own.
How a stack, a blend and a kit differ: what arrives in each.
Does the set beat buying each piece on its own?
| Component | Its own price |
|---|---|
| Retatrutide 40mg | £120.99 |
| 10 × pen needle, 32G | £0.90 |
| 10 × alcohol swab | £0.40 |
| Separately, in total | £122.29 |
| Pen Starter Kit | £121.99 |
The box saves £0.30 against buying the components one at a time, roughly 0%. What you save is on the glass, the packing and the postage rather than a discount on the compounds themselves.
Each item listed is also sold separately, and the links go straight there. Want only some of it? Buy those pieces on their own.
Is there any research on this combination?
Nothing published looks at Pen Starter Kit as a combination. The evidence belongs to the individual components, and each one links through to its own page.
Where and how to buy Pen Starter Kit in the UK
How do you order?
Pick a strength from the table, put it in the basket and check out. There is no account to set up. The confirmation reaches you straight away and the payment details follow by email, because no card is taken on the site.
Why does UK stock matter?
The Pen Starter Kit you order leaves a warehouse in Britain. That means no customs step, no import charge and no days lost in transit from abroad. Before 2pm on a working day and it is collected that afternoon, tracked, in an outer box that gives nothing away.
What arrives in the box?
| Purity | ≥99%, by HPLC |
|---|---|
| Labelling | Compound, strength, format, purity, research-use statement and a batch number |
| Certificate of analysis | On request, matched to your batch number |
| Delivery | Tracked, UK only. £4.95, free over £75 |
| Returns | 14 days on unopened, sealed items, terms |
Storing Pen Starter Kit
| Sealed vial | Somewhere cool, dry and dark. For anything long term, the freezer. |
|---|---|
| Once reconstituted | Fridge, standing upright, away from light. Never freeze it once mixed. |
How long does it keep?
| Stored as | Keeps for |
|---|---|
| Sealed, frozen at −20 °C | Years. Nothing holds a lyophilised peptide better than this |
| Sealed, refrigerated at 2–8 °C | Months |
| Sealed, at room temperature | Weeks. Fine while it is in the post, not a place to keep it |
| Reconstituted, refrigerated | Think weeks, not months. Four weeks is the number most people work to once bacteriostatic water is in, which is exactly what its preservative is there for |
| Reconstituted, frozen | Best avoided. Ice crystals tear at peptides, and every freeze–thaw round makes it worse |
Treat these as the usual numbers for lyophilised peptides, not a stability result measured on one batch. Cold and dry buys time; moisture, heat, light and being shaken about take it away. Ask and we will send the batch certificate of analysis.
Is Pen Starter Kit legal in the UK?
We sell Pen Starter Kit as an unlicensed research compound, for laboratory research use only. There is no UK marketing authorisation behind it, it is not a licensed medicine, and it is not for human use, veterinary use or food.
Nothing of this kind is a controlled drug, and selling it as laboratory material is lawful. Selling or marketing it for people to take is not. That line is the reason you will not find a dose, a protocol, a route, a frequency or a medical claim anywhere on this site, and the reason asking for one by email gets the same answer.
A few molecules in this range also appear inside a licensed medicine sold under a brand name. That authorisation belongs to the finished product it was granted for; it does not follow the molecule anywhere else. Full terms.
Pen Starter Kit questions
Where can I buy Pen Starter Kit in the UK?
Pen Starter Kit is available in the UK from diluent.co.uk, from £121.99, a single 40mg size, as a starter kit. The warehouse is in the UK, not overseas, which takes out the clearance wait, the handling fee and the chance of it being seized. That lands at £3.05 the milligram. Get the order in before 2pm on a weekday and it leaves that day, tracked, plainly packaged. Batches go to a third-party lab and come back at ≥99% by HPLC, and the certificate for yours is there if you ask, see how to order.
How much does Pen Starter Kit cost?
It starts at £121.99 for the 40mg, £3.05 per mg. Postage runs £4.95, and nothing at all above £75.
What purity is your Pen Starter Kit, and can I see a certificate?
≥99%, measured by HPLC. Quote the batch number on your label and we will send the certificate of analysis for that lot. If you would rather see where current stock sits before you commit, ask and we will tell you.