Semaglutide 10mg / 20mg / 30mg
Also known as Sema
Long-acting GLP-1 receptor analogue — 10mg, 20mg and 30mg lyophilised vials at ≥98% purity for in vitro incretin and receptor-binding research.
Supplied as a lyophilised vial for you to reconstitute — use our calculator for your target concentration.
For In Vitro Use Only — Not for Human Use
Every batch is independently HPLC & mass-spec tested. Certificate of Analysis is batch-numbered and matched to the vial you receive.
Overview
Semaglutide is a long-acting 31-residue GLP-1 receptor analogue with a C18 fatty-diacid modification at Lys26 that extends its plasma half-life relative to native GLP-1. Supplied as a 30mg sterile lyophilised powder, verified to ≥98% purity by RP-HPLC and confirmed by mass spectrometry.
Research
Semaglutide is a reference GLP-1 agonist in in vitro receptor pharmacology — used to characterise cAMP response, β-arrestin recruitment, receptor internalisation and comparator responses when benchmarking dual (Tirzepatide) and triple (Retatrutide) agonists.
Sema Pen UK — how to use a Semaglutide pen
Select the Pen format above and we prepare your semaglutide peptide vial as a pre-filled, calibrated dial-a-dose Sema pen in the UK, cold-shipped with a clicks-per-mg card. Prefer to mix your own? Keep the Vial format selected — same peptide, same batch, same 99%+ HPLC purity.
- Step 1Bring the pen to room temperature
Take the Semaglutide pen out of the fridge 10–15 minutes before use. Cold solution is thicker and dispenses less accurately. Never microwave, warm in hot water or shake the pen.
- Step 2Inspect the cartridge
Hold the pen to the light. Reconstituted Semaglutide should be clear and colourless with no particles or cloudiness. If it looks off, stop and contact us.
- Step 3Attach a fresh needle
Wipe the septum with an alcohol swab, then screw on a new 32G 6mm pen needle. Use a new needle every time — reused needles blunt, contaminate and cause dose loss.
- Step 4Prime the pen
Dial 2 units, point the needle upwards and press until a droplet appears at the tip. Priming clears the air gap so the first dose is a full dose.
- Step 5Dial the dose in clicks
One click equals 0.01mL. At 30mg in 3mL (10mg/mL) one click is 0.1mg, so 0.5mg is 5 clicks and 1mg is 10 clicks. Use the calibrated clicks-per-mg card in your box or our free reconstitution calculator.
- Step 6Dispense and hold
Press the plunger fully and hold for 6–10 seconds before withdrawing so the full dialled volume is delivered.
- Step 7Remove the needle and refrigerate
Unscrew and bin the needle in a sharps container — never store the pen with a needle attached. Return the pen to 2–8°C.
Sema pen FAQs (Semaglutide pens & vials)
Peptides UK 4U supplies Semaglutide pens (Sema pens) from our UK facility. Choose your strength and select the Pen format on this page — we reconstitute it under sterile conditions, cold-pack it and dispatch the same working day on orders before 2pm. For In Vitro Use Only — Not for Human Use.
The Sema pen price is the vial price plus the Quick Pen preparation, shown as one all-in price the moment you select the Pen format above — no separate add-on and no hidden reconstitution fee.
A Sema pen is a dial-a-dose injection pen pre-loaded with reconstituted research-grade semaglutide peptide, filled in a controlled UK environment at a set concentration so the clicks-per-mg are calibrated before it reaches you.
Yes. Semaglutide is a synthetic GLP-1 receptor agonist peptide. We supply it as research-grade lyophilised peptide in vials, or pre-filled into a Quick Pen, strictly for in vitro laboratory research.
One click is 0.01mL. At 10mg/mL (30mg in 3mL) one click is 0.1mg, so 0.25mg is about 3 clicks and 1mg is 10 clicks. Every pen ships with a card calibrated to the exact strength you ordered.
The peptide is identical. Vials give maximum dosing flexibility but need bacteriostatic water, sterile technique and syringe maths. Pens arrive ready to dose with calibrated clicks and are easier to store and travel with.
No. Ozempic, Wegovy and FlexTouch are registered trade marks of Novo Nordisk and are licensed prescription medicines. We are not affiliated with, endorsed by or connected to Novo Nordisk. Our Quick Pen is a reusable research device filled with research-grade semaglutide for laboratory use only — not a medicine and not interchangeable.
In insulated cold packaging via Royal Mail Tracked 24, in plain discreet outer packaging. Orders placed before 2pm on a working day are dispatched the same day from our UK premises.
Yes — the pen takes standard screw-on pen needles. We recommend 32G 6mm and stock them on-site, and free needles and alcohol swabs are included with every order.
For In Vitro Use Only — Not for Human Use. Not a licensed medicine in the UK. Ozempic, Wegovy and FlexTouch are registered trade marks of Novo Nordisk; Peptides UK 4U is not affiliated with Novo Nordisk.
How long does a Semaglutide vial last?
Weekly research allocations matched to the Ozempic / Wegovy dose range. See vial life and weekly cost for each strength.
| Weekly allocation | 10mg vial £49.99 | 20mg vial £72.99 | 30mg vial £109.99 | Best value |
|---|---|---|---|---|
| 0.25mg/week Ozempic/Wegovy-equivalent | 40 weeks £1.25/week | 80 weeks £0.91/week | 120 weeks £0.92/week | £0.91/week £72.99 20mg vial Save 98% vs Ozempic/Wegovy |
| 0.5mg/week Ozempic/Wegovy-equivalent | 20 weeks £2.50/week | 40 weeks £1.82/week | 60 weeks £1.83/week | £1.82/week £72.99 20mg vial Save 95% vs Ozempic/Wegovy |
| 1mg/week Ozempic/Wegovy-equivalent | 10 weeks £5.00/week | 20 weeks £3.65/week | 30 weeks £3.67/week | £3.65/week £72.99 20mg vial Save 91% vs Ozempic/Wegovy |
| 1.7mg/week Ozempic/Wegovy-equivalent | 5w 6d £8.50/week | 11w 5d £6.20/week | 17w 5d £6.23/week | £6.20/week £72.99 20mg vial Save 84% vs Ozempic/Wegovy |
| 2.4mg/week Ozempic/Wegovy-equivalent | 4w 1d £12.00/week | 8w 2d £8.76/week | 12w 4d £8.80/week | £8.76/week £72.99 20mg vial Save 78% vs Ozempic/Wegovy |
For in vitro research use only — not for human use. Ozempic and Wegovy are licensed prescription medicines; this table is a cost-per-milligram illustration for researchers, not medical advice or a recommendation to replace a prescription. The comparator price is editable so you can match the figure you see quoted by UK private clinics.
Calculations assume the entire vial is allocated at the stated weekly dose. Actual vial life depends on the exact protocol.
