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Semax Pen vs Vial UK: Which Is Better for Research?
Semax pen vs vial: pre-filled pens vs freeze-dried vials, cost per mg compared, and which to choose for research.
Quick answer
A Semax pen comes pre-filled in a calibrated 3ml cartridge, so there is no mixing and every click measures exactly 0.01ml. A Semax vial is freeze-dried powder that the researcher reconstitutes with bacteriostatic water. Pens are the easiest and most consistent to measure. Vials are the lowest cost per mg. For laboratory research use only.
Semax pen vs vial at a glance
| Feature | Semax Pen | Semax Vial |
|---|---|---|
| Format | Pre-filled 3ml cartridge | Lyophilised powder |
| Mixing needed? | No | Yes, with bacteriostatic water |
| How it is measured | Dial clicks (1 click = 0.01ml) | Syringe units |
| At MyPep | Semax 40mg pen | Semax 10mg vial, Semax 30mg vial |
Free Peptide Calculator UK
Working out reconstitution? Use our peptide calculator to find the bacteriostatic water volume, concentration per ml and pen clicks for any vial or pen strength.
Semax pen vs vial price UK (cost per mg)
| Product | Price | Cost per mg |
|---|---|---|
| Semax 40mg pen | £64.99 | £1.62 |
| Semax 10mg vial | £19.99 | £2.00 |
| Semax 30mg vial | £34.99 | £1.17 ⭐ lowest per mg |
A vial also needs bacteriostatic water and syringes, so the full cost of a vial set-up is a little higher than the vial price alone.
How a Semax pen works
Each MyPep pen holds a 3ml cartridge with 300 clicks. One click is 0.01ml, so the amount per click depends on the total in the pen. On the Semax 40mg pen each click holds about 0.133mg.
How a Semax vial works
A vial holds freeze-dried powder. In the lab it is reconstituted with bacteriostatic water, and the amount drawn up is measured in syringe units. Our free peptide calculator works out the units for any vial and water amount.
Pros and cons
- Pen ✅ no mixing, no syringe maths, every click the same, easy to store.
- Pen ⚠️ costs more per mg than a vial.
- Vial ✅ lowest cost per mg, flexible concentration.
- Vial ⚠️ needs reconstitution, bacteriostatic water and syringes, and more room for measuring errors.
Which should you choose?
If you want the simplest set-up and the most consistent measuring, choose the Semax pen. If your lab already reconstitutes peptides and wants flexible concentrations, choose the vial. Also compare Selank in our Semax vs Selank guide.
Frequently Asked Questions
Is a Semax pen better than a vial?
A pen is easier and more consistent to measure, while a vial gives more flexibility. Which is better depends on the research set-up.
Is a Semax pen cheaper than a vial?
The lowest cost per mg at MyPep is the Semax 30mg vial, about £1.17 per mg.
Do you need to mix a Semax pen?
No. MyPep pens are pre-filled, so no reconstitution or bacteriostatic water is needed.
Is Semax a licensed medicine?
No. MyPep Biotech Semax is a research material only. Not for human or veterinary use.
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