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Bangkok Peptides · Pre-filled pen
Peptide pen guide
Handling, storage and the concentration maths for every Bangkok Peptides pre-filled research pen. Select your pen to see its numbers.
Research use onlySupplied strictly for laboratory research. Not for human or veterinary use.
Total
Concentration
Per unit
Per 60-unit dial
How the pen measures
Every Bangkok Peptides pen uses the same dial. Retatrutide 10–30 mg pens hold 2 mL. The Retatrutide 40 mg pen is a dual-chamber pen you mix yourself: 1.5 mL across 110 clicks (1 click ≈ 0.0136 mL). Every other pen holds 3 mL.
1
Click = 1 unit
Each click of the dial is 0.01 mL of solution (about 0.0136 mL on the Retatrutide 40 mg dual-chamber pen).
300
Units per pen
3 mL in total (2 mL / 200 units on Retatrutide; 1.5 mL / 110 clicks on Retatrutide 40 mg). Around 2% is used up by priming.
60
Units per dial
The maximum in one go. Larger volumes take more than one dial.
Pen calculator
Convert an amount in mg or mcg into units on the dial.
Handling the pen
Six steps, the same for every pen.
- 01Check the cartridge
The solution should be clear. If it’s cloudy, discoloured or has particles, don’t use it and message us.
- 02Fit a new pen needle
Use a fresh, sterile pen needle each time and remove both caps.
- 03Prime before first use
Dial 2 units, point the needle up, tap the cartridge and press until a drop appears at the tip.
- 04Dial the volume
Turn the dial to the units you need. Use the calculator to convert mg or mcg.
- 05Press and hold
Press the button fully and hold for about 10 seconds so the full volume is delivered.
- 06Remove and recap
Take the needle off, put it in a sharps container and replace the pen cap.
Storage
Pens ship chilled with gel packs.
| Temperature | Refrigerate at 2–8 °C. Do not freeze. |
| Light | Keep the cap on and store the pen in its box, away from direct light. |
| On arrival | Put the pen in the fridge as soon as it arrives. |
| Between uses | Remove the needle and return the pen to the fridge straight away. |
| Disposal | Used needles go in a sharps container. Never share pens or needles. |
Questions
How many units are in one pen?
300 units (3 mL) on most pens; 200 units (2 mL) on Retatrutide 10–30 mg pens, and 110 clicks (1.5 mL) on the Retatrutide 40 mg dual-chamber pen. After priming expect around 294 usable units on a 3 mL pen (four full 60-unit dials and a final dial of roughly 54), or around 196 on a 2 mL Retatrutide pen (three full dials and a final dial of roughly 16). On the Retatrutide 40 mg dual-chamber pen, mixing adds a few extra priming clicks on first use, so from its 110 clicks expect one full 60-click dial and a shorter last dial.
How do I work out the concentration?
Divide the total amount on the label by the fill volume: 2 mL for Retatrutide (1.5 mL for the 40 mg pen), 3 mL for every other pen. A 10 mg pen at 3 mL is 3.33 mg/mL, so each unit (0.01 mL) holds 33.3 mcg. A 10 mg Retatrutide pen at 2 mL is 5 mg/mL, or 50 mcg per unit. A 40 mg Retatrutide dual-chamber pen at 1.5 mL is 26.67 mg/mL; with 110 clicks per pen each click is about 0.0136 mL, or 363.6 mcg.
The volume I need is more than 60 units
The dial stops at 60. Deliver 60 units, then dial the remainder. The calculator shows the split.
The pen was left out of the fridge
Put it back in the fridge as soon as possible and message us with how long it was out. Don’t use it if the solution has changed appearance.
Which needles fit the pen?
Standard screw-on pen needles. Bangkok Peptides pen kits include 10 needles and alcohol swabs.
