Build a custom peptide pen

A peptide pen is a dial-a-dose dispensing device built around a standard 3 mL pharmaceutical glass cartridge. A sealed cartridge holding the reconstituted research compound sits inside the barrel; a click-indexed dose wheel advances a threaded push rod by a fixed increment per click; a single-use screw-on needle dispenses the measured volume. It replaces the vial-and-syringe workflow with a repeatable mechanical measurement.

The reusable pen (SKU AR-PEN-01) ships with the device body, a protective cap and a printed handling card. Needles and cartridges are sold separately. The AR-PEN-02 starter kit bundles the pen with a 100-pack of AR-PEN-N 32G needles so a lab has everything needed to begin cartridge-based dispensing.

A prefilled pen arrives as a complete, assembled unit filled with one compound and is dispensed until the cartridge is empty. A cartridge refill is just the filled 3 mL cartridge — it drops into the reusable Ares Precision Pen, which lowers the cost of every fill after the first.

Every injectable compound in the Ares catalog can be supplied as a prefilled pen or cartridge refill, at any vial size listed on the product page. GLP-3RT is the most requested pen fill. Capsules, nasal sprays, topical solutions and research-support items are not available in pen format.

Unscrew the barrel from the dose mechanism. Slide a cartridge into the barrel septum-end first, then reattach the barrel to the mechanism and hand-tighten until seated. The push rod inside the mechanism resets automatically on most pen designs; if yours has a visible extended rod, press the dose button to retract it before loading. No tools are required.

Peel the foil seal from a fresh single-use pen needle, hold it straight against the threaded hub at the front of the pen, and screw clockwise until snug — about one full turn past first resistance. Remove the outer cap and keep the inner needle shield in place until you are ready to dispense. Do not overtighten; a snug fit is enough to pierce the septum cleanly.

Before the first dispense from a new cartridge, dial two clicks and hold the pen needle-up. Tap the barrel gently so any air bubble rises to the needle, then press the dose button fully. A droplet at the needle tip confirms the fluid path is clear. Repeat once if no droplet appears. Prime once per cartridge, not before every dispense.

Remove and discard the needle. Unscrew the barrel, slide out the empty cartridge, and insert the refill septum-end first. Reattach the barrel, fit a fresh needle, and prime with a two-click air-shot before the first measured dispense.

We supply AR-PEN-C empty 3 mL cartridges for labs that reconstitute and fill in-house under their own protocols. Filled cartridges purchased from Ares are machine-filled and sealed; opening a filled cartridge voids the batch traceability on the fill.

Each fill uses the same batch lyophilized material as the corresponding vial SKU, reconstituted to a defined concentration and machine-filled into sterile 3 mL cartridges. The batch COA published on the product page applies to the pen fill.

Pen fills are built to order — the compound is reconstituted, filled and sealed after checkout rather than pulled from a shelf. Allow 7–10 business days for assembly before the order ships. Hardware (pens, needles, empty cartridges) ships from stock; mixed orders ship together once the fill is complete.

No. Each cartridge holds a single compound so the batch COA, concentration and stability profile stay unambiguous. Researchers working with multiple compounds use one pen or cartridge per compound.

Each click of the dose wheel advances the threaded push rod by a fixed increment, displacing a fixed volume from the cartridge. Counting clicks replaces reading a syringe barrel, so repeated dispenses are mechanically consistent. The click increment and volume-per-click for your fill concentration are printed on the handling card included with the order.

With a fresh needle attached and the cartridge primed, dial the wheel to the number of clicks for the target volume, hold the pen needle-down over the receiving vessel or lab apparatus, and press the dose button fully until the dial returns to zero. Hold for a slow count of five so the full volume clears the needle, then withdraw.

The dial will not advance past the remaining volume in the cartridge — the pen physically prevents over-dialing. The remaining clicks shown are what is left. Finish the dispense and load a fresh cartridge for the remainder.

Divide the target mass by the concentration of your fill to get volume, then divide volume by the volume-per-click on the handling card. The card shipped with each fill lists the exact click increments for that batch's concentration so the arithmetic is done for you.

Refrigerate at 2–8 °C, store upright, and keep away from light. Do not freeze — a frozen cartridge can crack the glass and degrade the fill. Do not store the pen with a needle attached; remove the needle after every dispense so the septum reseals and the fill is not exposed to air.

Reconstituted material is less stable than lyophilized powder. Kept refrigerated, upright and needle-free between uses, a fill is intended to be consumed within the window printed on its label — typically 28–30 days from the fill date. Discard any fill that becomes cloudy, discolored or develops particles.

For lab transport, keep the pen in an insulated carrier with a cold pack, cap on and needle removed. Avoid temperature excursions above room temperature for extended periods and never leave the pen in a hot vehicle or checked luggage.

Wipe the exterior with a lint-free cloth dampened with 70% isopropyl alcohol. Never immerse the mechanism in liquid or run it under water — the internal threading and dose mechanism are not waterproof. The barrel can be wiped when changing cartridges.

No. All Ares products — pens, cartridges, needles and compounds — are supplied strictly for laboratory and research use. They are not drugs or medical devices, are not sterile-injectable grade for human administration, and are not for human or veterinary use. Nothing on this page is dosing or administration guidance.

Treat every pen needle as a sharp. Use a fresh needle for every dispense, never recap a used needle by hand, and dispose of needles immediately in a rigid sharps container. Needles are single-use; reuse dulls the tip, compromises the septum and risks contamination of the cartridge.

Pen fills are made to order for a single customer and, like all research material, are final sale. Unopened hardware — pens, needles and empty cartridges — follows the standard returns policy on the shipping and returns page. If a pen arrives damaged or a fill looks wrong on arrival, contact support before use and we will make it right.

Every fill is labeled with the compound, concentration, fill date and batch number, matching the third-party COA published on the product page. Scan the COA link on the product page or contact support with your batch number for the certificate.