Pre-filled — no reconstitution Lot 26078 — 99.636% HPLC purity Same-day dispatch before 2 PM PT Tracked cold-chain — ships from Los Angeles For laboratory research only
the alt pen. [alt]
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the alt pen — matte black reusable dose pen with silver label and glass cartridge
Pre-filled research pen systems

The compound is already inside.

Three pens. No reconstitution. No bacteriostatic water. Sealed, pre-mixed cartridges in a reusable black pen body.

Shop pens → The technology
3 mLCartridge
300 uPer pen
99.6%HPLC purity
2–8 °CCold-chain

Three pens. One system.

Pack pricing applied in the cart · 2 pens −10% · 3+ −15%
the alt pen reta 40mg — black pen with silver label and clear cartridge

Retatrutide 40mg

$599
Fat loss · max strength · triple agonist In stock
the alt pen reta 20mg — black pen with silver label and clear cartridge

Retatrutide 20mg

$399
Fat loss · triple agonist In stock
the alt pen glow 80mg — black pen with silver label and blue cartridge

GLOW 80mg

$99
Skin + repair · BPC-157 · TB-500 · KPV · GHK-Cu In stock

The science was never the obstacle.
The workflow was.

Compounded vial vs the alt pen
Compounded vial workflow

What most researchers deal with today

  • Lyophilised powder + bacteriostatic water reconstitution
  • Insulin syringe draws + unit conversions every session
  • Storage and refrigeration of opened vials
  • Dosing inconsistency between sessions
  • Contamination risk every time the vial is pierced
the alt pen workflow

What arrives in the box

  • Pre-compounded sealed cartridge — the compound arrives mixed, inside the glass
  • Dial and dispense — graduated dial, no draws, no unit math
  • One pen body, every formulation — reusable hardware, swap the cartridge
  • Pharma-grade manufacturing — cGMP facility, certificate of analysis per lot
  • Independent university testing — every lot verified at POSTECH

Engineered for the bench, not the prep room.

The hardware
Cap — tamper-evident snap fit
Cartridge — sealed, pre-mixed, 3 mL
Body — reusable, matte blackthe alt pen.
Dial — graduated dispense
the alt pen · reusable dose pen

Uncap. Dial. Done.

The pen is built around a sealed, pre-compounded cartridge and a graduated dial. There is no reconstitution protocol, no syringe math, no exposure of the compound outside the cartridge — the strength on the label is the strength in the glass, and the lot on the label ties to the batch record.

Fill volume3 mL per cartridge
Units300 per pen
HardwareReusable black body
Cartridge swapOne motion, tool-free
Storage2–8 °C refrigerated
LabelLot + dose on-barrel
three alt pens standing on concrete
Quality

Independently tested by a university laboratory. Every lot.

Cartridges are manufactured and tested to pharmaceutical-grade standards. Each production lot carries a certificate of analysis issued through independent testing at Pohang University of Science and Technology [POSTECH].

Purity99.636% HPLC-UV · ≥97% acceptance criterion
Endotoxin<10 EU/mg · LAL method
Microbial<10 CFU · bacteria, mold + yeast
Challenge30-day, 5 organisms — pass · sealed-cartridge use window
RecordsLot-linked COA on file · printed lot on every pen
Same-day dispatch before 2 PM PT · ships from Los Angeles

Pick a pen. The rest is already done.

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