Tirzepatide 20mg Vial: Specifications, Reconstitution, and Storage
Reviewed by the VendPeptides Editorial Team. Written from product labeling, the batch certificate of analysis and published literature. Last updated September 2026.
The Tirzepatide 20mg Vial is a lyophilized research peptide supplied as a single 20 mg vial of tirzepatide for laboratory use only.
Tirzepatide has been studied in published research as a dual GIP and GLP-1 receptor agonist, including the SURMOUNT-1 phase 3 trial reported in NEJM in 2022.
It is also known by the code name LY3298176 and the brand names Mounjaro and Zepbound, and VendPeptides sells it in 5 mg, 10 mg, 15 mg, 20 mg, 30 mg, 40 mg, 50 mg, and 60 mg vials.
This guide covers what the Tirzepatide 20mg Vial is, reconstitution math by vial size, safe laboratory handling, storage, and where to buy it.
What is Tirzepatide 20mg Vial?
The Tirzepatide 20mg Vial is a single glass vial containing 20 mg of lyophilized tirzepatide, a synthetic dual GIP/GLP-1 receptor agonist peptide with CAS number 2023788-19-2.
It is sold strictly as a research chemical. For research purposes only. Not for human consumption.
Tirzepatide has been studied in published literature, including the SURMOUNT-1 trial, as a dual incretin receptor agonist. The vial label and the batch certificate of analysis (COA) are the authoritative sources for identity, purity, and mass.
The 20 mg size is one of eight single-vial strengths offered; each strength uses the same lyophilized peptide and differs only in fill mass.
Tirzepatide 20mg Vial, LY3298176 and Mounjaro: are they the same?
Yes. LY3298176 is the research code name for tirzepatide, and Mounjaro and Zepbound are the brand names used for approved drug products containing the same active molecule.
The distinction is regulatory, not chemical. A Tirzepatide 20mg Vial sold for research is not approved for any medical or veterinary purpose, while the brand-name products are approved drug products with their own labeling.
For laboratory work, the vial label and the batch certificate of analysis (COA) should be treated as the primary identity documents for the material in hand.
What has Tirzepatide 20mg Vial been studied for?
Tirzepatide has been studied in published research as a dual GIP/GLP-1 receptor agonist, and the SURMOUNT-1 phase 3 trial reported in NEJM in 2022 examined it in that context.
The product as sold by VendPeptides is a research chemical. It is not approved for any medical or veterinary purpose, and it is not for human consumption.
For research purposes only. Not for human consumption. Any laboratory use should follow the published literature, the vial label, and the batch certificate of analysis (COA) rather than marketing material.
Tirzepatide 20mg Vial reconstitution and concentration by vial size
Adding 2 mL (2,000 µL) of bacteriostatic water to a 20 mg vial gives 10 mg/mL.
| Vial size | 10-vial kit total | Diluent added | Resulting concentration | µg per µL |
|---|---|---|---|---|
| 5 mg | 50 mg | 1 mL (1,000 µL) | 5 mg/mL | 5 µg/µL |
| 10 mg | 100 mg | 2 mL (2,000 µL) | 5 mg/mL | 5 µg/µL |
| 15 mg | 150 mg | 3 mL (3,000 µL) | 5 mg/mL | 5 µg/µL |
| 20 mg | 200 mg | 2 mL (2,000 µL) | 10 mg/mL | 10 µg/µL |
| 30 mg | 300 mg | 3 mL (3,000 µL) | 10 mg/mL | 10 µg/µL |
The vial label and the batch certificate of analysis (COA) take priority over any table when they disagree.
Tirzepatide 20mg Vial 10mg vial reconstitution
Adding 2 mL (2,000 µL) of bacteriostatic water to a 10 mg vial gives 5 mg/mL, or 5 µg/µL.
This is laboratory concentration math only. For research purposes only. Not for human consumption.
Record the diluent volume and lot on the vial label, and check the batch certificate of analysis (COA) for the actual fill mass before calculating.
Tirzepatide 20mg Vial 5mg vial reconstitution
Adding 1 mL (1,000 µL) of bacteriostatic water to a 5 mg vial gives 5 mg/mL, or 5 µg/µL.
Smaller vials are convenient when a laboratory wants a smaller total mass per reconstituted vial. For research purposes only. Not for human consumption.
Confirm the fill mass on the vial label and the batch certificate of analysis (COA) before calculating concentration.
How long does reconstituted Tirzepatide 20mg Vial stay stable?
There is no single stability figure that applies to every laboratory; storage temperature, diluent, and handling all affect the outcome.
Published literature and the batch certificate of analysis (COA) are the appropriate references, and the vial label should be checked for any product-specific guidance.
For research purposes only. Not for human consumption. Record reconstitution date and storage conditions in the laboratory notebook.
How to handle Tirzepatide 20mg Vial safely in the laboratory
- Read the vial label and the batch certificate of analysis (COA) before opening the vial.
- Work in a clean, designated laboratory area with appropriate personal protective equipment.
- Use sterile technique and dedicated laboratory tools when adding diluent.
- Add the chosen diluent volume slowly down the inside wall of the vial to avoid foaming.
- Swirl gently until the lyophilized powder is fully dissolved; do not shake.
- Label the reconstituted vial with the concentration, date, and lot number.
- Store the vial according to the label and the batch certificate of analysis (COA).
Warning: Contamination, poor sterile technique, and unlabeled vials are the most common sources of laboratory error, so label every vial and follow the COA.
Is Tirzepatide 20mg Vial the same as Retatrutide?
No. Tirzepatide is a dual GIP/GLP-1 receptor agonist, while retatrutide is a different molecule studied as a triple receptor agonist.
They are separate compounds with separate CAS numbers, separate certificates of analysis, and separate research literature.
For research purposes only. Not for human consumption. Use the vial label and the batch certificate of analysis (COA) to confirm which compound is in hand.
Is Tirzepatide 20mg Vial safe for humans?
No. The Tirzepatide 20mg Vial is sold for research purposes only, is not for human consumption, and is not approved for any medical or veterinary purpose.
FDA guidance on research chemicals and 'not for human consumption' labeling applies to materials sold this way.
For research purposes only. Not for human consumption. Any human health question should be directed to a licensed healthcare professional.
Can Tirzepatide 20mg Vial be used for pets or animals?
No. The Tirzepatide 20mg Vial is a research chemical, is not a veterinary product, and is not approved for any medical or veterinary purpose.
For research purposes only. Not for human consumption. Any animal health question should be directed to a licensed veterinarian.
Laboratory animal work, where permitted, is governed by institutional and regulatory oversight rather than by the product listing.
Where to buy Tirzepatide 20mg Vial (5 mg, 10 mg, 15 mg, 20 mg, 30 mg, 40 mg, 50 mg, 60 mg)
VendPeptides supplies the Tirzepatide 20mg Vial and seven other single-vial strengths from a US warehouse, with a batch certificate of analysis (COA) and expiry on every label.
The 20 mg vial is listed at $95.00, and the full range runs from the 5 mg vial at $36.00 to the 60 mg vial at $245.00.
Related research materials include Metabolic Research Peptides, BPC-157, and the Tirzepatide Single Vial listing.
For research purposes only. Not for human consumption.
Frequently asked questions
Is Tirzepatide 20mg Vial safe for humans?
No. It is sold for research purposes only, is not for human consumption, and is not approved for any medical or veterinary purpose.
Is Tirzepatide 20mg Vial the same as Retatrutide?
No. Tirzepatide is a dual GIP/GLP-1 receptor agonist, while retatrutide is a different molecule studied as a triple receptor agonist.
How do I reconstitute a Tirzepatide 20mg Vial 10mg vial?
Adding 2 mL (2,000 µL) of bacteriostatic water to a 10 mg vial gives 5 mg/mL, or 5 µg/µL. This is laboratory concentration math only; for research purposes only, not for human consumption.
Can Tirzepatide 20mg Vial be used for pets or animals?
No. It is a research chemical, not a veterinary product, and is not approved for any medical or veterinary purpose. Consult a licensed veterinarian for any animal health question.
Is Tirzepatide 20mg Vial the same as Mounjaro or Zepbound?
The active molecule is the same, but the research vial is not approved for any medical or veterinary purpose, while Mounjaro and Zepbound are approved drug products with their own labeling.
Is Tirzepatide 20mg Vial a peptide, and what class is it?
Yes. It is a synthetic peptide studied as a dual GIP/GLP-1 receptor agonist, also known by the code name LY3298176.
Can you still buy Tirzepatide 20mg Vial?
Yes, VendPeptides lists the 20 mg vial at $95.00 alongside 5 mg, 10 mg, 15 mg, 30 mg, 40 mg, 50 mg, and 60 mg strengths. For research purposes only; not for human consumption.
Sources and further reading
- Jastreboff AM et al. Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1). NEJM 2022.
- PubChem — Tirzepatide
- FDA — research chemicals and 'not for human consumption' labeling
Disclaimer. This article is educational and describes laboratory handling and published literature only. It is not medical or veterinary advice and is not a substitute for a licensed professional. For research purposes only. Not for human consumption. Products are sold to qualified researchers for in-vitro and laboratory research, are not approved drugs, foods, cosmetics or devices, and are not for human or animal use. This article was written with AI assistance and reviewed by a member of the VendPeptides Editorial Team.