Quick answer: how do you reconstitute BPC-157?
To reconstitute BPC-157, inject bacteriostatic water slowly down the inside wall of the powder vial, then let it dissolve on its own without shaking. A common ratio is 2ml of bacteriostatic water into a 5mg vial, which gives a concentration of 2.5mg per ml, or 250mcg per 0.1ml on an insulin syringe. For a 4mg vial, 2ml of water gives 2mg per ml.
BPC-157 is a research peptide that is not FDA-approved for human use, and its compounding status has shifted between 2023 and 2026 (see the legal section below). This guide is educational. See the semaglutide page.
What you need to reconstitute BPC-157
You need the BPC-157 vial (lyophilized powder), bacteriostatic water, alcohol swabs, and an insulin syringe. Reconstitution means mixing the freeze-dried peptide powder with liquid so it forms a measurable solution.
Use bacteriostatic water, not tap or sterile water, when the vial will be stored and used more than once. Bacteriostatic water contains 0.9% benzyl alcohol, a preservative that limits bacterial growth in a multi-use vial. Sterile water has no preservative and is meant for single use only.
What is BPC-157 and why does it need reconstitution?
BPC-157 is a synthetic peptide studied mostly in animals for tissue repair. It ships as a lyophilized, or freeze-dried, powder because the dry form is more stable for storage and shipping. Before it can be measured, it has to be dissolved into liquid.
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Start Free Assessment →Reconstitution turns the powder into a solution of a known strength. The strength depends entirely on how much water you add, which is why the math matters and why labels alone do not tell you the concentration.
Step-by-step BPC-157 reconstitution
- Wipe the stoppers of both the BPC-157 vial and the bacteriostatic water vial with an alcohol swab and let them dry.
- Draw your chosen amount of bacteriostatic water into a clean insulin syringe.
- Insert the needle into the BPC-157 vial at a slight angle and push the water slowly down the inside wall of the vial, not directly onto the powder.
- Remove the syringe and let the powder dissolve on its own. Do not shake. Gentle swirling is fine if needed.
- Once the solution is clear and colorless, it is reconstituted. Discard it if you see particles, cloudiness, or color. Store as directed below.
Shaking can damage the peptide and create foam, so always let it dissolve passively.
How much bacteriostatic water for a 5mg BPC-157 vial?
For a 5mg BPC-157 vial, 2ml of bacteriostatic water gives a concentration of 2.5mg per ml, which is a common and easy-to-measure mix. On an insulin syringe that is 250mcg per 0.1ml (10 units). Adding 1ml instead gives 5mg per ml, and adding 5ml gives 1mg per ml.
The amount of powder never changes, only the concentration. More water means a lower concentration per ml and finer measurement on a syringe. Less water means a higher concentration and smaller injection volumes.
How much water for a 4mg BPC-157 vial?
For a 4mg BPC-157 vial, 2ml of bacteriostatic water gives 2mg per ml. Using 1ml gives 4mg per ml, and using 4ml gives 1mg per ml. The "4mg how to reconstitute with water" question that comes up often comes down to picking the water volume that makes your target measurement easy to draw.
The rule is the same for any vial size: concentration equals the milligrams of peptide divided by the milliliters of water you add.
BPC-157 concentration reference
| Vial size | Water added | Concentration |
|---|---|---|
| 5mg | 1ml | 5.0 mg/ml |
| 5mg | 2ml | 2.5 mg/ml |
| 5mg | 5ml | 1.0 mg/ml |
| 4mg | 1ml | 4.0 mg/ml |
| 4mg | 2ml | 2.0 mg/ml |
| 4mg | 4ml | 1.0 mg/ml |
This table shows concentration only. It is not a dosing recommendation, because BPC-157 is not approved for human use.
How do you store reconstituted BPC-157?
Once reconstituted, BPC-157 should be kept refrigerated, generally between 36 and 46 degrees Fahrenheit, and protected from light. Reconstituting with bacteriostatic water rather than plain sterile water extends how long a multi-use vial stays usable because of the preservative, often a few weeks refrigerated. Sterile water solutions should be used within a day or two.
The freeze-dried powder, before reconstitution, is more stable and is often stored frozen for long-term keeping. After mixing, treat it as a perishable liquid and never refreeze it, since ice crystals can damage the peptide.
Is BPC-157 legal and FDA-approved?
No, BPC-157 is not FDA-approved for human use, and its compounding status has changed recently. In late 2023 the FDA placed BPC-157 in Category 2 of its review of bulk drug substances used in compounding, a category for substances with significant safety concerns, which barred legal compounding. On February 27, 2026, HHS announced that roughly 14 of the 19 peptides previously placed in Category 2, with BPC-157 expected to be among them, would move back toward Category 1, which could again let licensed compounding pharmacies prepare it for patients with a valid prescription.
Because this status is in flux and the human evidence is limited, this guide is educational and not an endorsement of personal use. Much BPC-157 on the market is still sold labeled "for research use only." For an FDA-regulated path to a prescription compounded medication, FormBlends connects you with licensed providers for semaglutide and tirzepatide.
FAQ
How much bacteriostatic water do I add to BPC-157? It depends on the concentration you want. For a 5mg vial, 2ml gives 2.5mg/ml (250mcg per 0.1ml); for a 4mg vial, 2ml gives 2mg/ml. Concentration equals milligrams divided by milliliters of water.
Can I use regular or sterile water to reconstitute BPC-157? Sterile water works only for single use because it has no preservative. For a vial you will use more than once, bacteriostatic water is the standard choice because its benzyl alcohol limits bacterial growth.
Should I shake BPC-157 to dissolve it? No. Inject the water slowly down the vial wall and let the powder dissolve on its own. Shaking can damage the peptide and create foam.
How do I calculate BPC-157 dosage after reconstitution? First find the concentration (mg per ml), then divide your target amount by that concentration to get the volume to draw. An insulin syringe makes small volumes easier to measure. This is calculation only, not a dosing recommendation.
How long does reconstituted BPC-157 last? Keep it refrigerated and out of light, and follow the supplier's stated stability window. Bacteriostatic water extends usable life in a multi-use vial compared with plain sterile water.
Is BPC-157 FDA-approved? No. It is not approved for human use. It was barred from compounding under the FDA's 2023 Category 2 listing, and in February 2026 HHS announced a shift that could return it toward Category 1. Status is changing, so confirm current rules before acting.
Does FormBlends sell BPC-157? No. It connects you with licensed providers for FDA-regulated compounded semaglutide and tirzepatide.
Sources
- FDA, "Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks" (Category 2): https://www.fda.gov/drugs/human-drug-compounding/certain-bulk-drug-substances-use-compounding-may-present-significant-safety-risks
- PBS NewsHour, "FDA to weigh easing limits on unproven peptides" (2026 Category reclassification coverage): https://www.pbs.org/newshour/health/fda-to-weigh-easing-limits-on-unproven-peptides-favored-by-rfk-jr-and-maha-supporters
- USADA, "BPC-157: Experimental Peptide Creates Risk for Athletes": https://www.usada.org/spirit-of-sport/bpc-157-peptide-prohibited/
- Operation Supplement Safety (DoD), BPC-157 prohibited peptide and unapproved drug: https://www.opss.org/article/bpc-157-prohibited-peptide-and-unapproved-drug-found-health-and-wellness-products
- USP guidance on bacteriostatic water for injection and preservatives: https://www.usp.org/