Last updated: June 2026 · Reviewed June 2026 · Built by the InjectBuddy team

What is BPC-157? A plain-language guide

BPC-157 is a synthetic 15-amino-acid peptide derived from a protein found in human gastric juice, with all published evidence coming from preclinical animal and in-vitro studies — there is no FDA-approved human formulation and no clinically established dose. This guide explains what the molecule is, why it remains investigational, and the reconstitution arithmetic that converts a microgram figure into syringe units, answering the questions people ask most.

What BPC-157 actually is

BPC-157 (Body Protection Compound-157) is a stable partial sequence of a protein found in human gastric juice. The "157" refers to the fragment; the synthetic version sold as a research chemical is a 15-residue peptide — a pentadecapeptide. It ships as a lyophilised (freeze-dried) white powder in sealed glass vials, most often 5 mg or 10 mg, and must be dissolved in bacteriostatic water before it could ever be drawn into a syringe. It is never supplied pre-mixed.

Most of the published interest comes from rodent studies of gastrointestinal, tendon, and wound-healing outcomes — for example, a review of its proposed cytoprotective and vascular-recruitment mechanisms in the gut, and a cell-and-tendon study showing accelerated tendon outgrowth in culture and in rats. These are mechanistic, animal, and in-vitro findings.

Why this stays a maths reference, not a dosing protocol

Here is the honest caveat that runs through this whole page: BPC-157 is preclinical. A 2019 review of its musculoskeletal effects states plainly that the consistently positive healing results reported so far come from animal models and that human clinical trials are lacking. No regulator has approved a human dose, so there is no "standard 250 mcg" the way there is a standard semaglutide titration. Any microgram figure you see online is a community convention, not a validated prescription.

What we can do without overstepping is the arithmetic. Reconstitution maths is identical for any peptide: it does not assert that a dose is safe or effective — it only tells you how many units a given amount of solution occupies. That distinction is the whole point of this guide, and it is why this page is a calculator companion rather than a treatment plan. For the broader chemistry of these molecules, see what a peptide is.

mg on the label, mcg in the conversation

The single biggest source of confusion is unit mismatch. Vials are labelled in milligrams; doses are discussed in micrograms. The conversion never changes: 1 mg = 1,000 mcg. So a 5 mg vial holds 5,000 mcg of peptide and a 10 mg vial holds 10,000 mcg. A commonly quoted 250 mcg figure is therefore one-twentieth of a 5 mg vial — the vial size alone tells you nothing about your draw until you also know how much water went in.

How this is calculated

Every reconstitution problem is two divisions and one multiplication:

1. Concentration = total peptide (mcg) ÷ bacteriostatic water added (mL). This gives mcg per mL.
2. Draw volume = your dose (mcg) ÷ concentration (mcg/mL). This gives mL.
3. Syringe units = draw volume (mL) × 100, because a U-100 insulin syringe marks 100 units per mL.

Common BPC-157 doses to syringe units

The table below maps microgram figures discussed in the research-chemical community to draw volumes and U-100 units, all assuming a 5 mg vial reconstituted with 2 mL of BAC water (2,500 mcg/mL). These are unit conversions, not recommendations.

Notice the pattern: at this concentration, every 25 mcg equals exactly 1 unit. Re-water the vial differently and the whole column shifts — which is why the diagram below shows how concentration controls the draw.

Reconstitution arithmetic worked through

Each block below is a self-contained conversion you can check by hand. They cover different vial sizes, water volumes, and doses so you can see how the formula behaves.

Handling and storage notes

Bacteriostatic water is sterile water with roughly 0.9% benzyl alcohol, a preservative that lets a punctured multi-use vial resist bacterial growth — which is why it, not plain sterile water, is the standard diluent for a vial used over several weeks. Add water slowly down the vial wall rather than blasting the powder, swirl rather than shake, and expect a clear, colorless solution. Reconstituted vials are generally kept refrigerated at 2–8 °C and never frozen; discard if the solution turns cloudy or shows particles.

This guide does not constitute medical advice. BPC-157 is a preclinical research compound with no approved human dose; InjectBuddy is a mathematics tool for unit conversion only. Verify anything you do with a qualified prescriber.