BPC-157

What BPC-157 is

BPC-157 stands for Body Protection Compound 157. It is a synthetic peptide made of 15 amino acids, based on a sequence identified within a larger protein present in human gastric juice. Because it is synthesised rather than extracted, what arrives in a vial is a manufactured chemical, and its purity depends entirely on who made it.

The compound has been studied in animal models since the 1990s, largely in the context of tissue repair. It has never completed a full human clinical development programme, and it is not an approved medicine anywhere in the US, EU or UK. A related molecule, PL 14736, was investigated as a treatment for inflammatory bowel disease and reached early-stage human trials, but development did not continue to approval.

How it is supplied and stored

BPC-157 is shipped as a lyophilised powder — freeze-dried into a small white pellet or a thin film at the bottom of a sealed glass vial. The vial is capped with a rubber stopper and an aluminium crimp. There is no liquid in it until you add some.

The label states the peptide mass in the vial, not a concentration, because the concentration does not exist until reconstitution. A vial labelled 5mg contains 5 mg of powder whether you later dissolve it in 1 mL or 5 mL of bacteriostatic water — what changes is how many micrograms end up in each syringe unit.

Storage in practice

• Before reconstitution: sealed lyophilised vials are the stable form. Most suppliers state refrigerated or freezer storage, away from light.
• After reconstitution: once water is added, the clock starts. Reconstituted peptide is refrigerated, and its usable window is far shorter than the dry powder's.
• Bacteriostatic water vs sterile water: bacteriostatic water contains 0.9% benzyl alcohol as a preservative, which is why it is used for multi-dose vials. Plain sterile water has no preservative and is single-use.
• Light and agitation: peptides are typically reconstituted by letting the stream of water run down the vial wall rather than shaking, and stored in the original vial rather than transferred.

See storing peptides and tracking expiry for how to record open dates and discard dates so a vial never quietly outlives its window.

The units you will meet

Three different units appear in the same workflow, which is the single most common source of logging errors:

1. Milligrams (mg) — on the vial label. This is the total peptide mass.
2. Micrograms (mcg) — how individual entries are usually recorded, because a typical entry is a small fraction of a milligram. 1 mg = 1,000 mcg.
3. Insulin syringe units (IU marks) — what you actually read off the barrel. On a U-100 insulin syringe, 100 units = 1 mL, so 1 unit = 0.01 mL. A unit is a volume, not an amount of peptide.

The arithmetic is simple and deterministic: concentration (mcg/mL) = vial mcg ÷ water mL, then volume (mL) = amount (mcg) ÷ concentration, then units = volume × 100. Our reconstitution calculator does exactly this and nothing more — it has no opinion about the number you enter.

What the research literature covers

Almost all published BPC-157 work is preclinical: rats and mice, plus cell-culture studies. Recurring themes in that literature include tendon and ligament healing models, gastrointestinal mucosal injury models, and effects on blood-vessel formation. Reviews of this body of work consistently note that the studies come from a small number of research groups and that human evidence is essentially absent.

Two practical consequences follow. First, there is no established human dosing, which is why no reputable source — including this one — will give you a number. Second, the safety profile in humans is genuinely unknown rather than merely under-documented; "no reported side effects" in a compound with no human trials means nobody has looked, not that nothing happens.

Regulators have engaged with the compound directly. In 2023 the US FDA categorised BPC-157 among bulk substances that raise significant safety concerns for use in compounded preparations, and several sport anti-doping bodies list it as prohibited. If you compete in a tested sport, check the current prohibited list rather than assuming.

Logging BPC-157 accurately

A record that is actually useful six months later contains more than a date and a number. The fields worth capturing:

• Vial identity — mg on the label, batch or lot number, supplier, and the date you reconstituted it. Two vials of the "same" compound are not interchangeable data points.
• Reconstitution volume — how much bacteriostatic water went in. Without it, every unit figure in your log is uninterpretable later.
• Amount per entry in mcg — the derived amount, not just the syringe marking.
• Injection site — rotated and recorded, so you can see a pattern rather than guess. See injection site rotation.
• Anything you noticed — good or bad, with a timestamp. Patterns only emerge from consistently recorded observations.

In PepCycle, BPC-157 is set up as a research-peptide compound: you enter the vial mg and the water volume once, and every subsequent entry converts between mcg, mL and syringe units automatically while the vial's remaining contents count down. Backdating an entry you forgot recalculates the vial correctly rather than leaving the maths stale.