FreePeptideCalc

Peptide Blend Calculator

Target one component and see what the same draw delivers for all the others.

Calculator inputs

Describe the blend

Target one component; the result shows everything delivered in that same draw.

BPC-157mg
TB-500mg

Enter the milligrams printed on your own label — blend ratios are not standardised.

One draw of
15units(0.15 mL)
15 units01020304050U-100 barrel · 50 units · read the leading edge of the black plunger seal
Draw to 15 units on a 50-unit U-100 syringe.

That single draw delivers

ComponentConcentrationPer injection
BPC-157targeted3.33 mg/mL500 mcg
TB-5003.33 mg/mL500 mcg
Components in a blend are fixed in ratio. Changing the dose of one changes all the others by the same proportion.

Why a blend has one dose, not two

A blend is not two drugs that happen to share a box. It is one solution containing two or more peptides, and once the water goes in there is no operation you can perform on that vial that changes their proportions. A syringe draws a volume. Every component present at some concentration comes along in that volume, at its own concentration, whether you wanted it or not.

That has three consequences worth stating plainly, because most blend pages skip all three:

  • You cannot titrate one component. Halving the draw halves both. If your reason for reaching for a blend was to adjust one of them, a blend is the wrong container for it.
  • Water does not help. Diluting further changes both concentrations by the same factor and leaves the ratio untouched. What it does change is where the draw lands on the barrel, which is worth doing when a blend puts your target at two or three units.
  • The ratio is the seller’s choice, not a standard. Blend names like KLOW are product names. There is no monograph behind them and no approved product, so the only authority on what is in your vial is the label on your vial.

The calculator above reflects that: you enter each component’s milligrams, aim at one of them, and it shows the volume, the syringe units, and what every other component delivers at that same volume.

What a blend label should tell you, and usually does not

The arithmetic on this page is only as good as the numbers you feed it, and blend labels are the weakest input on the site. Four things have to be on the label for a draw to be calculable at all:

  • The mass of each component separately, not a combined total. “10 mg blend” is ambiguous by a factor of two: it usually means 5 mg of each in a two-component vial, and sometimes means 10 mg of each. Nothing standardises it.
  • Which components are present, by name. Product names like KLOW are seller inventions with no monograph behind them, so the name alone does not fix the contents — two vials with the same name can hold different things.
  • The unit for each. Blends frequently mix scales, with one component in milligrams and another in micrograms. A number without its unit is a thousand-fold ambiguity.
  • Nothing about a dose. Where a blend label carries a suggested dose or a “protocol”, that figure has a vendor behind it rather than a study or a regulator, and none of the components in any blend here has an approved human dose in any country.

If your label gives only a total, you cannot recover the split, and no calculator can do it for you. That is not a limitation of this tool — it is missing information about the physical object, and the honest response is to treat the contents of the draw as unknown.

The evidence problem is separate from the arithmetic problem

Worth separating, because they get run together. The arithmetic above is exact: given the masses and the water volume, what a draw contains is a calculation with one answer.

The evidence is a different matter. No published study has tested any of these combinations as a combination. What exists is thin single-agent literature — one 2006 human study for CJC-1295 with DAC, one 1999 single-dose intravenous pharmacokinetic study for ipamorelin, and review-level literature for BPC-157 and TB-500 with no approved human dose behind any of it. A blend is therefore two or more unknowns sold as one product, with the additional property that you cannot separate them after the fact.

No blend on this site is an approved drug, and none of the combinations has been studied as a combination. The arithmetic here is exact. The question of whether any of these numbers is a dose is a different question, and for these compounds nobody has answered it.

Blends with their own page

Each one carries the regulatory status of every component, the evidence base, and the same calculator preloaded with the ratios that vial is usually sold in.

Holding a single-peptide vial instead? Every peptide calculator is here, and this guide explains what any of these tools can and cannot know.

Common questions

Sources used on this page

Every number on this page comes from one of the documents below. Where no reliable source exists, the page says so instead of filling the gap.

  1. RegulatorFDA· 2026-05-14
    Bulk Drug Substances Nominated for Use in Compounding Under Section 503A
  2. RegulatorFDA
    Certain Bulk Drug Substances for Use in Compounding May Present Significant Safety Risks
  3. RegulatorFDA· 2026-07
    July 23–24, 2026 Meeting of the Pharmacy Compounding Advisory Committee
  4. RegulatorFDA· 2024-10
    October 29, 2024 Meeting of the Pharmacy Compounding Advisory Committee
  5. RegulatorFDA· 2024-12-04
    PCAC briefing document — substance descriptions and 503A statutory conditions
  6. RegulatorFDA· 2026-08-24
    Warning Letter — Peak Performance Peptides (research-use-only labelling does not exempt an unapproved new drug)
  7. RegulatorFDA
    Compounding Risk Alerts
  8. Published studyJournal of Clinical Endocrinology & Metabolism· 2006
    Teichman SL et al. Prolonged stimulation of GH and IGF-I secretion by CJC-1295, a long-acting GHRH analog
  9. Published studyPharmaceutical Research· 1999
    Gobburu JVS et al. Pharmacokinetic-pharmacodynamic modeling of ipamorelin in healthy men
  10. Published studyPubMed Central
    Sikirić P et al. Stable gastric pentadecapeptide BPC 157 — a review of the rodent literature
  11. Published studyPubMed Central
    Thymosin beta-4 (RGN-259) phase 3 in neurotrophic keratopathy
  12. GuidelineInternational Organization for Standardization· 2016-03
    ISO 8537:2016 — Sterile single-use syringes, with or without needle, for insulin (scope and requirements; full text not public)