Quick answer: This site publishes no BPC-157 or TB-500 dosage calculator, and as of 2026-10-09 no FDA-approved drug contains either compound. A calculator does arithmetic on one number that nobody has established: the amount a person should take. Its other inputs depend on a product label that no regulator has checked. This page explains what calculators assume, what the sources say about quantity errors, and what a trustworthy tool would require.
Search results for "BPC-157 TB-500 dosage calculator" show tools that promise an answer in seconds. Before building or using any of them, it helps to know what they are doing and what they leave out. This page describes calculators in general terms only, with no worked example and no figures.
What a calculator does, in general terms
A peptide calculator is a unit converter with a few boxes. It takes the amount of peptide that a container is labeled as holding, the amount of liquid that is said to be added to it, and the amount a person intends to receive. From those it reports a volume. Underneath, it is multiplication and division on three inputs.
Two of the inputs come from the container and the user. The third, the intended amount, has to come from somewhere else, and for these two compounds nothing supplies it. We explain why in the main dosage explanation. A calculator can only be as sound as its least certain input, and here that input is a guess carried over from a forum, a clinic page or an animal study.
A calculator also has a built-in blind spot: it cannot see the container. It trusts the label. Whether a label is accurate is a separate question, and how to read a peptide label and certificate of analysis covers what such documents can and cannot prove.
Why quantity and unit errors matter
Quantity errors deserve a careful reading of what the sources do and do not say. We looked for an FDA statement that names unit or concentration mix-ups as a harm specifically for BPC-157 or TB-500, and we did not find one in the material we reviewed. We do not claim one. What the sources support is narrower:
- Units differ by large factors. Milligrams and micrograms differ by a factor of one thousand, so a slip between them is not a small mistake. This is arithmetic, not a finding from a study.
- Reviews list inaccurate dosing as a risk. A 2026 article in Missouri Medicine lists "inaccurate dosing" with product contamination and manufacturing impurities among the severe potential risks of unapproved peptides such as BPC-157 and TB-500 (PMID 42757290). The abstract gives the list as a general risk statement and no incident counts.
- No standard preparation exists. A 2026 review in Pharmaceutics notes that none of the human pilot studies of BPC-157 used standardized pharmaceutical preparations (PMID 42198317). A calculated volume means nothing if the contents of the container are uncertain.
- FDA does not check compounded products before sale. FDA's compounding Q&A page, current as of 2025-09-16, states that compounded drugs are not checked by the agency for safety, effectiveness or quality ahead of marketing.
FDA has also commented on calculators themselves, though not in the way the search results suggest. In a warning letter posted 2026-08-24 to an online seller of other peptides, FDA said that a "peptide calculator" offered next to a diluent product "provides the means to prepare an injectable drug for human administration." That letter concerns different peptides and does not name BPC-157 or TB-500. Its relevance here is that, in that letter, FDA read a calculator as evidence that a product is intended for human use, whatever the label says. It is not a statement about arithmetic errors. As of 2026-10-09 we found no other FDA statement on calculators.
What the calculators in circulation assume
Without naming any, we can describe the assumptions a typical online calculator builds in. We have not tested any of them, and these are descriptions of the design, not findings about particular sites.
- The label is right. The tool trusts that the container holds the stated amount of the stated substance. For TB-500, whether the contents are a fragment or the whole protein is itself unsettled (see TB-500 and BPC-157 side effects for what is documented about harms).
- The target amount is known. This is the input no source can supply. A tool that asks for it is asking the user to bring a number from somewhere else.
- The user can measure accurately. A volume far smaller than a common household measure demands equipment designed for it, and a reading error scales directly into the amount received.
- The calculation matches the route. The tools usually presume injection. FDA's BPC-157 briefing found no human pharmacokinetic data for oral, subcutaneous, nasal or transdermal use, so the route is another unknown. The oral forms page covers what is known there.
- Every vial in a blend is the same. A mixed vial has more than one ingredient, and its label may state a total, not each part. The blend page shows what a blend label can prove.
Why this site publishes none
A calculator on this site would imply that an appropriate amount exists and that we know it. Neither is true. The FDA briefing documents say the risks of TB-500 in humans are unknown and describe BPC-157 as having insufficient clinical safety information. We would be adding the look of precision to something the evidence cannot support.
For the same reason, we do not publish a dosing chart. A figure with decimal places is not more reliable than the study it came from, and here there is no study.
What a safe calculator would require
A tool that deserved trust would need all of the following. None exists today for these compounds.
- A defined, characterized product, with a regulator-reviewed label stating strength and identity.
- A human dose established in controlled studies, for the specific route and population.
- Inputs fixed to that label, so a user cannot enter a figure copied from elsewhere.
- Built-in checks that refuse results outside the range a trial tested.
- Independent testing of the tool, including of its unit handling, by someone with no interest in the product.
- Clear scope: the tool says what it covers and refuses what it does not.
- Updates tied to the label, with a visible date.
Compare this with an approved medicine, where much of this work is done before the product reaches a pharmacy shelf. A licensed clinician or pharmacist can work through any arithmetic that a real prescription requires, with the patient's records in front of them. For a wider tour of the topic, see the Wolverine stack guide or return to the home page.
Sources
- FDA: Compounding and the FDA, questions and answers page current as of 2025-09-16, read 2026-10-09
- FDA briefing document: BPC-157 read 2026-10-09
- FDA briefing document: TB-500 read 2026-10-09
- FDA: warning letters index, letter posted 2026-08-24 (MARCS-CMS 733652) read 2026-10-09
- Mateescu et al. 2026, Pharmaceutics PMID 42198317
- Missouri Medicine 2026 review of injectable peptides PMID 42757290
FAQ
Why not publish a calculator and let readers decide?
A calculator makes a figure look checked. Because no human dose is established, the output would carry authority the evidence cannot support. We prefer to show where the evidence stops.
Are the calculators online accurate?
Their arithmetic may be correct. Whether the answer means anything depends on three things the tool cannot check: the contents of the container, the amount entered and the route. We have not tested any calculator.
Does FDA say unit mix-ups are a danger for these peptides?
We could not source an FDA statement that says so for BPC-157 or TB-500, so we do not claim one. A 2026 review lists inaccurate dosing among general risks of unapproved peptides.
What did FDA say about calculators in its warning letter?
In a letter posted 2026-08-24 about other peptides, FDA said a calculator offered alongside a diluent product provides the means to prepare an injectable drug for human administration. FDA read the calculator as evidence of intended use.
Who can check a real prescription calculation?
A licensed pharmacist or clinician can, using the label of an approved product and the patient's records. That option does not exist for these two compounds because there is no approved product.
Where is the current FDA position?
FDA's bulk drug substances page and its July 2026 advisory committee page. As of 2026-10-09 we found no final FDA decision on listing either substance.
Not medical advice. See the medical disclaimer.
