Peptides: What It Is, FDA Status & Reconstitution Math
By James Li, Lead Editor · Updated · Reviewed
Quick answer
A peptide is a short chain of amino acids, and the word covers many different substances, some of which are FDA-approved peptide drugs while many names people look up are not.
What they share here is the mixing math. Once you have milligrams on the label and the milliliters of water you added, concentration is those milligrams divided by those milliliters, and a U-100 syringe reads that volume as 100 units per milliliter, so 10 units is 0.1 mL while one milligram is 1,000 micrograms.
Blends
Optional. Extra peptides are added to the vial total.
Waiting on Input
5 mg vial, 2 mL water, 250 mcg. Example only, not a dose.
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Illustrative arithmetic only, not a recommendation. The result for Peptides (general) uses only the numbers you type.
What is Peptides (general)?
A peptide is a short chain of amino acids, and the word is not the name of one product.
Each named peptide has its own label, strength, and approval status, and the shared part is the math, which is milligrams divided by milliliters and then that concentration turned into syringe units.
What is the FDA status of Peptides (general)?
Some peptide drugs are FDA-approved and some are not, so look up the specific name.
The calculator does not grant or remove an approval and only divides the milligrams you enter by the milliliters you enter, so check Drugs@FDA or DailyMed for the product name on your label.
How is Peptides (general) reconstituted?
Reconstitution means a measured volume of liquid, usually bacteriostatic water, was added to a dry vial of a peptide.
Concentration is the milligrams in the vial divided by the milliliters you added, doubling the water cuts the amount in each unit in half, and the calculator uses the volume you report rather than picking one for you.
How do you convert Peptides (general) mg to mcg and syringe units?
For a peptide, multiply milligrams by 1,000 to get micrograms.
That conversion does not produce a syringe mark, because units measure volume and you still divide the micrograms you want to measure by the micrograms in each milliliter.
How should Peptides (general) be stored?
Storage for a peptide is on its own label, covering temperature, light, and how long it may be kept after mixing.
An unopened bottle and a mixed vial are not the same case, so if the label is missing ask the pharmacist or clinician who supplied it rather than borrowing a rule from a different product.
Where can I find primary sources on Peptides (general)?
For the approval status of a peptide, start with Drugs@FDA and the product label on DailyMed.
Those are the places that say whether a named product is approved and what its label claims, and this page does not recap studies or change the calculator because of them.
Unit math
Illustrative arithmetic only. Not a dose. Barrel columns use a U-100 scale, 100 units per mL.
| Vial mg | Water mL | mg/mL | mcg/mL | mcg in 10 units |
|---|---|---|---|---|
| 20 | 2 | 10 | 10,000 | 1,000 |
| 5 | 1 | 5 | 5,000 | 500 |
| 10 | 2 | 5 | 5,000 | 500 |
| mL | 1 mL barrel (U-100 scale) | 0.5 mL barrel (U-100 scale) | 0.3 mL barrel (U-100 scale) |
|---|---|---|---|
| 0.05 | 5 | 5 | 5 |
| 0.1 | 10 | 10 | 10 |
| 0.25 | 25 | 25 | 25 |
| 0.5 | 50 | 50 | 50 (past barrel) |
| 1 | 100 | 100 (past barrel) | 100 (past barrel) |
FAQ
What do peptides do?
A peptide is a short chain of amino acids, and each named peptide is its own substance with its own label, while this calculator covers the mixing math rather than what a peptide does in the body.
Is Peptides (general) FDA approved?
Some peptide drugs are FDA-approved and some are not, so look up the specific name.
How do I use the Peptides (general) calculator?
Type the milligrams on the vial, the milliliters of water you added, and the amount you want to measure, and the syringe mark updates in the calculator.
What is BAC water?
BAC water is bacteriostatic water, which is sterile water with a preservative used to dissolve a dry vial, and the volume you add is what sets the concentration.
How many units are in 1 ml on a U-100 syringe?
On a U-100 syringe, 1 mL is 100 units, 0.5 mL is 50 units, and 0.1 mL is 10 units, provided the barrel is long enough to hold that volume.
Sources
- Drugs@FDA, FDA
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