20 mg
1 mL final volume20 mg/mL
1 mg = 5 U-100 units
Understand every number.
A practical guide to the quantities used in the calculator and the evidence shown in the research feed.
From powder to a documented solution.
Reconstitution means preparing a solution from a dry product using the liquid and procedure its instructions specify. In everyday terms, the powder is the ingredient, the liquid is the carrier, and concentration tells you how much ingredient is in each mL. This analogy explains the numbers, not how to prepare a medicine.
- Lyophilized
- Freeze-dried. It describes the product’s dry form; it does not tell you its diluent or dose.
- Diluent
- The liquid specified for preparation. Bacteriostatic water and sterile water are different products, and neither is a universal choice.
- Reconstituted
- Prepared according to that product’s instructions. Storage and the discard date may change once prepared.
AN INVENTED LABEL / THREE DIFFERENT NUMBERS
20 mgTotal compound mass
10 mg/mLMass in each mL
2 mLDocumented final volume
mg says how much compound. mL says how much liquid. mg/mL connects them. This fictional label is a math example.
Product instructions determine whether mixing is needed at all. For two examples of different requirements for the same peptide, see EGRIFTA WR and SV documentation →.
Choose a compound to open its research, documentation and calculator.
Milligrams and micrograms.
Mass describes the amount of material. One milligram (mg) equals 1,000 micrograms (mcg or µg). A 5 mg vial therefore contains 5,000 mcg. Changing the target unit in the calculator converts the value so the physical amount stays the same.
1 mg = 1,000 mcg
SAME AMOUNT, DIFFERENT UNIT
1milligrammg
1,000microgramsmcg
Like dollars and cents, these are two ways to count the same amount. Here, the conversion is 1,000 to 1.
The amount in a given volume.
Divide the mass by the final solution volume. For a mathematical example, 5 mg in a final volume of 2 mL gives 2.5 mg/mL. A target of 0.25 mg in that solution corresponds to 0.1 mL.
Concentration = mass ÷ final volume
Volume = target mass ÷ concentration
Volume = target mass ÷ concentration
SAME MASS, MORE OR LESS LIQUID
2.5 mg/mL
5 mg spread through 2 mL.
Each 1 mL contains 2.5 mg.
Like the same spoonful of drink mix in a small or large glass: more liquid makes a less concentrated mixture. The total mass stays at 5 mg.
Final solution volume is the total volume after preparation. It is not automatically identical to the amount of diluent added. This calculator does not specify a solvent, preparation method, stability, or storage conditions.
Water added and final volume.
100 U-100 scale units = 1 mL of added liquid. The calculator starts with 1 mL (100 U-100 units) of liquid added as an editable example. Use the amount actually added for your preparation. This default is not a product-specific mixing instruction. See BD’s syringe capacity reference ↗
The basic calculation uses liquid added as an estimate of total solution volume. It does not calculate the powder’s contribution to volume. The dry powder’s appearance or its peptide mass alone cannot tell us the final volume: the formulation can also contain other ingredients.
For example, the EGRIFTA WR label lists 11.6 mg of tesamorelin, 145 mg of hydroxypropyl betadex, and 43.5 mg of mannitol. It specifies 8 mg/mL after adding 1.3 mL of its supplied diluent. These numbers apply to that specific product, not every tesamorelin vial. Read the product’s prescribing information, sections 2.2 and 11 ↗
For a more precise calculation, use preparation information for the exact product. Enter a documented final solution volume under Advanced. If the exact product states a final concentration in mg/mL, choose “Use a documented concentration” in Advanced instead. That value directly determines the syringe volume. A peptide name alone does not establish either value.
For a mathematical example, 20 mg in an assumed final volume of 1 mL gives 20 mg/mL. That is a conditional calculation, not a measurement of what happens when a particular powder is dissolved.
SAME MASS / DIFFERENT FINAL VOLUME
20 mg
2 mL final volume10 mg/mL
1 mg = 10 U-100 units
Both examples have 20 theoretical 1 mg portions. More liquid changes the volume per portion, not the total compound mass. These are assumed final volumes, not mixing recommendations.
Concentration = vial mass ÷ final solution volume
Whole doses = floor(vial mass ÷ amount per dose)
Whole doses = floor(vial mass ÷ amount per dose)
When the dose is entered in mg, its theoretical count depends on vial mass and dose mass, not the mixing volume. The syringe reading does depend on concentration. Counts exclude handling losses and do not establish how long a preparation can be stored or used.
A scale is a way to show volume.
One milliliter is 1,000 microliters (µL). A U-100 syringe scale has 100 units per mL, so 10 scale units represent 0.1 mL. These scale units are separate from a compound’s biological activity units, such as IU. There is no general mass-to-IU conversion.
Syringe capacity changes the maximum displayed volume. It does not change the concentration. Graduation spacing describes the distance between markings; the calculator flags intermediate values and does not silently round them.
U-100 scale units = volume in mL × 100
U-100 SCALE · 1 mL CAPACITY100 units = 1 mL
10 units=0.1 mL=100 µL
Switching from mL to units is like reading another set of labels on a measuring cup. The liquid amount stays the same. Illustration only; U-100 units describe volume, not biological activity (IU).
Keep each component separate.
A blend’s total mass alone does not tell you the mass of each component. Enter both documented component masses and choose which component the target refers to. The result shows the mass of both components in the same calculated volume.
TWO COMPONENTS, ONE SHARED VOLUME
Component A5 mg in the vial
Component B2 mg in the vial
In a final volume of 2 mL
0.25 mg Ain a 0.1 mL portion
0.1 mg Bin that same portion
Like two ingredients mixed into one drink, both come along in every portion. In this example, the A-to-B ratio stays 5:2. A blend name alone does not tell you that ratio.
Theoretical portion counts exclude transfer loss, device dead space, overfill allowances and product-specific usable-dose limits. Remaining volume is a mathematical estimate, not a guarantee of recoverable material.
A study label is only the beginning.
A clinical trial, laboratory study, review, and preprint answer different questions. Check the population or experimental model, comparison group, sample size, measured outcomes, limitations, and conflicts of interest. A positive laboratory result alone does not establish an effect in people.
DIFFERENT STUDIES, DIFFERENT QUESTIONS
Cells & laboratory
What happens in a controlled model? Results may not carry over to people.
Animal studies
How does it behave in an animal model? Species and study conditions matter.
Studies in people
What happened in the studied population? Look for comparisons and measured outcomes.
Reviews
What do multiple papers suggest together? Quality depends on the studies and methods.
A study type is a clue about the question being asked. It is not a quality score or a promise of benefit. A preprint is a publication status, and may not yet have been peer reviewed.
The feed displays publication types provided by PubMed. Read the original study to assess its quality and what the results mean.
Who shared it? How was it studied?
Independent researchers and medical practices can raise valuable questions and publish useful observations. The Community badge identifies where a source comes from. A separate evidence-type label describes what it contains. Origin does not establish quality, independence of funding or medical credentials.
Published clinic report
Original patient observations with a published method. Check sample size, comparison groups, measurements and limitations.
Clinic explainer
A practitioner or clinic’s explanation. Look for original data behind its claims and whether the clinic offers the service.
Vendor explainer
A seller’s description of a product or proposed use. A listing can explain a nickname or advertised ratio without proving a health benefit.
Community discussion
A forum post or self-report can raise questions and describe experiences. Credentials, product identity and measurements may be unverified; distinguish it from a published clinical dataset.
Ask whether the exact molecule, combination, route and population match the claim. Check named authors, methods, funding and commercial interests. A testimonial, a plausible mechanism and a controlled trial offer different kinds of evidence. Inclusion on this site is not an endorsement or a personal treatment plan.
Explore a worked example: the Wolverine Stack →Compare a community schedule with trial evidence: Tesamorelin →
The details that make a difference.
Is bacteriostatic water always the right liquid?
No. Use the compatible diluent specified for the exact medicine. For example, EGRIFTA WR specifies supplied bacteriostatic water, while EGRIFTA SV specifies supplied sterile water. A peptide’s name cannot choose the diluent.
Compare those product documents →Is a 20 mg label the same as 20 mg/mL?
No. 20 mg describes a mass. 20 mg/mL describes a concentration. A concentration needs both the compound amount and the final liquid volume, or a product-specific documented concentration.
Does adding water increase the peptide amount?
No. It spreads the same compound mass through more liquid. In the comparison above, the theoretical number of 1 mg portions stays the same while the syringe reading changes.
Are syringe capacity and its smallest marking the same thing?
No. Capacity is the maximum volume: 1 mL corresponds to 100 U-100 units. Graduation is the spacing between lines, which can differ between devices of the same capacity. Check the actual device; a smaller barrel is not automatically a different concentration scale.
What if the result is between syringe markings?
The calculator flags it and keeps the unrounded arithmetic. It cannot establish whether your device can measure the amount accurately. Ask your pharmacist or clinician about a suitable prescribed preparation and measuring device.
Does “20 doses” mean the vial lasts 20 days?
No. The calculator counts theoretical portions of an entered mass. It does not choose frequency or duration, account for handling losses, or override single-use and discard instructions. A product’s labeled usable doses can be fewer than simple mass division suggests.
Can I refrigerate every mixed vial or keep it for 28 days?
No. Use the product’s temperature and discard instructions. A diluent bottle’s date is separate from the prepared medicine’s date. EGRIFTA WR and SV illustrate why a universal refrigerator or 28-day rule would be misleading.
See formulation-specific instructions →Where can I learn about giving an injection?
Start with training from your doctor, nurse or pharmacist for your prescribed product and device. Our illustrated page explains subcutaneous concepts, site preparation and safe disposal with links to original patient guidance.
Open the visual injection guide →Transparent inputs. Original sources.
Compound guides label community-derived citations with a Community badge and a source type. Entries include attribution, an editorial check date, limitations and known commercial relationships. Published practitioner research remains distinguishable from clinic explanations, vendor material and forum discussions. Coverage is added source by source; we do not certify independence or label marketing as an original study.
Calculations use the entered mass and either liquid added as an estimated final volume a documented final volume, or a documented mg/mL concentration from Advanced. The concentration option does not infer a measured or recoverable fill volume. Display values are rounded for readability; arithmetic uses unrounded values. Compound names organize calculations and do not choose quantities or recommendations.
The research feed uses PubMed’s E-utilities API to retrieve 18 recent records across a defined set of compound names. Successful responses are cached for 30 minutes. Searches and filters on the research page apply to those retrieved records, not the entire PubMed database. If PubMed is temporarily unavailable, the feed labels any previously retrieved records it shows.
Saved calculations stay in this browser on this device and can be removed individually. They do not synchronize between devices. Light, dark, and system theme preferences are also remembered in this browser when storage is available.