How to check the math when two vials share a syringe

1. Copy each compound and its amount from the label. A shared draw may list two or more names, and the label is the only place to get the amount for each. Write each amount separately in milligrams, because a total alone will not show how much of each compound a draw contains.
2. Write the water volume and convert it to units. One milliliter is 100 units on the syringe scale ¹. The total units come from the water volume in milliliters multiplied by 100. This becomes the number every component is divided by.

The test for any tool here is simple. If it does not let you enter each component separately, it cannot show what a draw contains for each one.

3. Keep the total liquid in units as the denominator (the number you divide by). In a shared draw, the total liquid does not change from component to component. The vial amount for each component changes, and its share changes, but the total units of liquid stay fixed until you add more water. A blend calculator should hold that denominator steady while it works through each row.

This is the part most single-vial checks hide. A one-vial result gives one concentration. A two-component result gives one concentration per row, all using the same total liquid.

On the web, ChatPEP's calculator can handle a vial that holds more than one compound ². It shows each component's share of the vial, how much of each is in one unit, and how much of each any draw contains ².

4. Enter each row's component and amount. Use the Component and In vial (mg) fields. On a narrow screen, those read Component and mg. If a row is missing, select Add component ².
5. Read the per-unit amount and the draw amount for each row. The result table shows Share, mcg / unit, and the column named after the draw, such as At 30 units ². Those two numbers should match your own division.

The calculator is a web feature. On iPhone, an answer about a blend shows a summary card, and the full breakdown opens on the web ². The message-box dose calculator works with one compound at a time ².

The numbers below only show arithmetic ². A vial holds 10 mg of Compound 1 and 5 mg of Compound 2, with 3 ml of water, which makes 300 units.

If you enter targets for two components that need different numbers of units, the calculator says so under the table, because a single draw cannot match both ².

• If you are using the iPhone app for a full blend breakdown, this is not for you yet. The iPhone summary card lists components, and the full breakdown opens on the web ².
• If you expect the calculator to choose or validate an amount, this is not for you. The calculator only does arithmetic on what you enter, and it does not suggest an amount ¹.
• If you are looking for a how-to on taking anything, this is not that tool. ChatPEP reports what studies did and does not turn a study dose into instructions ³.