Using the blend calculator.

A blend is more than one compound reconstituted in the same vial, so a single draw delivers all of them at once in a fixed ratio. The arithmetic is the same as for a single compound, repeated per component against one shared volume, which is exactly the kind of bookkeeping that goes wrong on paper.

How the calculation runs.

1. 01Enter each component and its quantity in the vial, taken from the labels.
2. 02Enter the total diluent volume you added once, because every component shares it.
3. 03The calculator derives a separate concentration for each component.
4. 04Enter a target for the component you are dosing by, and it reports the draw volume in U-100 units plus how much of every other component that same draw delivers.

That last line is the whole point. In a blend you cannot adjust one component independently. Changing the draw to hit a target for one compound changes the amount of everything else in the vial by the same proportion, and the ratio is fixed the moment the vial is mixed.

What the numbers cannot tell you.

• •Whether the components are chemically stable together in solution
• •Whether they remain stable for the period you intend to store the vial
• •Whether a combination has ever been studied in humans, which for most blends it has not
• •Whether the ratio makes any pharmacological sense

The calculator answers a measurement question and is silent on all of those. Most marketed blends have no published human data as a combination, even when the individual components do, and combining two compounds does not combine their evidence. Our stack pages work through the specific claims made for the common combinations, including the ones that do not hold up.

A practical note.

If you track a blend in the app, add it as a custom compound with the ratio described in its name, and log by the component you dose against. Keeping the blend as one record rather than several avoids double-counting inventory, since every component drains from the same vial.