If you have a 5mg vial in one hand and a bottle of BAC water in the other, the question isn't really "how much" — it's "how much makes my syringe reading clean." That's all the volume choice does. It changes concentration, not peptide content.
Open the Peptide Calculator → Enter vial strength, BAC water volume, and your target research amount.
What This Means in Simple Terms
The dry peptide in the vial is fixed. The BAC water you add is the variable. More water = more dilute, larger draws. Less water = more concentrated, smaller draws. You pick the volume that lands you on a tidy unit mark on a U-100 syringe.
What You Need Before You Calculate
- The vial strength printed on the label (e.g. 5mg, 10mg).
- A BAC water volume you're considering (1mL, 2mL, or 3mL are the common ones).
- A target research amount in mcg.
The Simple Formula
Concentration = vial mcg ÷ BAC water mL. That single line is the entire reason volume matters.
Practical Example — 5mg Vial
- 5mg + 1mL → 5,000mcg/mL → 50mcg per unit.
- 5mg + 2mL → 2,500mcg/mL → 25mcg per unit.
- 5mg + 3mL → ~1,667mcg/mL → ~16.6mcg per unit.
Practical Example — 10mg Vial
- 10mg + 1mL → 10,000mcg/mL → 100mcg per unit.
- 10mg + 2mL → 5,000mcg/mL → 50mcg per unit.
- 10mg + 3mL → ~3,333mcg/mL → ~33mcg per unit.
Same pattern every time: double the BAC water, halve the concentration. The peptide in the vial doesn't move.
Skip the math — run it in the Peptide Calculator and see the syringe reading instantly.
How to Pick a Volume
Aim for a draw that lands on a clean unit mark — not 7.3 units or 23.8 units. If 1mL gives a tiny draw, try 2mL. If 3mL gives a clumsy big draw, try 2mL. The calculator lets you flip between 1, 2, and 3 in seconds and pick the cleanest read.
Common Mistakes to Avoid
- Assuming every vial defaults to 2mL.
- Thinking more BAC water means more peptide. It doesn't.
- Switching BAC water volume mid-vial and forgetting to recalculate.
- Confusing mL marks with insulin unit marks on the syringe.
- Picking a volume that lands you on an awkward draw, then guessing.
When to Use the Peptide Calculator
Before you reconstitute. The whole point is to know which volume gives the cleanest syringe reading before the water hits the powder, not after.
FAQ
How much BAC water do you add to a 5mg peptide vial?
1mL or 2mL are the most common research calculations. 2mL is popular because draw volumes are easier to read.
How much BAC water for a 10mg vial?
1mL, 2mL, or 3mL are all valid. The calculator shows which gives the cleanest syringe reading for your target.
Is 1mL or 2mL better?
Neither. 1mL = smaller, more concentrated draw. 2mL = larger, more diluted draw. Pick the cleaner unit mark.
Does adding BAC water reduce the peptide?
No. Only the concentration changes. Total peptide stays the same.
What if I added the wrong amount?
You don't lose peptide. Recalculate the unit mark using the actual mL you added.
Can I top up BAC water later?
You can, but then the concentration changes again. Recalculate every time the liquid volume moves.
Open the Peptide Calculator and compare 1mL vs 2mL vs 3mL for your vial in seconds.