Peptide Dosage Calculator

New to peptide research in Australia? Start with our peptide information hub for guides on every research peptide we stock.

Reconstitution is the process of mixing a lyophilised (freeze-dried) research peptide — whether that's BPC-157, TB-500, or a multi-peptide blend like GLOW or KLOW — with bacteriostatic water to create a liquid solution that can be measured and drawn into a syringe.

Three numbers determine everything: how many milligrams (mg) of peptide are in the vial, how many millilitres (mL) of water you add, and how many micrograms (mcg) you want in a single dose. Once you know those, this calculator works out the concentration of your mixed solution, exactly how far to draw the syringe plunger, and how many full doses you'll get from the vial.

1. Check your vial and target dose. Confirm the total milligrams (mg) of peptide in your vial (printed on the label) and decide on your target dose in micrograms (mcg) before you reconstitute anything.
2. Add bacteriostatic water. Draw your chosen volume of bacteriostatic water into a syringe and inject it into the vial, aiming the needle at the inside wall of the vial rather than directly onto the peptide powder.
3. Dissolve the peptide. Gently swirl or roll the vial between your hands until the powder fully dissolves. Don't shake it - vigorous agitation can damage the peptide structure.
4. Draw your dose. Use the calculator above to find the exact unit mark on your syringe for your chosen dose, based on the concentration you've just created.

As a general rule, adding more water gives a more diluted solution and a larger draw volume per dose — useful if you want finer control over small doses. Adding less water gives a more concentrated solution and a smaller draw volume. For a deeper walkthrough, see our peptide reconstitution guide.

Every PhaseOne peptide is independently HPLC-tested for purity — see our HPLC testing guide and browse the full COA library before you order.

This calculator is provided for research and educational purposes only. All PhaseOne products are intended strictly for laboratory research and are not for human consumption.

• Confusing milligrams (mg) and micrograms (mcg). Most peptide doses are measured in mcg, while vials are typically labelled in mg. A decimal point in the wrong place can mean a 1000x error.
• Reading the wrong syringe scale. Insulin syringes are marked in "units," not mL. Always confirm which syringe size (0.3mL/30u, 0.5mL/50u or 1mL/100u) you're using before drawing.
• Changing the water volume without recalculating. If you reconstitute with more or less bacteriostatic water than planned, the concentration changes and your previous draw volume no longer applies.
• Assuming every peptide in a blend doses equally. In multi-peptide blends — including popular combinations like GLOW (70mg), KLOW (80mg) and our BPC-157 + TB-500 blend — each peptide can have a different mg content, so the draw volume can differ between peptides even in the same syringe pull. Use the "Peptide blends" tab above to calculate each one correctly.
• Ignoring dead space in the syringe. A small amount of solution can remain in the needle and hub after drawing, which matters more for very small doses.
• Storing reconstituted peptides incorrectly. Once mixed with water, most peptides should be refrigerated and used within their documented timeframe — see our peptide storage guide for details.

Bacteriostatic water is sterile water containing a small amount of benzyl alcohol, which helps inhibit bacterial growth so a reconstituted vial can be used across multiple draws rather than once. It's the standard diluent used for reconstituting lyophilised research peptides across Australia. Read our full bacteriostatic water guide, or shop bacteriostatic water directly.

Syringe size depends on your draw volume. A 0.3mL (30 unit) syringe gives the finest precision for small draw volumes, while 0.5mL (50 unit) and 1mL (100 unit) syringes suit larger volumes. The calculator above shows the exact unit mark to draw to for whichever syringe you select.

It changes the volume needed to deliver the same dose, not the total amount of peptide in the vial. More water means a more dilute solution, so you draw a larger volume to get the same mcg dose, and vice versa with less water.

Yes. The "Peptide blends" tab calculates reconstitution and draw volume for each peptide in a blend individually, since popular Australian blends like GLOW (70mg) and KLOW (80mg) combine multiple peptides in different mg ratios. Shop GLOW (70mg) or KLOW (80mg) directly, or browse our full range of research peptides for sale in Australia.

No. This tool is provided for research and educational purposes only, based on standard reconstitution mathematics. It does not constitute medical, dosing or clinical advice, and PhaseOne products are intended for laboratory research use only.