UK Peptide Reconstitution Calculator

What figures does the calculator give?

It returns four numbers, all resting on a single division. The concentration comes first, in milligrams per millilitre, the standard way to state a solution's strength. Second is the volume that contains the quantity typed into the third box. Third, that volume is restated as units on a U-100 barrel, the scale printed on nearly every syringe in use. Fourth come the micrograms per unit, useful to know because one unit is the finest step a barrel can mark.

Change one input and all four results update. The arithmetic runs on the page itself, so nothing you enter leaves your browser.

What is reconstitution?

Each vial ships as lyophilised powder. Lyophilisation is freeze drying carried out under vacuum, and it leaves a dry cake resting in the base of the glass. In that dry state the material keeps for a very long time, which explains both why it is posted this way and why a sealed vial can sit on a shelf unrefrigerated.

Reconstitution returns that cake to a liquid. Water enters through the stopper, the powder dissolves, and the result is a solution whose strength is known. The peptide content, though, is untouched: ten milligrams go in as powder and ten milligrams remain in solution, whether 1ml was added or 5ml. The only thing the water settles is how widely those ten milligrams are spread, and its effect ends there.

How do you calculate the concentration?

It is one division: milligrams in the vial over millilitres of water added, and nothing else is involved.

Rearranged, the same sum does the calculator's other task. Divide a quantity by the concentration and the answer is the volume containing it; on the second row, 0.5mg at 5 mg/ml works out as 0.5 over 5, which is 0.1ml.

A smaller volume makes a stronger solution and less liquid in all. A larger one makes it weaker, which places quantities on longer, easier-to-read stretches of a barrel. In neither case do the vial's contents change.

What is a unit on a U-100 syringe?

The label U-100 refers to the graduation, not the syringe's capacity. It is marked so that 100 units is 1ml, making one unit 0.01ml. Graduations reach 100 on a 1ml barrel, 50 on a 0.5ml and 30 on a 0.3ml, with identical spacing between marks on every size; the shorter barrels are simply easier to read.

The calculator shows micrograms per unit since no barrel can mark anything smaller than one unit. One unit holds 100mcg at 10 mg/ml and 20mcg at 2 mg/ml. A more dilute solution therefore gives finer resolution, which is a reason to pick the water volume deliberately instead of by habit.

Which water is used to reconstitute a vial?

Three liquids come up in this context, and they are not interchangeable: choosing one over another has consequences.

The volume arithmetic is identical for all three. The difference lies in how long the solution stays usable after the vial has first been entered.

All our vial sizes in one table

The table is drawn from the live catalogue and lists only sizes genuinely in stock. Locate the strength on your label in the first column and read along to the volume you intend to add.

All values are in mg/ml. There are no empty cells, since each row is a size available to order.

Reconstituting a vial, step by step

1. Start at room temperature. Cold powder straight out of a fridge or freezer absorbs water more slowly, so give the vial time to warm up first.
2. Swab both stoppers. Use a fresh alcohol swab on each, on the water vial as well as the peptide vial, before every entry.
3. Take up the chosen volume of water. This is the figure you entered in the calculator.
4. Run it down the side. Tilt the needle so the water slides along the inner wall and collects beneath the cake instead of striking it from above.
5. Roll gently; never shake. A slow roll between the fingers does the job. Surface foam means protein has denatured, and it shows the damage plainly.
6. Be patient. A few minutes is usually enough for the cake to clear, giving a transparent, particle-free solution.
7. Mark the vial. Note the date and the concentration on it, so the figure is still to hand a fortnight on, long after the calculator has been closed.

If haze persists, strands are visible, or some material is still lying on the bottom after a long wait, the powder has not fully dissolved. That is a description of the solution in front of you, not a verdict on the quality of the batch. For evidence about the material itself, a certificate of analysis is available on request, covering the stock your order came from.

How long will a mixed vial keep?

Sealed, dry powder is the long-lived form. It keeps for years in a freezer at around minus 20 degrees, for months in a fridge held between 2 and 8, and for weeks at room temperature if kept dry and dark. Once water is added, the timescale changes completely. Bacteriostatic water gives a working figure of roughly four weeks, with the vial upright in the fridge and shielded from light. Sterile water and water for injection contain no preservative, which makes the vial single entry.

A solution should never be frozen: ice crystals form throughout it and damage the peptide as they grow, with further loss on each freeze-thaw cycle. Bear in mind as well that the purity figure applies to the material when testing finished, not after a month of being jolted about in a fridge door.

Which formats need no reconstitution?

Some formats bypass every step above, since they are never supplied as powder.

Which compounds arrive as powder?

Each compound listed here ships as powder, and its own page carries this same table worked out in its own strengths, alongside the price and the cost per milligram.

• 5-Amino-1MQ 50mg
• AOD-9604 2mg, 5mg, 10mg
• ARA-290 10mg
• BPC-157 10mg
• BPC-157 + TB-500 10mg
• Cagrilintide 5mg, 10mg
• CJC-1295 DAC 2mg
• DSIP 5mg
• GHK-Cu 50mg, 100mg
• GLOW 50mg, 70mg
• Ipamorelin 5mg, 10mg
• Kisspeptin-10 5mg, 10mg
• KLOW 80mg
• KPV 10mg
• Methylene Blue 10mg
• MOTS-c 5mg, 10mg
• NAD+ 500mg
• PT-141 10mg
• Retatrutide 5mg, 10mg, 20mg, 30mg, 40mg
• Semaglutide 2mg, 5mg, 10mg
• Semax 5mg
• SLU-PP-332 10mg, 50mg
• SS-31 10mg, 50mg
• TB-500 10mg
• Tesamorelin 10mg
• Thymosin Alpha-1 5mg, 10mg
• Tirzepatide 5mg, 10mg, 20mg, 30mg, 40mg, 60mg
• VIP 10mg

UK Peptide Reconstitution Calculator questions

How much bacteriostatic water goes into a 10mg vial?

You choose it. The volume determines only the strength, because the vial holds 10mg however much is added: 1ml gives 10 mg/ml, 2ml gives 5 mg/ml, 3ml gives 3.33 mg/ml and 5ml gives 2 mg/ml. Type 10 and your volume into the calculator above for the figure and its U-100 barrel reading.

What is the conversion from mg to units on an insulin syringe?

A U-100 barrel marks 100 units across 1ml, so each unit is 0.01ml. Dividing milligrams by the mg/ml gives millilitres, and multiplying the millilitres by 100 gives units. At 5 mg/ml, for example, 0.5mg is 0.1ml, which reads as 10 units.

Is there less peptide if more water goes in?

No. The amount on the label remains in the vial regardless of the volume used. Additional water only distributes that unchanged quantity through more liquid, which lowers the concentration and means each unit on the barrel holds less.

Can sterile water replace bacteriostatic water?

As far as the arithmetic goes, nothing changes. The difference is preservation. bacteriostatic water contains 0.9% benzyl alcohol, which suppresses microbial growth and is the sole reason a vial can be entered more than once; sterile water and water for injection contain none.

What is the shelf life of a reconstituted vial?

Four weeks is the usual working figure for a vial reconstituted with bacteriostatic water and stored cold, upright and in the dark. With sterile water or water for injection nothing preserves it, so the vial counts as single entry.

Can a vial be frozen once it has been mixed?

Not once mixed. Growing ice crystals damage the peptide in a solution, and each freeze-thaw cycle adds to the loss. Sealed dry powder is different: for long-term storage, the freezer is the right place.

What makes a solution go cloudy?

In most cases the cake has not fully dissolved yet, leaving haze or strands. More time at room temperature with gentle swirling usually clears it. Foam is another matter: shaking causes it, and it is visible, damaged protein.

Will the calculator give me a dose?

No. Its only function is converting between milligrams, millilitres and syringe units, arithmetic that describes a solution. Everything Diluent sells is an unlicensed research compound, supplied for laboratory research, and this site publishes no dosage or protocol guidance on any page.

Is reconstitution needed for pens?

No. A pen arrives already filled at a fixed concentration, leaving nothing to add. The same goes for nasal sprays, while capsules are a finished solid.

Where are the figures for a particular compound?

Each compound has them on its own page: the same table, worked out in that compound's strengths, sits under a reconstitution heading. Every compound supplied as powder is linked in the list above.