Reconstitution Calculator

Mixing the dry peptide powder in your vial with sterile water so it becomes a liquid you can draw into a syringe. The peptide ships freeze-dried (lyophilized) so it stays stable on the shelf — it only becomes injectable once you add water. Reconstitution is a one-time step you do when you first open the vial.

Bacteriostatic water is sterile water that contains 0.9% benzyl alcohol — a preservative that prevents bacteria from growing in the vial after you open it. That's important because peptide vials are multi-dose: you draw from the same vial over 28+ days. Tap water and saline are not interchangeable. Don't substitute either. We sell 3 mL bacteriostatic water vials on the shop.

A 1 mL syringe with 100 small tick marks on the barrel. Each tick = 1 unit = 0.01 mL. They're cheap, sold at most pharmacies, and the standard tool for peptide research because the small ticks let you draw very precise doses. The "U-100" just means there are 100 units of marking per millilitre.

1 mg = 1000 mcg. Most repair-style peptides (BPC-157, TB-500, KPV, GHK-Cu) are dosed in micrograms (mcg) — research protocols typically use 250–500 mcg per injection. GLP-1 peptides (retatrutide, semaglutide) are dosed in milligrams (mg) — typically 1–6 mg per injection. The calculator handles both — just toggle the unit on the right side of the dose input.

Most published BPC, TB, and GHK-Cu protocols reconstitute at 2 mL — it's the safest default and gives clean syringe-tick numbers for typical doses. Pick 1 mL for a stronger mix (good if your dose is large and you want fewer units to draw). Pick 3 mL for finer dose control on very small doses (like CJC + Ipa). The vial size doesn't change — only how concentrated the liquid becomes.

Bacteriostatic water's 0.9% benzyl alcohol typically supports a 28-day window when the reconstituted vial is refrigerated at 2–8°C (regular fridge temperature). Stability varies a bit by peptide — see the peptide stability and storage guide for compound-specific data.

1. Wipe the rubber stopper of both the peptide vial and the bacteriostatic water vial with an alcohol wipe. 2. Use a syringe to draw the amount of bacteriostatic water shown above (look at "Your mix strength" — if you used 2 mL water, draw 200 units / 2 mL). 3. Insert the needle into the peptide vial at an angle and inject the water slowly down the inside wall of the vial. Don't squirt directly onto the powder. 4. Swirl gently — never shake — until the powder fully dissolves into a clear liquid. 5. Refrigerate. Each subsequent dose: wipe the stopper, draw to the line shown in the syringe diagram above, inject.

Concentration (mg/mL) = peptide milligrams in the vial ÷ millilitres of bacteriostatic water. Units to draw = (target dose in mg ÷ concentration) × 100. Example: 10 mg BPC-157 + 2 mL water = 5 mg/mL. For a 250 mcg (0.25 mg) dose: (0.25 ÷ 5) × 100 = 5 units on the syringe.

U-100 syringes are the standard format used in published research protocols. They mark 100 units per millilitre, so 1 unit equals 0.01 mL regardless of which peptide is loaded. The unit count is therefore directly comparable across reconstitution volumes.

Blend vials report the combined milligrams across all actives — GLOW is 70mg total (50mg GHK-Cu + 10mg BPC-157 + 10mg TB-500), BPC + TB is 10mg total (5mg + 5mg). The "units to draw" output reflects the blend as a single unit, and each draw delivers the components in their native ratio.

HCG is dosed in international units (IU), not milligrams, so the mg/mL math does not apply directly. A separate HCG calculator with IU-based reconstitution math will be added later. For now, refer to the HCG product page for vial-specific reconstitution notes.

Every Remy Peptides vial ships with batch ID matching a published Janoshik HPLC certificate. Open the COA library to look up a specific batch, or read how to verify a Janoshik COA for a step-by-step walkthrough.