A peptide dosage calculator determines how many units to draw on your syringe to achieve a precise mcg dose. It uses the formula: Units = (Desired dose mcg ÷ Total peptide mcg) × (BAC water ml × Syringe units per ml). This eliminates manual maths errors and ensures consistent, accurate dosing for laboratory research.

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The amount of bacteriostatic water depends on your desired concentration. Adding 1 ml to a 5 mg vial gives 5000 mcg/ml; adding 2 ml gives 2500 mcg/ml. More water means a lower concentration and larger injection volumes per dose. The calculator above adjusts automatically — simply select your water volume and it recalculates the units to draw.

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For peptide research, insulin syringes of 0.3 ml (30 units), 0.5 ml (50 units), or 1.0 ml (100 units) are most commonly used. Smaller syringes (0.3 ml) allow more precise measurement for low-dose peptides. The calculator is compatible with all three sizes and custom volumes — choose the syringe that covers your required draw volume without exceeding capacity.

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To calculate BPC-157 dosage: select your syringe size, choose 5 mg as the vial quantity (standard BPC-157 vial), select how much BAC water you added (e.g. 2 ml), then select your research dose (e.g. 250 mcg). The calculator will display exactly how many syringe units to draw. BPC-157 is commonly researched at doses of 200–500 mcg per administration in preclinical studies.

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For TB-500 calculation: select your syringe size, choose your vial size (e.g. 5 mg or 10 mg), add the BAC water volume you used, then enter your desired research dose in mcg. TB-500 is often studied at 2–5 mg doses in animal research — use the "Other" option to enter any custom mg amount not listed in the presets.

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Bacteriostatic water (BAC water) is sterile water containing 0.9% benzyl alcohol, which inhibits bacterial growth. It is the preferred solvent for reconstituting lyophilised research peptides because it extends the shelf life of the solution (up to 28 days) and is compatible with most peptides. Standard sterile water can also be used but requires the solution to be used within 24 hours.

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To convert mcg to syringe units manually: Units = (mcg dose ÷ total mcg in vial) × (BAC water ml × syringe units/ml). Example: for a 250 mcg dose from a 5 mg (5000 mcg) vial reconstituted with 2 ml BAC water in a 100-unit syringe: (250 ÷ 5000) × (2 × 100) = 10 units. The calculator above does this automatically and eliminates error.

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Reconstituted peptide solutions reconstituted with bacteriostatic water are generally stable for 3–4 weeks at +4°C (refrigerator) and 3–4 months at −20°C (freezer). To maximise stability, divide the solution into single-use aliquots before freezing to avoid repeated freeze-thaw cycles. Lyophilised (unreconstituted) peptide powder is stable for 24+ months when stored at −20°C.

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