1 mg = 1,000 mcg. Most peptides are dosed in micrograms (mcg), not milligrams (mg). A vial labelled "5 mg" contains 5,000 mcg of peptide.

Units (IU) are a completely different measurement used for some hormones and bacteriostatic water syringes. On a 100-unit insulin syringe, each small tick mark = 1 unit = 0.01 mL.

Mixing up mg and mcg is one of the most common dosing errors — always confirm which unit a dose is stated in before calculating.

Insulin syringes are marked in units, not mL. The two most common sizes:

• 100-unit (1 mL) syringe — each unit = 0.01 mL. 50 units = 0.5 mL.

• 50-unit (0.5 mL) syringe — each unit = 0.01 mL. 25 units = 0.25 mL.

To convert a volume in mL to syringe units, multiply by 100. For example, 0.25 mL = 25 units on a 100-unit syringe.

This app's reverse calculator handles this conversion for you — enter your desired dose and it shows the exact syringe mark to draw to.

Concentration = how much peptide is dissolved in how much liquid.

Example: 5 mg peptide + 2 mL BAC water = 2,500 mcg per mL.

Concentration (mcg/mL) = (vial size in mg × 1,000) ÷ mL of BAC water added

Adding more water lowers the concentration — meaning you inject a larger volume to get the same dose. Adding less water raises the concentration — smaller injection volume per dose.

Peptides arrive as a dry, freeze-dried (lyophilized) powder. You dissolve them in bacteriostatic water (BAC water) before use.

1 Wipe the rubber stopper on both the peptide vial and the BAC water vial with an alcohol swab. Allow to dry.

2 Draw your desired volume of BAC water into the syringe.

3 Insert the needle into the peptide vial at an angle and let the water run down the side of the vial — do not squirt directly onto the powder.

4 Gently swirl (do not shake) until the powder is fully dissolved. The solution should be clear.

5 Refrigerate immediately. Most reconstituted peptides are stable for 4–6 weeks when refrigerated and kept away from light.

The amount of BAC water you add determines how concentrated each dose is and how small or large each injection volume will be.

• Less BAC water → higher concentration → smaller injection volume per dose (easier to inject, but less room for error when measuring).

• More BAC water → lower concentration → larger injection volume per dose (easier to measure precisely, but more fluid per injection).

A common approach for SubQ injections is to target 0.1–0.3 mL per dose. Work backwards from your target dose to choose how much BAC water to add.

The number of syringe units you draw is just a volume measurement. Whether that volume contains a large or small dose depends entirely on the concentration of your solution.

Example: 20 units (0.2 mL) from a vial reconstituted with 1 mL BAC water contains twice the dose of 20 units drawn from the same vial reconstituted with 2 mL BAC water.

Always start from your desired dose in mcg, not from a syringe mark. Use the calculator to find the correct mark for your specific reconstitution.

SubQ (subcutaneous) injections go into the layer of fat just under the skin — not into muscle. Common sites: abdomen (2 inches from navel), outer thigh, or upper arm.

1 Wipe the injection site with an alcohol swab and let it dry completely.

2 Pinch a small fold of skin. Insert the needle at a 45° angle (or 90° if using a very short needle).

3 Inject slowly and steadily. Do not aspirate (pulling back the plunger is not recommended for SubQ).

4 Withdraw the needle and apply light pressure. Do not rub.

Site rotation: Rotate injection sites each time to prevent lipodystrophy (lumpy or thinning skin). Keep a mental map or use the Schedule tab to track sites.

Lyophilized (unreconstituted) powder: Store in a cool, dark place. Most peptides remain stable for 1–2 years when kept dry and away from heat and UV light.

Reconstituted (mixed) solution: Refrigerate immediately after mixing. Store away from light. Most peptides are stable for 4–6 weeks when refrigerated. Avoid repeated freeze-thaw cycles.

Tips: Keep vials upright. Use an opaque bag or wrap vials in foil if your fridge has a light. Do not store next to the fridge door where temperature fluctuates.

1. Confusing mg and mcg. A dose of "250" could be 250 mcg or 250 mg — the latter is 1,000× more. Always confirm the unit.

2. Shaking the vial. Shaking can degrade peptides. Always swirl gently.

3. Squirting BAC water directly onto the powder. Aim for the glass wall instead to preserve peptide structure.

4. Reading the wrong syringe. A 50-unit syringe and a 100-unit syringe have different tick-mark scales. Confirm which syringe you have before drawing.

5. Not rotating sites. Repeated injections into the same spot cause tissue damage over time.

6. Leaving reconstituted peptide at room temperature. Refrigerate immediately after mixing to preserve potency.

The reverse calculator starts from your desired dose (in mcg) and works backwards to tell you exactly which mark to draw to on your syringe.

• Vial size (mg) — how much peptide is in the vial

• BAC water added (mL) — how much you used to reconstitute

• Desired dose (mcg) — how much peptide you want to inject

• Syringe size (50-unit or 100-unit) — which syringe you are using

The calculator shows the volume in mL and the corresponding syringe unit mark. Use "Show math" to see the full step-by-step calculation.

Scheduling is about timing — which days and times you inject each peptide. The Schedule tab generates a calendar view of your protocol so you never miss a dose or accidentally double-dose.

Stack planning (Stacks tab) is about combination — which peptides you pair together in a protocol, and at what doses. A stack is your full protocol design before it becomes a schedule.

Typical workflow: design your stack → save it as a protocol → view it on the schedule → log each dose in History.