LL-37 reconstitution calculator

LL-37 at a glance

5mg vial + 2mL BAC water = 4 units = 100mcg — Frequency: daily — Best taken: morning, fasted

Full LL-37 dosing reference — reconstitution per vial size, dose-to-units table, side effects and sources.

What it does

• The only cathelicidin antimicrobial peptide naturally produced by the human body — part of the immune system's first line of defense.
• Studied for wound healing, skin conditions, and its broad antimicrobial activity.
• Experimental compound, not FDA-approved — essentially no established protocol for human use outside clinical studies.

Notes

All vial sizes reconstitute to 2.5mg/mL (25mcg/unit) so the syringe reads the same regardless of size.

Side Effects

• Injection site redness or discomfort, gone within hours.
• Mild fatigue as the immune system responds.
• Theoretical excessive immune activation at high doses.
• Very limited human safety data.

LL-37 vial sizes and concentrations

Standard water for each LL-37 vial size in the Dosify Me data, and the concentration it gives. One unit is 0.01 mL on a U-100 insulin syringe.

Worked example for LL-37

1. The example vial: 5 mg of LL-37, mixed with 2.00 mL of bacteriostatic water.
2. Concentration: 5 mg ÷ 2.00 mL = 2.5 mg/mL.
3. One syringe unit is 0.01 mL, so it holds 2.5 mg/mL × 0.01 mL = 0.025 mg (25 mcg).
4. Example quantity: 100 mcg = 0.1 mg.
5. Volume: 0.1 mg ÷ 2.5 mg/mL = 0.04 mL.
6. Syringe reading: 0.04 mL × 100 = 4 units.

Label numbers from the Dosify Me data, used to show the arithmetic. Not a recommendation of any quantity.

Frequently asked

How many units is 100 mcg of LL-37?

At 2.5 mg/mL (the concentration every vial size mixes to), 100 mcg of LL-37 is 4.0 units on a 100-unit insulin syringe (0.040 mL).

How many units is 200 mcg of LL-37?

At 2.5 mg/mL (the concentration every vial size mixes to), 200 mcg of LL-37 is 8.0 units on a 100-unit insulin syringe (0.080 mL).

How many units is 400 mcg of LL-37?

At 2.5 mg/mL (the concentration every vial size mixes to), 400 mcg of LL-37 is 16.0 units on a 100-unit insulin syringe (0.160 mL).

How much bacteriostatic water do I add to a 5 mg vial of LL-37?

2.00 mL, which gives 2.5 mg/mL. Other vial sizes use proportionally more or less water so the syringe reads the same.

How often is LL-37 taken?

Daily. Morning, fasted Typical cycle: 2 weeks on, ~1 week off; repeat 2–3×/year.

Related pages and guides

• LL-37 dosing reference
• How many units is 250 mcg?
• How much bacteriostatic water for a 5 mg vial?
• U-100 vs U-50 insulin syringe for peptides
• How to track peptide doses
• All peptide guides

Other calculators

General peptide calculator · BAC water calculator · Peptide dosing chart · How to reconstitute peptides · mcg to units chart