Reference only. This page covers what the compound is, how it is presented and how it is handled. It does not give dosing protocols or administration schedules, and it is not medical advice.
What LL-37 is
LL-37 is the sole cathelicidin found in humans, released by cleavage of the hCAP-18 precursor. It is 37 amino acids long and begins with two leucines, which is where the name comes from. It is part of innate immunity rather than a signalling hormone.
How the pen is supplied
Solution in a sealed 3 ml pen graduated in 300 dial units. At 6 mg the content is among the lowest in the range.
Pen specification
| Class | Antimicrobial peptide, 37 amino acids |
| Also known as | Cathelicidin, hCAP-18 fragment |
| Content | 6 mg |
| Fill volume | 3 ml |
| Dial graduation | 0.01 ml per unit |
| Total dial units | 300 |
| Per dial unit | 20 mcg |
| Cost per mg | £10 per mg |
Milligrams per dial unit and cost per milligram are calculated from the pen strength, its fill volume and the current live price. Every SerenQ pen is graduated at 0.01 ml per unit.
Verification
Independent HPLC per batch, identifier printed on the pen.
Stocked at The PED Shop
- SerenQ LL-37 6mg Peptide Penout of stock£60
Availability checked 2026-09-04. The product page carries live stock.
Common questions
Where does the name come from?
Two leucine residues at the N terminus, followed by a length of 37 amino acids.