Antimicrobial peptide
LL-37
A 37-residue cathelicidin-derived antimicrobial peptide. Long sequences are expensive to synthesise and purify, which shows up in the per-milligram spread.
Also listed as: Cathelicidin LL-37 · CAP-18 fragment
Data as of · newest price observation on this page
Cheapest observed
$7.80/mg17 observations · 15 vendors · 2.56× spread
Dearest observed
$20.00/mgPrice per milligram
Observed vendor prices
Each row is a single vial of lyophilised powder, read from the vendor's own public store data at the timestamp shown. Kits, capsules, pre-mixed solutions and blends are excluded because they are not comparable per milligram.
| Vendor | Vial | Form | Price | $ / mg | Stock | Observed |
|---|---|---|---|---|---|---|
| Ascension Peptides | 10 mg | Lyophilised powder | $78.00 | $7.80 | In stock | Nov 5, 2026 source ↗ |
| EZ Peptides | 10 mg | Lyophilised powder | $78.00 | $7.80 | In stock | Nov 5, 2026 source ↗ |
| Paramount Peptides | 10 mg | Lyophilised powder | $85.00 | $8.50 | In stock | Nov 5, 2026 source ↗ |
| Modern Aminos | 5 mg | Lyophilised powder | $47.00 | $9.40 | In stock | Nov 5, 2026 source ↗ |
| Pure US Peptide | 5 mg | Lyophilised powder | $47.25 | $9.45 | In stock | Nov 5, 2026 source ↗ |
| Verified Peptides | 5 mg | Lyophilised powder | $65.00 | $13.00 | In stock | Nov 5, 2026 source ↗ |
| Loti Labs | 5 mg | Lyophilised powder | $71.99 | $14.40 | In stock | Nov 3, 2026 source ↗ |
| Evolve Peptides | 5 mg | Lyophilised powder | $72.00 | $14.40 | In stock | Nov 5, 2026 source ↗ |
| Alpha Carbon Labs | 5 mg | Lyophilised powder | $75.00 | $15.00 | In stock | Nov 5, 2026 source ↗ |
| Paramount Peptides | 5 mg | Lyophilised powder | $75.00 | $15.00 | In stock | Nov 5, 2026 source ↗ |
| Protide Health | 5 mg | Lyophilised powder | $75.00 | $15.00 | In stock | Nov 5, 2026 source ↗ |
| PSPeptides | 5 mg | Lyophilised powder | $79.99 | $16.00 | In stock | Nov 5, 2026 source ↗ |
| Biotech Peptides | 5 mg | Lyophilised powder | $86.00 | $17.20 | In stock | Nov 5, 2026 source ↗ |
| Core Peptides | 5 mg | Lyophilised powder | $89.00 | $17.80 | In stock | Nov 5, 2026 source ↗ |
| BioLongevity Labs | 5 mg | Lyophilised powder | $94.97 | $18.99 | In stock | Nov 5, 2026 source ↗ |
| Licensed Peptides | 5 mg | Lyophilised powder | $99.99 | $20.00 | In stock | Nov 5, 2026 source ↗ |
| Evolve Peptides | 2 mg | Lyophilised powder | $40.00 | $20.00 | Out of stock | Nov 5, 2026 source ↗ |
Prices are observations recorded from each vendor’s own public store data at the timestamp shown, not live quotes. Some vendor links may be affiliate links and vendors may buy labelled placements — see disclosures. Commercial arrangements never affect a purity result or a published grade.
Verified batches
Third-party purity results for LL-37
Blinded retail purchase, labels stripped, RP-HPLC in triplicate against a reference standard, published pass or fail.
No batches published yet — first blinded results in progress
When a LL-37 lot completes testing, this section carries the lot number, the claimed and measured purity, the delta between them, the method, the laboratory and the chain-of-custody note. Read the methodology.
Tools
Work the numbers
Both calculators run entirely in your browser. Nothing you enter is sent anywhere.
Cost per verified milligram
Sticker price per mg
$9.00
Price ÷ labelled mass, assuming the label.
Cost per verified mg
$9.18
Price ÷ (labelled mass × measured purity). What a milligram of the actual compound costs.
Difference
+2%
0.2 mg of the labelled mass is not the compound.
Enter a measured purity from a result you trust. VialPost does not supply a default purity figure, because assuming one would defeat the point of measuring it.
Reconstitution
Concentration
5 mg/mL
Concentration
5000 µg/mL
Volume containing target mass
0.05 mL
5 units on a U-100 graduated syringe (100 units = 1 mL)
A unit conversion for laboratory handling only. VialPost publishes no dosing, protocol or administration guidance of any kind, and nothing here is medical advice.
Questions
LL-37 — frequently asked
- How is the LL-37 price per milligram calculated?
- The observed vial price is divided by the mass printed on the vendor listing. Only single-vial listings are used; multi-vial kits and multi-component blends are excluded because their per-milligram figures are not comparable to a single vial of one compound.
- Is the cheapest LL-37 listing the best value?
- Not necessarily. Price per milligram assumes the label is accurate. If a vial assays below its claimed purity, the real cost of a milligram of the compound is higher than the sticker figure — which is what the cost-per-verified-milligram calculator on this page shows.
- Has VialPost tested LL-37?
- Not yet. The verified batch registry is empty while the first blinded retail purchases are in progress. No purity figure for this compound is published on this site until a third-party laboratory has returned a result.
Get new batch results
One email when a batch is published or a vendor status changes. No product promotions.