QSC vs Peptide Sciences — LL-37 | Research Grade Comparison
QSC vs Peptide Sciences — LL-37
Research-grade comparison for laboratory procurement decisions
This page provides a factual comparison of QSC and Peptide Sciences as suppliers of research-grade LL-37. Key criteria for research procurement: purity specification, COA type (independent vs in-house), synthesis method, domestic shipping availability, and dispatch speed. See the LL-37 research hub for full mechanism, protocols, and study data.
QSC vs Peptide Sciences — LL-37 research grade comparison
Criterion
QSC
Peptide Sciences
Purity
≥99% HPLC verified — Janoshik COA
Variable — often ≥98% specification, COA on request
COA type
Independent third-party (Janoshik)
In-house or third-party — verify per order
Synthesis
Fmoc SPPS — Qingdao direct manufacture
Varies — direct or intermediary
Peptide sequence
LL-37 — confirmed by MS
Confirm by COA MS data
Domestic shipping
USA · EU · UK · Canada · Australia
Check per supplier region
Dispatch speed
Same-week
Variable per supplier
Bulk availability
Multi-vial research kits
Varies
Calculator tools
Yes — reconstitution & dosing calculator
Not always available
What to verify when procuring research-grade peptides
For LL-37 research, confirm: (1) purity specification and method (HPLC — not just “≥98%”); (2) COA issuer — independent labs (Janoshik, Intertek) vs in-house; (3) peptide identity by MS (not just HPLC retention time); (4) domestic shipping availability for your region; (5) batch-to-batch consistency records if running multi-cohort studies.
Research Use Only: All QSC compounds are sold strictly for laboratory research purposes. Not for human use. Not approved by the FDA or equivalent regulatory bodies for human administration. All purchases confirm research intent and compliance with applicable local regulations.
