What Purity Level Is Right for Research?
For most research assays, 98% HPLC purity is the practical minimum, while 99% is reserved for highly sensitive work where even trace impurities shift results. Understanding this trade-off prevents both overpaying and under-specifying.
What 95% Purity Means in Practice
A 95% purity grade leaves up to 5% impurities, which can introduce confounding signals in sensitive assays and is generally not acceptable for reproducibility-sensitive research. Reserve lower-purity grades for preliminary or non-critical work, if at all.
Why 98% Is the Standard Baseline
The 98% threshold is where HPLC purity, paired with MS identity confirmation, gives most labs confidence that impurities will not meaningfully shift results. This is the baseline you should specify when ordering peptides like Tesamorelin or ACE-031.
For a deeper explanation of how HPLC and MS work together, see our purity guide.
When to Pay for 99%
Choose 99% purity only when your assay is sensitive enough that even trace impurities matter, because the price premium is real and the marginal benefit is zero for routine work. Match the grade to the assay, not the other way around.
For bulk pricing at your required purity grade, contact us on WhatsApp: +852 4419 8097.
Frequently Asked Questions
Q1: Is 95% peptide purity good enough?
For most reproducibility-sensitive research, no — 95% leaves up to 5% impurities that can shift results; 98% is the practical baseline.
Q2: What is the difference between 98% and 99% purity?
98% is sufficient for most assays, while 99% is reserved for highly sensitive work where even trace impurities matter and carries a price premium.
Q3: Does HPLC purity alone confirm the peptide is correct?
No — HPLC measures purity (peak area) but only mass spectrometry confirms the molecular identity, so both are required.
Important: All products are sold strictly for laboratory and research purposes only — not for human or veterinary use. No medical, therapeutic, or dosing guidance is provided or implied. Researchers are responsible for compliance with their institution and local regulations.