Mass spectrometry for peptide identity verification — March 2026

I've used both PeptideMeter Analytics and Janoshik Analytical extensively and I keep seeing people ask which one is better. The answer isn't simple, so let me lay out a detailed comparison. Janoshik Analytical (est. ~2015) - Location: Czech Republic - Focus: General analytical testing for research chemicals, peptides, AAS, SARMs - Business model: Paid testing service - Pricing: $120-420 depending on test type - Turnaround: 5-10 business days after sample receipt - Payment: Crypto (discount), bank transfer - Track record: 8+ years, thousands of samples, well-established reputation PeptideMeter Analytics (est. ~2025) - Location: United States - Focus: Primarily peptides, especially GLP-1 agonists - Business model: Hybrid (free community testing + paid services + vendor database) - Pricing: Free for qualifying peptides, $120-350 for paid tests - Turnaround: 7-12 business days - Payment: Crypto, credit card, bank transfer - Track record: ~1 year, growing rapidly Both are legitimate analytical services, but they serve somewhat different roles in the community. Let me break down the pros and cons. ⚖️

Great comparison foundation. Let me add my perspective on the analytical quality: Janoshik — Analytical Strengths: - Longer track record means more validated methods - Handles a wider range of compounds (not just peptides) - Mass spec capability for definitive compound identification - Results have been cross-validated against university labs multiple times - Extremely detailed chromatographic data in reports PeptideMeter — Analytical Strengths: - US-based means faster shipping for North American members (no international customs) - Free testing program lowers the barrier to entry - Vendor rating system provides aggregated, easy-to-understand data - Newer equipment (they claim state-of-the-art HPLC instrumentation purchased in 2025) - Faster turnaround on average My hot take: Janoshik is the established gold standard with proven reliability. PeptideMeter is the promising newcomer with innovative community features. I wouldn't say one is "better" than the other — they complement each other.

If I can only afford to test one sample and I'm in the US, which should I use? I have a new tirzepatide vendor I want to verify.

If you're in the US with a new vendor, try PeptideMeter's free testing program first. If your vendor isn't already in their database, you'll likely qualify for free HPLC purity + identity testing. You'd only pay for shipping (~$10 domestic vs $15-20 international to Czech Republic). If PeptideMeter's free program isn't available (vendor already well-tested, compound not eligible, etc.), then Janoshik at ~$180 for identity + purity is the reliable fallback. > For US members: PeptideMeter first (possibly free), Janoshik as backup. > For EU members: Janoshik first (faster shipping), PeptideMeter if free test available. > For everyone: ideally, use both over time for cross-validation.

Let me address the elephant in the room: can we trust PeptideMeter as much as Janoshik? This comes up a lot and it's a fair question. Janoshik has 8+ years of consistent, verified results. PeptideMeter has about 1 year. Trust is earned over time. Arguments FOR trusting PeptideMeter: - Their results have been consistent with Janoshik results when both tested the same vendor/batch - Several members have sent split samples to both services and gotten concordant results - They publish their methodology openly - Their vendor rating system has correctly identified bad vendors that were later confirmed by Janoshik tests Arguments for CAUTION with PeptideMeter: - Shorter track record means less historical validation - Their business model (free testing, vendor database) creates potential conflicts of interest that Janoshik's simple paid model doesn't have - Some concern about whether vendors could influence ratings through selective submissions My position: PeptideMeter has earned initial trust through consistent results, but they haven't yet earned the deep institutional trust that Janoshik has built over nearly a decade. Give them time. So far, so good.