Is HJ worth the price difference against Sangon Biotech (Shanghai) on measured results?

Concretely: HJ · Sangon Biotech (Shanghai).

I would like the axes of comparison first and the recommendation second.

I have tried the first option and it works; the question is whether the second is better rather than merely different.

Is there a defensible reason to prefer one, or is this a coin flip?

This is the question where methodology matters more than the conclusion.

Lead time and lane behaviour are supplier properties too and are easier to compare than analytical ones, because they need no laboratory at all.

To compare properly: order the same compound at the same nominal strength from each supplier, submit all samples to the same laboratory in the same submission if possible, and ask for the same test set on each.

No supplier on this site pays for its position, and the storefront links are marked nofollow and sponsored.

Name the laboratory and the dates or the comparison cannot be reproduced.

Ratings on this site are ours alone and are deliberately not reconciled with anyone else's.

Publish the method with the result. A comparison without the laboratory named and the submission dates given is not reproducible by anyone.

Content is the more discriminating measurement than purity for supplier comparison, because purity clusters tightly among competent suppliers and content does not.

One laboratory, one method, one submission. Otherwise it is not a comparison.

edited 12 Jul 2025 by w_okoye — updated for the 2026 guidance change

A single member running three suppliers on one method is worth more than thirty members running one supplier each.

Sample size matters. One order each is an anecdote about six vials; three orders each over a year is the beginning of a comparison.

Price per milligram of measured peptide, not per milligram of label claim.

Start by asking what you are optimising for, because cost per milligram, documentation depth and lead time do not have a common winner.

Cost per milligram of actual peptide is the honest price comparison, which means dividing by measured content rather than by label claim.

Inter-laboratory spread on identical peptide material is routinely half a per cent to a per cent by RP-HPLC, which is the noise floor for any cross-laboratory comparison.

Use a fixed documentation checklist rather than an impression.

edited 27 May 2025 by meniscus_film — fixed an arithmetic slip in the third paragraph