Bitter melon peptide (Polypeptide-K, mcIRBP-class) is a standardized botanical peptide used in functional nutrition formulations. Quality varies widely between sources. Here is the checklist serious buyers use.
1. Ask how the active is standardized
A credible supplier states the marker and the assay method (for example 75% / 85% grades, assayed by UV). If the spec sheet cannot name the test method, walk away.
2. Review a representative COA before ordering
A proper Certificate of Analysis covers assay, appearance, loss on drying, heavy metals (Pb/As/Hg) and microbiology. Every shipment should come with a lot-specific COA.
3. Confirm manufacturer vs trader
Ask directly: do you operate the production line? Manufacturers can host an audit, show batch records and answer process questions the same day.
4. Check extraction method
Solvent systems affect residue profiles. Water-based, patented extraction processes are preferable for food-grade applications.
5. Verify certifications match your market
ISO 9001 / 22000 and HACCP as the baseline; HALAL and KOSHER for dietary markets; FDA facility registration for the US; SC license for legal manufacture in China.
6. Test lot-to-lot consistency
Request COAs from three different lots. The assay values should hold within a tight band.
7. Start with a sample
A supplier confident in its material makes sampling easy. Typical MOQ for standardized grades is 1 kg.
BolinHerb manufactures bitter melon peptide factory-direct in 75% / 85% grades. Ask our AI assistant for the representative spec and COA.