A contract manufacturer qualified GHK-Cu so the lot data held up at its client's incoming QC
A contract manufacturer making a copper-peptide serum for a brand client needed an active whose documentation survived inspection twice — its own incoming check and the client's audit of the finished good. The qualification turned on copper-quantification method and re-auditable lot data.
Published May 5, 2026 · Anonymized customer story
Lot data
Re-auditable at client QC
Copper method
Agreed before first lot
Coordination
Evidenced, not assumed
Supply
Schedulable across the run
Challenge
The manufacturer had won a copper-peptide serum programme but carried the usual double exposure: a raw material that passed its own incoming QC and then embarrassed it when the brand client audited the finished product would be worse than useless. Its previous copper-active source reported copper presence but not coordination, and the copper-content number came by a method the manufacturer could not fully defend to a second reader. It needed an active qualified to be re-examined by someone who was not in the room when the lot was released.
Approach
Cupratec supplied GHK-Cu with per-lot identity, purity, copper content, and Cu²⁺ : peptide ratio, plus the UV-Vis spectrum that evidences the coordination rather than merely the presence of copper. Crucially, the copper-quantification method was agreed with the manufacturer up front — weighing the trade-offs between atomic absorption, ICP-MS, and HPLC-DAD against what the manufacturer's release and the client's specification actually required — so the figure on the COA was one the manufacturer could stand behind under questioning. Lot-to-lot consistency in copper content, coordination, and colour was held so a production run could be scheduled against predictable material.
Outcome
The lot documentation was built to assume a second reader, and it cleared the client's audit of the finished good on the same evidence that cleared the manufacturer's incoming QC. With the copper-quantification method settled in advance, there was no provenance argument to have when the client's quality team asked how the number was derived. Supply stayed consistent enough across the programme that the manufacturer could commit to a run schedule rather than rebuild confidence each quarter.
“The lot data has to survive QC twice — ours and the client's. Agreeing the copper-quantification method before the first lot, instead of being handed a number, is what let me defend the COA when the client's quality team pushed on it.”