Lyophilised means freeze-dried. The term describes a process and physical presentation; use separate measurements for content, remaining water and the properties listed on the certificate.
What freeze-drying describes
Freeze-drying involves freezing and removing water under reduced pressure. During primary drying, ice passes directly into vapour; secondary drying is a further stage. This general description does not establish the cycle or equipment used for a particular supplied lot.FDA freeze-drying guide (opens in a new tab)
A dried material can still have measurable water. The supplied GHK-Cu 50 mg report, for example, describes a lyophilised material and separately reports 3.70% water. These are two different fields, not contradictory descriptions.GHK-Cu report (PDF) (opens in a new tab)
A residual-water result describes water measured in the analysed sample. Moisture uptake is a different property, measured across a specified exposure and material form. A single water-content value does not establish how much moisture the powder would take up under another humidity condition.Chan et al. (2004) (opens in a new tab)
Keep appearance and results separate
| Question | Evidence to look for |
|---|---|
| Which material is it? | A defined identity and matching lot report |
| How much target material is present? | Content or assay with a stated basis |
| How much water remains? | Residual-water result and method |
| What does its appearance mean? | The documented appearance requirement and any discrepancy review |
| Which storage period applies? | Material-specific conditions and supporting stability evidence |
A photograph is not a calibrated content assay. If the received material differs from its documented appearance, keep the label, lot details and a description of the discrepancy for an enquiry. Do not assign a chemical cause from appearance alone.Bachem analytical guide (opens in a new tab)
Read storage evidence for the actual form
The word lyophilised does not assign an expiry date. Stability evidence needs to cover the relevant material, form, packaging, conditions and measured attributes. A record for a different presentation does not fill that gap.ICH Q1A(R2) — Stability terminology (opens in a new tab)
Use the supplied label and Novum’s storage information for the applicable instructions. Keep any unprovided duration unresolved; neither the drying term nor the measured moisture value alone establishes it.Storage and handling (opens in a new tab)ICH Q1A(R2) — Stability terminology (opens in a new tab)
Sources and further detail
- FDA — Freeze-drying inspection guide (1993) (opens in a new tab)
Historical process explanation only; no product-specific manufacturing claim.
- Supplied GHK-Cu 50 mg certificate (opens in a new tab)
MA-GHK-0001, revision 01; task URDL5Q2; lot GHK-01-5Q2. Source of the complex, content and ratio examples. The cited PDF was re-read on 3 October 2026 to check this transcription; its issuer and findings were not independently authenticated.
- Bachem — Quality control of amino acids and peptides (opens in a new tab)
Sections on identity, purity and product content. Used for the distinction between chromatographic area and material content.
- ICH Q1A(R2) — Stability terminology (opens in a new tab)
Terminology and the relationship between stability, defined material and storage conditions.
- Novum Peptides — Storage and handling (opens in a new tab)
First-party label-directed storage information.
- Chan et al. (2004), PMID 14762916 (opens in a new tab)
Existing source from the powder-hygroscopicity dossier. Used only to distinguish water content from condition-specific sorption measurement; no study outcome or storage threshold is transferred to a supplied product.
Revised from the existing source dossier on 3 October 2026. Supplied-report values are document transcriptions, not independent authentication or new measurements. Source notes identify the scope of each reference; this article has not undergone independent scientific peer review.