What should a vial label tell me, and what stability signs can I actually look for?
Updated: 2026-09-09 · Buying, quality and COA
Short answer
A useful label identifies the compound, the stated amount, a batch number and a date, and lets you find the COA for that exact batch. On stability, the sensible rule is to follow the manufacturer's instructions for that specific product, and to distrust a vial that looks wrong: melted or caked powder, cloudy liquid, particles, or a damaged seal.
In plain English
- Traceability means the batch on the label matches the batch on the certificate.
- Without a batch number, a generic COA proves nothing about your vial.
- Storage conditions are product-specific; there is no universal rule.
- Shipping matters: a lyophilised product that arrived hot or damaged is no longer comparable to what was tested.
What we know
- Batch traceability is the basis of any quality control.
- Manufacturers of approved medicines specify exact storage conditions in the label.
What we don't know yet
- Research-labelled products usually have no published stability data.
- Peptide degradation cannot be assessed by eye.
Always follow the manufacturer's storage instructions for the specific product. No universal rules are given here.