Lyophilized Vials vs Capsules
Format comparison · research use only
Most compounds in this catalog are supplied as lyophilized powder in a sealed vial; a subset is also supplied in encapsulated form. The two formats differ in physical state, preparation, and storage — not in the analytical standard applied to them.
| Property | Lyophilized vial | Capsule format |
|---|---|---|
| Physical state | Freeze-dried solid, sealed glass vial | Encapsulated solid, sealed container |
| Requires reconstitution | Yes — prepared into solution before study | No |
| Typical storage | −20 °C, protected from light and moisture | Cool, dry, away from light; refrigeration extends shelf life |
| Content specification | Stated mass per vial (e.g. 10 mg) | Stated count per container (e.g. 30 capsules) |
| Freeze-thaw consideration | Avoid repeated cycles once reconstituted | Not applicable |
| Purity standard | ≥99.2% (HPLC) | ≥99.2% (HPLC) on the active compound |
| Lot documentation | Lot-specific COA | Lot-specific COA |
Why lyophilization is used at all
Freeze-drying removes water, and water is what drives most peptide degradation pathways. A lyophilized solid stored cold and dark is substantially more stable than the same peptide in solution, which is why reference materials ship dry and are reconstituted immediately before study rather than supplied pre-dissolved.
Choosing a format for a protocol
The vial format gives control over concentration, because the researcher chooses the reconstitution volume. The encapsulated format removes the reconstitution step and the associated handling variables, at the cost of that flexibility. Both carry the same independent U.S. laboratory testing and the same lot-specific documentation.
For the mechanics of preparing a lyophilized vial, see reconstitution and storage.
Supplied strictly as a research reference material for in-vitro laboratory use. Not for human or veterinary use.
Frequently asked questions
Are capsules and vials tested to the same standard?
Yes. Both formats are released against independent U.S. laboratory testing with a lot-specific Certificate of Analysis, and the active compound meets the same ≥99.2% purity floor.
Why are most research peptides supplied lyophilized?
Removing water removes the main driver of peptide degradation. A lyophilized solid stored at −20 °C, protected from light and moisture, is considerably more stable than the same peptide held in solution.