Ampoule vs serum vs essence: what does the format change?

An ampoule, a serum and an essence can hold very similar formulas; the container is what differs. A sealed vial holds a small closed portion drawn through a stopper, a dropper bottle is opened to air at every use, and an essence is a thinner layer poured from a bottle. The format changes portioning, air exposure and the demands on preservation.

Three words, no fixed definitions

None of the three terms is defined in cosmetic regulation in the United States, Canada or the European Union. They describe texture, concentration and packaging by convention, and brands use them differently.

The last row carries two meanings. In much of the market "ampoule" simply names a stronger serum in a bottle. In the treatment room it means a small sealed glass container that holds a portion of product. Only the second meaning changes how the product is used.

What the format changes

Portioning

A 30 ml bottle holds weeks of product. Each use takes an amount judged by eye or by a dropper. A sealed vial holds a fixed small volume, used over a small number of applications, so every portion comes from a unit that has held only a few doses.

For a clinic, portioning also means a fresh unit per client or per course, and a count that matches the number of treatments.

Exposure to air and hands

A dropper bottle is opened to room air every time it is used, and the dropper returns to the bottle after touching the air and, often, the skin or fingers. A pump bottle reduces air exposure but still draws air in as product leaves.

A stoppered vial works differently. The dose is drawn through a rubber stopper with a syringe, the stopper closes behind it, and the contents are not opened to air between applications. The detail of the closure: the sealed vial format.

A snap-top glass ampoule cannot be closed again once snapped. Its contents are used at that session or thrown away.

Demands on preservation

Every cosmetic that is used more than once is preserved, whatever its container. The preservation system is designed for the conditions the product will meet in use. A bottle opened daily for months meets many more chances of contamination than a closed vial entered through a stopper a few times.

Preservation is part of every format. The format changes how much the preservation system is asked to do over the life of the product.

Where strength comes from

Strength is set by the formula, whatever the name on the pack. Concentration comes from the formula; the ingredient list and any declared percentage are the reliable guide. How to read one: how to read an ingredient list.

Two products with the same ingredients make the same claims, whatever they are packed in.

How Vegalab formats compare

Vegalab NanoSerums come in up to three formats, chosen for how and where the product is used. An overview for clinics: professional formats.

Sealed vial set. Ten 5 ml vials, each closed with a butyl stopper and a 20 mm aluminum crimp with a flip-off cap. The vials and stoppers are sterilized before filling. The serum is a preserved cosmetic formulation. Each vial holds three full applications, thirty per box. After the first draw, refrigerate and use within 28 days. Expiry date and lot number are on every carton. Example: Hyaluronic Skin Repair NanoSerum, Sealed Vial Set.

30 ml bottle. The daily format for home use. Example: Hyaluronic Skin Repair NanoSerum, 30 ml.

250 ml bottle. The back-bar format for the treatment room. Example: Hyaluronic Skin Repair NanoSerum, 250 ml.

The active at the center of this range: hyaluronic acid.

Using a sealed vial

Flip off the cap. Leave the aluminum ring and the stopper in place. Draw one 1.5 ml application through the stopper with a syringe. Dispense onto the skin or into a fresh dish, never dip, and never return product or an applicator to the vial. If the stopper is ever removed, the vial becomes an open container and should not be kept for a later application.

Step by step for clinics: vial handling and dispensing. Storage after the first draw: how long does an opened vial last?

Professionals' questions on format, sealing and use are collected in the professional FAQ. More guides: Beauty Science knowledge.