Medical-grade vs. over-the-counter skincare: what's the difference?

"Medical-grade" is not a regulated term, which is exactly why it is worth explaining what we mean when we use it. In practice, the difference comes down to three things: what is in the bottle, how it is delivered, and who decided you should be using it.

Concentration and stability

Cosmetic formulations are built for a wide audience, which usually means lower active concentrations and a formula that will not irritate anyone. Clinical formulations use higher, evidence-based concentrations and invest in stabilising them — vitamin C that has not oxidised in the bottle behaves very differently from vitamin C that has.

Delivery

An active that cannot reach the layer of skin where it works is decoration. Encapsulation, pH and vehicle design are where most of the formulation cost sits, and where the visible difference is usually made.

Guidance

The most expensive product is the one you use incorrectly. Prescribing a routine means sequencing actives, staging their introduction and adjusting as your skin adapts. That oversight is the part that cannot be bought off a shelf.