It is done in three to four sessions at two to four week intervals. Hydration is felt between immediately and two weeks, and it disappears as it is absorbed, so repeating is assumed. The moisture-binding ingredient draws and holds water, so the effect lasts only while it is there.

Hydration is felt right after the session and glow rises over two weeks. Moisture fills immediately because the ingredient draws water as soon as it goes in, while glow needs that hydration to hold and the surface to even out, so it comes a little later.

Both belong to the same family aimed at replacing moisture. Both place a moisture-binding ingredient directly into the skin to hydrate from within, and both disappear as they are absorbed and so are repeated. The exact ingredients and blend differ by clinic, so check what goes in rather than the name.