Is the ordinary an oil or serum?

The Ordinary Hyaluronic Acid 2% + B5

One of King's favorites from the brand, this is a lightweight serum containing different-sized hyaluronic acid molecules that penetrate to different depths. (As we know, hyaluronic acid attracts 1000 times its weight in water.

What is the ordinary face serum for?

This serum emulsion features next generation retinoid actives to improve skin's tone and texture, thereby reducing fine lines and wrinkles, sans the irritation often associated with other retinoids (including retinol). 3 Use a small amount on your face after any water serums but before any heavier treatments.