There are two categories of serums: water-based and oil-based. Water-based intensively nourishes the inner layer of the skin due to its tiny molecule size, whilst the oil-based ones can go on top of your chosen moisturiser due to its bigger molecules.

A water base is definitely friendlier to oily and combination skin types, whilst oil-based really benefits dry skin. Both are really effective when it comes to locking up the moisture of whatever goes underneath.

All serums, however, are made for daily application. As some formulas can definitely sensitise skin, it's recommended to follow-up with a proper sunscreen. Before applying any product, make sure to read the label and follow through the instructions after test-patching accordingly.

From around 25 years old our skin starts demonstrating a bit more of its ageing process – by that time, a more elaborate skincare routine may already have been started and this would be a good time to invest in a high quality serum to introduce into it.

Moisturisers also contain powerful hydration properties – however, they don’t work from the inside out. Their effect tends to concentrate on the outer layers of your skin where they can sit and hold moisture in, which makes them totally different from serums. A serum is designed to go deeper inside the skin layers to have its targeted benefit.

Boosters are almost like a treatment serum, however they are meant to be incorporated into your current skincare routine and added into another product like a moisturiser instead of being the foundation of it all. You should use as and when you need them, not necessarily include them as a mandatory daily step.