Most people have read about so-called beauty serums. But how should they be used and do they work? Should they be used with moisturisors, or instead of them?

Serums always work better if you use them beneath your normal moisturiser. Experts say you should see some changes in the texture and tone of your skin after about a month, but it will depend on many factors. These include what your skincare program was before using the serum, your lifestyle, diet and other conditions in your lifestyle.

In Britain, one of the industry’s best-kept secrets — serums — are rapidly becoming the new must-haves thanks to a product sold by Boots that is rapidly flying off shelves nationwide.

Sales of No7 Protect and Perfect Serum increased by nearly 2,000 percent with 13 being sold every minute, after it was mentioned by the BBC Horizon TV show as a “wonder cream” that reduces wrinkles.

Dr Barry Cohen, founder of pH Advantage, says: “The molecules in a serum are smaller than that of a traditional moisturiser, and therefore are able to absorb more effectively into the skin’s pores.

“Concentrated ingredients are packed into a serum which can penetrate the skin much quicker and more deeply for an intensive treatment. They can also help to address certain skin problems such as dehydration and dullness.”

It’s always best to consult an experienced practitioner though, before trying out products of this kind.