Serums are thinner and lighter than moisturizers and have a greater variety of functions. A serum usually has smaller molecules combined with a high concentration of ingredients designed to penetrate, improve and/or nourish the skin in some way.
A moisturizer's job is to hydrate the skin and prevent water loss

You only need to apply the serum before sleeping. It assists the skin as it repairs and heals itself from the damage done during the day.

Infused with Vitamin E, it provides long-lasting hydration for the skin. It also heals and soothes skin after irritation from the sun and pollution. Thus, serum heals and hydrates skin.

This serum is suitable for all skin types and contains a gentle formula. However, skin may be hypersensitive or allergic to certain ingredients, and therefore it is important to apply the serum on a small part of your body to check if this suits you.
You can also check the ingredient list to check your allergies/hypersensitivities.

This nourishing night-time body serum repairs skin at night. It is enriched with 30x Vitamin E that heals skin from oxidative damage and speeds up cell regeneration. Thus delays the signs of ageing.