Hair Serums

About

Salon-Quality Hair Serums for Every Hair Type and Concern A good hair serum does more than add shine. Depending on the formula, it can tame frizz, protect against heat, smooth the cuticle, add definition, or deliver a targeted dose of repair exactly where it is needed. The key is finding the right serum for your hair type and primary concern. Our hair serum range covers the full spectrum of hair needs, from lightweight frizz-control formulas to colour-protecting treatments and leave-in heat shields. Each is developed at our facility in Parma, Italy, using sustainably sourced ingredients, and is trusted by salons across the UK. The Best Hair Serum for Frizzy Hair Frizz-prone hair needs a serum that seals the cuticle and keeps humidity out. OI All In One Milk is our most versatile option for frizzy hair. It's a lightweight, multi-benefit serum-milk that hydrates, smooths, and forms a humidity-resistant layer on each strand without heaviness or residue. For a broader view of frizz-controlling products that work alongside a serum, explore the full frizzy hair collection . Hair Serums for Dry Hair Dry hair benefits most from serums that focus on moisture retention and cuticle repair. OI Oil , built around roucou oil, smooths the cuticle and adds a deep shine without heaviness. It works both as a pre-wash treatment and a finishing serum applied to dry hair for instant luminosity. For hair that feels dry and dull, OI Liquid Luster is a conditioning serum that delivers an immediate boost of shine and softness, leaving hair looking healthy and polished. Those with dry or dehydrated hair will also find a wide range of moisture-focused products in the dry hair collection . Hair Serums for Heat Protection Heat styling without protection causes cumulative damage over time, and a serum is one of the most practical ways to build thermal defence into your daily routine. OI All In One Milk provides significant heat protection as well as frizz control, making it an efficient choice f