Every professional brand has one line that outgrows the salon shelf and becomes the thing people ask for by name. For Davines, that line is OI. Built around roucou oil, from a plant native to the Amazon, OI promises one thing across every format — extraordinary softness, shine, and body — and wraps it in the scent people can't stop mentioning. But the line now spans a shampoo, a conditioner, a milk, an oil, a butter, a foam, and a liquid treatment, and they are not interchangeable. This is the complete guide: what each OI product actually does, who it's for, and how to build them into one routine.
What Is Davines OI — and What Is Roucou Oil?
OI is Davines' softness-and-shine line, and its signature ingredient is roucou oil, extracted from a plant native to the Amazon. In many of its formats, Davines pairs it with rich, milky textures designed to soften strands and protect them — the shampoo's formula, for instance, is built to shield hair from harsh UV radiation while it softens. OI is not a treatment line for a scalp condition or a repair system for chemical damage; it is an everyday beautifying line, for all hair types, whose job is to make hair feel silkier, look glossier, and behave better. That focus is exactly why it became Davines' calling card.
One practical note before the products: OI formats overlap on purpose. The right question isn't "which one is best?" but "which texture does my hair want?" — a rinse-off pair, a light leave-in, an oil, or a butter. Browse the full Davines OI collection as you read.
The Wash: OI Shampoo and OI Conditioner
The OI Shampoo (Absolute Beautifying Shampoo, 90ml ₱850 / 280ml ₱1,650) is an ultrahydrating, milky-smooth cleanse for all hair types — softness, shine, and body from the first step. It is paraben- and sulfate-free, and its roucou-oil formula is designed to protect hair from harsh UV radiation — a quietly useful trait in our climate. Proof of its timelessness? It earned Refinery29’s "Go-To Shampoo" title back in 2015 and has remained a staple in top salons ever since.
The OI Conditioner (250ml, ₱1,800) is the rich, buttery second step. Beyond softness and detangling, its formula is designed to protect against UV, heat from blow dryers and straighteners, and everyday mechanical stress — and it helps hair dry faster after cleansing, which anyone who air-dries will appreciate. If you buy only two OI products, this pair is the foundation.
The Famous Leave-In: OI All in One Milk
If one product explains OI's cult status, it is the OI All in One Milk (50ml ₱880 / 135ml ₱1,800). It is a leave-in spray with a genuinely long benefits list — Davines counts shine, softness, detangling for wet and dry hair, frizz control, conditioning, body without weight, moisture, easier blow-drying, heat protection, and a longer-lasting style. In practice: mist it through towel-dried hair, comb, and everything after gets easier. It suits all hair types, and for fine hair it is the safest OI leave-in because it conditions without heaviness.
The Icon: OI Oil
The OI Oil (20ml ₱850 / 50ml ₱1,400 / 135ml ₱2,350) is, by Davines' own account, the number-one product in its entire portfolio — launched at Cosmoprof in 2011 and unbeaten since. It is a finishing potion that instantly tames frizz, adds shine and softness, and brings strong detangling and restructuring properties, with roucou oil protecting against hair aging and breakage. Use two to four drops on damp mid-lengths and ends before drying, or a single drop smoothed over dry hair as a gloss. Thick, frizzy, or coarse hair can go heavier; fine hair should start with one drop, ends only.
The Deep Nourisher: OI Hair Butter
OI has no product named "mask" — the OI Hair Butter (75ml ₱880 / 250ml ₱2,050) is the line's deep-nourishment step, and it plays that role. An antioxidant butter with the line's signature sensory scent, it delivers an anti-frizz disciplinary action with immediate softness and brightness. Use it two ways: as a weekly treatment — a generous layer on damp hair for a few minutes before rinsing — or as a styling balm, a fingertip's worth warmed in the palms and pressed into dry, thirsty ends. Thick and frizz-prone hair gets the most from it; very fine hair should stay with the Milk.
The Newer Additions: OI Liquid Luster and OI Soufflé
Two newer formats round out the line for specific jobs. The OI Liquid Luster (100ml, ₱1,250) is a shine treatment with a water-like liquid texture: for hair that has gone dull, drab, or limp, it moisturizes and leaves hair glossy and soft in seconds — Davines pitches it as a wow-effect treatment, and the texture really is closer to water than to oil. The OI Soufflé (125ml, ₱1,950) is a silkening, bodifying liquid-to-foam leave-in built for fine hair: roucou oil plus chicory root extract for body and shine without weight, with Davines reporting hair up to 2.3× shinier with continued use. If the Oil feels too rich and the Milk too familiar, the Soufflé is the fine-hair answer.
And because devotees always ask: the line extends beyond haircare — a body wash carrying the signature OI fragrance, plus a hand balm and a lip kit — and the OI gift sets bundle the hero products at a saving. All of it lives in the OI collection.
Which OI Do You Actually Need?
| Your hair / your goal | Your OI | How to use it |
|---|---|---|
| Everyone — the foundation | OI Shampoo + OI Conditioner | Every wash; sulfate-free cleanse, buttery condition |
| All types — one leave-in that does everything | All in One Milk | Mist on towel-dried hair, comb through |
| Frizz, dullness, thick or coarse hair | OI Oil | 2–4 drops damp, 1 drop dry to gloss |
| Very dry, thirsty, frizz-prone hair | Hair Butter | Weekly rinse-off treatment or a fingertip on dry ends |
| Dull, limp hair needing instant shine | Liquid Luster | Fast liquid treatment for gloss in seconds |
| Fine hair wanting body + shine | OI Soufflé | Liquid-to-foam leave-in, light by design |
A simple full routine, in order: OI Shampoo → OI Conditioner → All in One Milk on towel-dried hair → then either the Oil (normal to thick hair) or the Soufflé (fine hair) — with the Hair Butter as the weekly deep-nourish step and Liquid Luster as the before-an-event glosser. You do not need all seven; two or three, matched to your hair, is the point.
OI earned its reputation one bottle at a time — the award-winning shampoo, the portfolio-topping oil, the leave-in milk that does ten jobs. Match the texture to your hair, commit to the routine, and the line delivers exactly what it promises: softness and shine you can see across the room. Start with the Davines OI collection at HairMNL — and if you're weighing OI against the rest of the brand, the wider Davines range is a browse away.
