Beauty Davines OI Line Guide: Roucou Oil Benefits and Product Roles
An educational guide from the Beauty AMZ research team. No hard sell, just what you need to know.
The story of the OI line
Davines created OI around roucou oil from the Amazon rainforest. The line promises absolute beauty for all hair types. Its warm scent and elegant packaging became instantly iconic. Salons worldwide adopted it as a finishing staple. The line has grown to cover shampoo through styling. It remains Davines' most beloved range.
How roucou oil benefits hair
Roucou oil's antioxidants fight free-radical damage from sun and pollution. Beta-carotene supports hair's natural defenses. The oil smooths the cuticle for reflective shine. It also helps prevent the signs of aging hair. The nourishment feels substantial, not superficial. Science supports the traditional use.
Building an OI routine
Cleanse with OI Shampoo two to three times weekly. Condition with OI Conditioner for softness. Apply All in One Milk to damp hair and detangle. Blow dry or air dry as preferred. Finish with OI Oil on dry ends for shine. The routine is simple and reliably effective.
Who the OI line suits best
All hair types can use OI, which is its core promise. Fine hair should favor the milk and tiny oil amounts. Thick hair loves the full layering. Dry hair gets the moisture it craves. Frizz-prone hair finds real smoothing. Scent lovers get a daily luxury moment.
OI vs other luxury hair lines
Oribe offers more styling-focused luxury at higher prices. Kerastase targets specific concerns like damage or blonde. OI focuses purely on shine, softness, and manageability. Davines also leads on sustainability credentials. For uncomplicated beautiful hair, OI is hard to beat. Pick by your priority: repair, styling, or shine.
Recommended Products
These five Davines OI picks cover the iconic oil, the multitasking milk, and the gentle shampoo.
Best for: The iconic OI shine experience.
Davines OI Oil Absolute Beautifying Potion, 4.56 fl oz
- Roucou oil shine
- Iconic luxury oil
- Best value size
- Signature scent
Pros
- Unmatched shine
- Luxurious experience
- Lasts months
Cons
- Luxury price
- Strong scent
- Easy to overuse
Best for: Daily detangling and softness.
Davines OI All in One Milk, 4.56 fl oz
- Leave in detangling milk
- Lightweight
- Softens and shines
- All hair types
Pros
- Excellent detangling
- Weightless feel
- Great daily product
Cons
- Less shine than the oil
- Spray can mist unevenly
- Premium price
Best for: Trying OI Oil or traveling.
Davines OI Oil Absolute Beautifying Potion, 1.69 fl oz
- Travel size OI Oil
- Same luxury formula
- Try size
- TSA friendly
Pros
- Try before full size
- Perfect for travel
- Lower commitment
Cons
- High per ounce cost
- Empties fast
- Tiny bottle
Best for: Sampling the milk or travel use.
Davines OI All in One Milk, 1.69 fl oz
- Travel milk size
- Same detangling power
- Try size
- Compact
Pros
- Good trial size
- Travel friendly
- Same quality
Cons
- Pricey per ounce
- Small for long hair
- Runs out quickly
Best for: The OI routine foundation cleanse.
Davines OI Shampoo, 9.47 fl oz
- Gentle OI shampoo
- Softening cleanse
- All hair types
- Rich lather
Pros
- Luxurious wash
- Hair feels soft
- Preps for OI styling
Cons
- Premium shampoo price
- Needs conditioner after
- Scent strong for some
Ready to Choose?
See our top product picks for oi oil, or jump straight to the head-to-head comparison of the two most popular options.
Roucou oil and the sun: what it does and does not do
Roucou oil, the signature of the Davines OI line, is traditionally used in the Amazon for sun protection, and it does absorb some UV, but cosmetic concentrations are not sunscreen. Treat the OI Oil as a shine and softness product with a mild UV bonus, not as beach protection. For actual sun days, layer a dedicated UV-protectant spray over the oil or wear a hat; the oil alone will not prevent color fade or dryness from a full day outdoors. One genuine benefit: antioxidant-rich oils like roucou help neutralize some free-radical damage from incidental daily sun, the commute and the lunch walk, which is where most cumulative damage happens anyway. Do not apply any oil before intentional tanning of the hair; oiled hair in strong sun cooks faster, the way oiled skin does.
Hot oil treatments with luxury blends: worth it
Gentle warmth improves oil absorption, and the method is the same regardless of price tier: stand the bottle in warm water for five minutes, never microwave it, and apply at a comfortable wrist-tested temperature. With a luxury blend like OI Oil, heat is somewhat wasted money: the formula is already engineered for spreadability and absorption at room temperature, so the marginal gain is smaller than with a thick raw oil. Twenty minutes under a shower cap is the practical maximum; beyond that the returns flatten. Save the hot-oil ritual for thick raw oils that genuinely need help distributing, and use the OI Oil as intended, a small amount on damp hair. If you love the ritual itself, the experience is valid, just know the chemistry gains are modest with an already-optimized blend. For raw oils where heat matters more, our baobab oil guide covers a thicker oil that benefits visibly.
When a luxury blend beats a pure oil, and when it does not
The OI line's price buys formulation: silicones for instant slip, a balanced texture that distributes evenly, fragrance engineered to last, and preservation that keeps every bottle identical. A pure oil buys simplicity and control at a lower cost per milliliter. The blend wins for daily styling, frizz control, and heat-tool prep; the pure oil wins for pre-wash treatments, sensitive scalps, and anyone avoiding fragrance or silicones. The mistake is using the luxury blend as a pre-wash soak, where most of it rinses away, that is the job for a cheap pure oil. Match the product to the job and both earn their place. To compare across the luxury tier, the &Honey vs Gisou showdown tests two other premium oils head to head.