Davines
OI Shampoo and Conditioner 1L Pro Duo
Professional Roucou Oil System for Shine and Softness
Committed to OI. This is how you buy it.
OI Shampoo + Conditioner in 1000ml — same Roucou Oil formula we use on every Moda client, best cost per wash, cumulative result that builds over 4–6 weeks.
- Hydration
- Frizz control
- Shine
- Cleanse + Condition
Sulfate-Free · Colour-Safe · Vegan · Made in Italy · Professional Size 1000ml
This is probably for you if…
- Committed OI users washing 3+ times per week who are tired of restocking smaller bottles
- Anyone wanting the backbar formula at home consistently
- Families sharing OI across multiple people
- Clients wanting pump dispensers for a professional dispensing setup
In stock + ready to ship
Unopened + unused items may be eligible for exchange or store credit within 14 days. Returns policy
- Free shipping $100+Canada + U.S. · duties included
- Packed by ModaBowmanville, Ontario
- Earn Inner CirclePoints on eligible orders
Use it with
Complete the routine.
A simple system layered for your hair.
-
01 Cleanse + Condition OI Shampoo and Conditioner 1L Pro Duo
Committed to OI. This is how you buy it.
You are here -
04 Prep OI All In One Milk - Multi-Function Leave-In for Detangling Shine and Heat Protection
Detangles. Protects to 230°C. Roucou Oil soft...
Add the full routine.
$490.00$404.00You save $86.00
What it does
- Same formula as the Moda backbar — identical to retail sizes
- Significantly lower cost per wash than restocking smaller bottles
- Optional pump dispensers — eliminates waste, consistent dosing every use
- Roucou Oil builds cumulatively — baseline hair quality shifts over 4–6 weeks
Perfect for
- All hair types — fine
- Medium
- Thick
- Colour-treated
How to use
- Apply one pump of OI Shampoo to scalp and roots — massage gently, rinse through lengths.
- Apply one pump of OI Conditioner to mid-lengths and ends — leave 3–5 minutes.
- Rinse with cool water to seal the cuticle.
- Follow with OI All In One Milk on towel-dried hair and OI Oil after blowdrying.
Routine step
Why we like it
The Moda Team Review
The 1L Pro Duo is what we use at the Moda backbar — same formula, same Roucou Oil concentration, same performance as the retail sizes. We carry it because clients who wash three or more times a week are throwing money away restocking 250–280ml bottles. The cost per wash drops significantly at 1000ml and the pump dispensers make consistent dosing effortless.
Read full stylist notes
The client who has been on OI for six months and goes through her 250ml shampoo in under five weeks. The 1000ml is the obvious upgrade — same formula, better economics, fewer reorders. Davines is B-Corp certified, family-owned, made in Italy. The OI 1000ml Pro Duo is the same formula we use behind the Moda chair — the professional-size version of the line that consistently outperforms expectation over weeks of committed use.
Moda
What’s inside — and why it’s there
The ingredients worth knowing.
- Roucou Oil — Amazonian Achiote plant. Same formula used on every Moda client. Identical to the retail sizes. Shampoocreamy lather, softening, shine. Conditioner: award-winning, silky cream, anti-frizz, all hair types. Persistent OI fragrance.
View full ingredient list
Refer to individual product packaging for the most current ingredient list.
How to use
Use it the way we would.
- Apply one pump of OI Shampoo to scalp and roots — massage gently, rinse through lengths.
- Apply one pump of OI Conditioner to mid-lengths and ends — leave 3–5 minutes.
- Rinse with cool water to seal the cuticle.
- Follow with OI All In One Milk on towel-dried hair and OI Oil after blowdrying.
Moda stylist tipOne pump of shampoo and one pump of conditioner per wash — pump dispensers prevent the over-dispensing that is easy to do from 1L bottles. The cumulative Roucou Oil result that builds over 4–6 weeks is the version clients describe as having permanently changed their hair.
Reviews
Questions? We get them.
Good to know.
The questions we hear most about this product. If yours isn’t here, a real stylist will answer.
Ask ModaIs the Davines OI Pro Duo 1L the same formula as the standard sizes?
Yes — identical formula, professional size. The 1000ml is the same Roucou Oil concentration we use at the Moda backbar. The only difference is packaging and cost per wash, which is significantly better in the litre format.
How long will the OI Pro Duo 1L last?
At standard amounts per wash, each litre gives approximately 50–65 washes. For someone washing three times a week, that is four to five months per bottle.
Do the 1L bottles come with a pump?
The 1L bottles have a standard screw cap — no pump included. Standard 28mm bottle pumps fit most professional-size Davines bottles and make dispensing much easier.
Is the OI Pro Duo better value than buying the 250ml sizes separately?
Yes — the Pro Duo is priced at a meaningful saving per wash versus the retail sizes. The more frequently you wash, the faster the saving compounds. For families sharing products, it is the most efficient way to run the OI system.
Can I add OI Oil or All In One Milk alongside the Pro Duo?
Yes — the Pro Duo covers wash and condition. OI All In One Milk as a leave-in before blowdrying and OI Oil as a finishing step complete the four-step routine. Both are available individually on the Moda site.
Works with this
Works with this.
Returns
Unopened + unused products may be eligible for exchange or Moda store credit within 14 days.
Returns policy
Need help choosing?
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