Leave-in / Everyday leave-in, medium-weight
Scent:
The ingredient list declares fragrance. What it smells of is not stated, and we do not guess.
Manufacturer page: ouidad.com
Personal fit
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The rest of what your plan weighs on this product.
The consultation builds your hair profile, then reads every factor in this table against it — and tells you where this product fits, or what to use instead.
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Your avoid-list
Upper-mid price for a leave-in
$3.06/oz at 8.5 oz — more than 57% of the 477 leave-ins , which mostly run $1.17–5.50/oz. The cost less.
Great for
Maybe skip if
What the formula actually does
Each row says where it comes from: F means we derived it from this product’s own ingredient list, S means it is a claim the brand makes that the formula neither confirms nor contradicts.
Middle of the range — noticeable on fine hair, light on coarse hair.
Conditioning agents are present, lower in the list.
Humectants in the working part of the formula.
Oils sit high in the list — a softening, coating formula.
Protein high in the list — a strengthening formula, not a moisture one.
Nothing here needs a detergent wash to remove.
Fragrance is listed; it sits below the working ingredients.
Ingredients that matter
The workhorse ingredients plus anything lower down that changes a decision. These chips name what an ingredient does — they are not safety scores, and no ingredient here is rated good or bad on its own.
| Ingredient | What it does | Why it matters | Chip |
|---|---|---|---|
| WaterWater/Aqua/Eau | solvent | The base everything else is dissolved in | Neutral |
| Pisum Sativum (Pea) Peptide | protein | Firms up soft, over-stretchy hair | Protein |
| Biotin | vitamin | A marketed vitamin addition | Neutral |
| Niacinamide | vitamin | A marketed vitamin addition | Detangles |
| Borago Officinalis Seed Oil | oil | Coats and softens the strand | Softens |
| Cannabis Sativa Seed Oil | oil | Coats and softens the strand | Softens |
| Glycine Soja (Soybean) Oil | oil | Coats and softens the strand | Softens |
| Linum Usitatissimum (Linseed) Seed Oil | oil | Coats and softens the strand | Softens |
| Hexyl Cinnamal | fragrance | The scent | Fragrance |
| Limonene | fragrance | The scent | Fragrance |
| Linalool | fragrance | The scent | Fragrance |
| FragranceFragrance (Parfum) | fragrance | The scent | Fragrance |
US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order. Annotations keep three readings separate: the ingredient's general function, its role in this product type, and what its position can support.
The base of almost every rinse-off and cream hair product. It carries everything else and is normally the first ingredient on the label.
Listed in the first three ingredients, it is likely a structural part of this formula.
A short-chain pea protein used for strength and body claims in vegan formulas.
Listed in the first three ingredients, it is likely a structural part of this formula.
A large surface-depositing protein. If protein reliably makes your hair feel rigid, this is the form most likely to do it.
Unhydrolysed protein is too large to enter the strand. It sits on the surface, which is a coating effect rather than internal reinforcement.
Vitamin B7, included for label appeal in thickening and growth-positioned products. Applied to hair it does not reach the follicle.
Listed in the first three ingredients, it is likely a structural part of this formula.
Vitamin B3, used in scalp products for conditioning claims.
Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
Deposits a lubricating layer that makes combing easier, which is most of what stops mechanical damage adding to frizz.
The oil pressed from Borago Officinalis. How much weight a plant oil leaves depends on the hair it lands on; coarse hair tends to take more of it than fine hair.
Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
Coats the surface and slows water leaving the strand, which is usually what coarse hair that dries out fast is missing.
A thin oil layer lowers friction between strands and flattens the raised cuticle that scatters light and catches on its neighbours.
Near the top of a list an oil is weight before it is anything else, and fine hair shows that first at the roots.
The oil pressed from Cannabis Sativa. How much weight a plant oil leaves depends on the hair it lands on; coarse hair tends to take more of it than fine hair.
Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
Coats the surface and slows water leaving the strand, which is usually what coarse hair that dries out fast is missing.
A thin oil layer lowers friction between strands and flattens the raised cuticle that scatters light and catches on its neighbours.
Near the top of a list an oil is weight before it is anything else, and fine hair shows that first at the roots.
A light plant oil used to soften and carry other oil-based ingredients.
Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
Coats the surface and slows water leaving the strand, which is usually what coarse hair that dries out fast is missing.
A thin oil layer lowers friction between strands and flattens the raised cuticle that scatters light and catches on its neighbours.
Near the top of a list an oil is weight before it is anything else, and fine hair shows that first at the roots.
Flaxseed oil, used for softness; the seed extract is used instead for natural hold.
Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
Coats the surface and slows water leaving the strand, which is usually what coarse hair that dries out fast is missing.
A thin oil layer lowers friction between strands and flattens the raised cuticle that scatters light and catches on its neighbours.
Near the top of a list an oil is weight before it is anything else, and fine hair shows that first at the roots.
A thickening polymer that gives creams and curl products their bounce and helps them cling to the strand.
Lower in the ordered portion of the list, it is more likely playing a supporting role than defining the formula.
Cationic polymers hold a curl loosely and stay soft, which is why they turn up in definition products rather than firm-hold ones.
A cationic polymer stays on the hair through rinsing, which is what keeps static and combing friction down after the wash.
Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.
A positively charged conditioning polymer. It leaves a thin film that cuts static and eases combing, and it survives rinsing better than a simple conditioner.
Lower in the ordered portion of the list, it is more likely playing a supporting role than defining the formula.
Cationic polymers hold a curl loosely and stay soft, which is why they turn up in definition products rather than firm-hold ones.
A cationic polymer stays on the hair through rinsing, which is what keeps static and combing friction down after the wash.
Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.
A plant sugar used for light moisture and as a prebiotic scalp claim.
Lower in the ordered portion of the list, it is more likely playing a supporting role than defining the formula.
Hydration with no oil attached, so it adds very little weight even high on a list.
Aloe is mostly water carrying sugars that bind more of it, which is why it turns up as the base of moisture-first formulas.
A humectant follows the air: it holds water in humid conditions and can give it up in very dry ones. Climate decides what it does more than the label does.
Sugar-and-fat molecules used as gentle, fermentation-derived emulsifiers and cleansers.
Lower in the ordered portion of the list, it is more likely playing a supporting role than defining the formula.
Emollients fill and smooth the surface of the strand, which lowers the friction that lifts the cuticle and reads as roughness.
Fat-and-water-loving lipids that help conditioning ingredients bind evenly to the strand.
Lower in the ordered portion of the list, it is more likely playing a supporting role than defining the formula.
Emollients fill and smooth the surface of the strand, which lowers the friction that lifts the cuticle and reads as roughness.
A positively charged conditioning agent. Damaged hair carries a negative charge, so it deposits where the damage is and makes wet hair comb through.
Lower in the ordered portion of the list, it is more likely playing a supporting role than defining the formula.
A cationic conditioning agent: it binds to the damaged, negatively charged parts of the cuticle and lowers combing friction there.
The class that does the detangling in a conditioner. It deposits lubrication where the cuticle is worn.
Substantive by design. A routine with no detergent wash gives it nothing to leave with.
A positively charged conditioning agent. Damaged hair carries a negative charge, so it deposits where the damage is and makes wet hair comb through.
Lower in the ordered portion of the list, it is more likely playing a supporting role than defining the formula.
A cationic conditioning agent: it binds to the damaged, negatively charged parts of the cuticle and lowers combing friction there.
The class that does the detangling in a conditioner. It deposits lubrication where the cuticle is worn.
Substantive by design. A routine with no detergent wash gives it nothing to leave with.
A gentle preservative helper that also holds a little moisture.
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
Humectants bind water into the strand, and water — not oil — is what makes dry hair flexible instead of brittle.
A humectant follows the air: it holds water in humid conditions and can give it up in very dry ones. Climate decides what it does more than the label does.
A jasmine-like fragrance component named separately as a recognised allergen.
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
One of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.
A citrus-smelling fragrance component that EU rules require to be named separately because some people react to it.
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
One of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.
A floral fragrance component listed separately as a recognised contact allergen.
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
One of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.
An undisclosed blend of scent ingredients. Regulations let it stay unlisted, so a fragrance-free product is the only way to be certain what is not in it.
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
Declared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.
Ingredient list captured 2026-08-23. Formulas change — check the package in your hand when an ingredient matters to you.
Price · 8.5 oz
Priced above the products that do the same job. Stores sell it above the $11 line; products that do this job typically go for about $26 at this size.
Sorted by price per ounce. Dated observations from our research, not live prices. Direct store pages, no affiliate links. We don’t sell this product.
Formula
A complete read of the format at an ordinary price: mid-range per ounce among leave-ins, with the working systems present.
The formula score is completeness for the job: the share of the systems this product type is normally built around that we can find in this list, weighted. It is not efficacy, not quality, and it never compares across product types.
Does the same job, for less
Same derived functions — what it cleans, conditions, coats or holds — at a lower cost per ounce. Scent, texture and where you buy it can still differ.
See more alternatives in the product library
These are functional neighbours, not personal recommendations — they are close on formula, not chosen for anyone. Get the one that fits your hair, routine, and budget
Final decision
Soft, over-stretchy hair, looking for protein high in the formula and a curly-method-compatible formula
Worth skipping for anyone sensitive to fragrance, hair that stiffens on protein, or people shopping on a budget
Hask Biotin Boost 5-in-1 Leave-in Spray — for similar results at a lower price
We do not sell products or take placement fees. This page states what the formula and the prices show; the consultation is what matches it to a person.
Claims check
Claims are quoted from the brand. We only mark one supported, partly supported, or conflicting when the ingredient list actually speaks to it; everything else stays "stated by the brand", which is not a criticism — most claims simply cannot be read off a label.
Lightweight, multi-purpose serum that hydrates the scalp and hair while enhancing curl definition
Humectants or rich emollients sit in the first eight ingredients.
Helps hair feel hydrated.
Provides weightless moisture while also helping to strengthen curls and balance the scalp
Humectants or rich emollients sit in the first eight ingredients.
Helps hair feel hydrated.
We look at the first 10–15 ingredients and what they do in a formula — not marketing. If the list doesn't speak to a claim, we don't assume.
Reviewers
Recurring themes our researchers wrote in their own words from sourced reviews. We do not store or scrape star ratings.
Lightweight formula suits fine curls without feeling too heavy
Hydrates curls with bounce and definition without a greasy finish
No residue or buildup — hair feels clean after use
