smooths and protects
Silicones or film formers smooth the cuticle, which is the usual mechanism.
- Dimethiconol
- Ethyl Ester Of Hydrolyzed Silk
Supported
Smoother strands, less frizz.
BioSilk
Silk Therapy Original
Finisher / Serum, glossing
- Finisher
- serum
- Sulfate-free
- Moisture-rich
Size2.26 fl oz
Price$13–15commonly seen · 2.26 oz
Price / oz$6.32/ozat 2.26 oz
Where to buy4 stores · $12.49–21.00
Add it to your products. We’ll tell you if it’s ever recalled.
Scent:
The ingredient list declares fragrance. What it smells of is not stated, and we do not guess.
Listing used for research: ulta.com
Personal fit
Is this right for you?
Complete the consultation to see how well this product fits your hair and your goals. With 6,000+ products in our library, we can match you to the right ones.
- About 20 minutes, and your answers save as you go.
- Every product matched against your hair across the 22 factors we check.
- A personalized routine built around your schedule, styling habits, and local weather.
- Find products that do the same job at a lower cost.
- Your goals, scalp, damage history, water, budget, and scent preferences all shape your plan.
$49 with 60 days of follow-up questions and plan updates
$99 with 12 months. Pay once; the year renews only if you choose.
Factor
Your profile
Fit
Best for hair types
All types
Not in your profile
Moisture level
High
Not in your profile
Shine system
High
Not in your profile
Slip / detangling
High
Not in your profile
Weight on hair
Medium
Not in your profile
Fragrance
Prominent
Not in your profile
Protein
Prominent
Not in your profile
Silicone / wax buildup
High
Not in your profile
Clarifying wash needed
Moderate
Not in your profile
Parabens / preservatives
None of these listed
Not in your profile
Show all 22 factors we check
The rest of what your plan weighs on this product.
Essential oils
None listed
Not in your profile
Fast-drying alcohol
Moderate
Not in your profile
Vegan / cruelty-free
Not yet verified
Not in your profile
Animal-derived ingredients
Not yet verified
Not in your profile
Aerosol can
Pump or tube
Not in your profile
Needs heat to set
Air-sets
Not in your profile
Heavy humectants
Not heavy
Not in your profile
Hard-water defence
None
Not in your profile
UV filter
None listed
Not in your profile
Ingredient list
15 ingredientsA short list
Not in your profile
Price tier
Masstige
Not in your profile
Where to buy it
CHI Haircare · Ulta
Not in your profile
The consultation builds your hair profile, checks every factor in this table against it, and tells you where this product fits or what to use instead.
Start your consultation$49 once, with 60 days of follow-up questions and plan updates. Nothing renews, and you never have to buy a product.
Your avoid-list
Priced with its peers
$6.32/oz at 2.26 oz, less than 64% of the 136 serums , which mostly run $3.94–14.80/oz. The cost less.
Great for
Protein-hungry hairthat stretches and stays stretched when wet
Maximum slipfor hair that tangles the moment it is wet
Dry, thirsty hairhumectants and emollients both sit up front
Dull-looking haira recognised shine system is present
Aerosol avoidancea pump or tube, not a pressurised can
A wide range of haira middle-of-the-range weight
Maybe skip if
this product has a scent
Curly-method routinesthese silicones need a detergent to remove
Protein-sensitive hairthat goes stiff or straw-like on protein
Very dry or damaged hairit contains fast-drying alcohol
What the formula actually does
Read from the label, not the marketing
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.
Shine system
Silicone serum
A silicone or oil blend does the shine work here.
Weight on the hair
Medium
Middle of the range: noticeable on fine hair, light on coarse hair.
Oils and butters
None
No oils or butters in the list.
Needs detergent to remove
Yes
Water-insoluble silicones or waxes: a detergent wash is what removes them.
Fast-drying alcohol
Present
Contains fast-drying alcohol, which speeds drying but can leave hair feeling dry.
Fragrance
Prominent
Fragrance is in the first eight ingredients, so it makes up a larger share of the formula.
from the formula
stated by the brand
reported by reviewers
Scale: 1 dot low · 5 dots high, within this product type.
Ingredients that matter
The ingredients that change a decision
The workhorse ingredients, plus anything lower down that changes a decision. The 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 |
|---|---|---|---|
| C13-14 Isoalkane | emollient | Softens and smooths the strand | Shine |
| Dimethiconol | silicone | The shine system | Buildup |
| Isododecane | solvent | The base everything else is dissolved in | Shine |
| Alcohol Denat. | drying alcohol | Speeds drying but can leave hair feeling dry | Drying |
| Panthenol | humectant | Pulls water into the hair | Detangles |
| Ethyl Ester Of Hydrolyzed Silk | conditioning agent | Conditions and softens so hair combs through | Protein |
| FragranceFragrance (Parfum) | fragrance | The scent | Fragrance |
| Alpha-Isomethyl Ionone | fragrance | The scent | Fragrance |
| Benzyl Benzoate | fragrance | The scent | Fragrance |
| Citronellol | fragrance | The scent | Fragrance |
| Eugenol | fragrance | The scent | Fragrance |
| Geraniol | fragrance | The scent | Fragrance |
What the list leaves out, and what it carriesNo sulfates. Protein-forward: a strengthening formula, not a moisture one. Contains fragrance. The silicones here need a detergent wash to come off.
Full ingredient list (15)
In the US, ingredients above 1% are listed from most to least. Below 1% they can appear in any order. Each note keeps three things apart: what the ingredient generally does, its role in this type of product, and what its position can tell you.
-
1
C13-14 Isoalkane
General function
A light carrier that spreads other ingredients and leaves a dry finish.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
May suitFrizz-prone, damaged, or high-friction hairEmollients fill and smooth the surface of the strand, which lowers the friction that lifts the cuticle and reads as roughness.
- emollient
- solvent
-
2
Dimethiconol
General function
A high-shine silicone often paired with dimethicone for a smoother, glossier finish.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
PubChemMay suitClimate-sensitive or frizz-prone hairA surface film slows how quickly humidity reaches the cortex, which is what limits swelling-driven frizz in damp air.
May suitFrizz-prone, damaged, or high-friction hairLays a smooth film along the cuticle, which lowers combing friction and flattens the surface irregularities that read as frizz.
May not suitBuild-up-sensitive routinesDimethicone does not disperse in water. On a routine that skips detergent it stays on the hair and accumulates wash after wash.
- silicone
- emollient
-
3
Isododecane
General function
A fast-evaporating carrier that lets oils and polymers spread thinly, then leaves nothing behind.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
PubChemMay suitFrizz-prone, damaged, or high-friction hairEmollients fill and smooth the surface of the strand, which lowers the friction that lifts the cuticle and reads as roughness.
- solvent
- emollient
-
4
Alcohol Denat.
General function
Fast-drying alcohol used to make sprays set quickly. In leave-on products it can leave hair feeling dry, especially in high position on the list.
Supporting ingredientListed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
PubChemMay suitFine or easily flattened hairEvaporates on contact, which is how a spray sets almost instantly and leaves no weight behind it.
May not suitDry, coarse, or high-porosity hairPorous hair gives water up easily as it is; a fast-evaporating solvent high on the list accelerates that.
May not suitVery dry or highly damaged hairIt evaporates quickly and takes some water with it. On hair already short of moisture, a formula built on a lot of it can finish drier than it started.
- drying alcohol
- solvent
-
5
Panthenol
General function
Provitamin B5. It draws in water and penetrates the strand a little, which is why it is the standard ingredient for softness and shine claims.
Supporting ingredientListed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
PubChemMay suitFine or easily flattened hairIt hydrates without adding oil or a film, which is the combination fine hair usually needs.
May suitFrizz-prone, damaged, or high-friction hairDeposits a lubricating layer that makes combing easier, which is most of what stops mechanical damage adding to frizz.
May suitVery dry or highly damaged hairA humectant that also penetrates the cuticle, so it holds water inside the strand rather than only on the surface.
- humectant
- conditioning agent
- vitamin
-
6
Ethyl Ester Of Hydrolyzed Silk
General function
A protein given a positive charge so it deposits where hair is damaged. It conditions and adds temporary firmness in one ingredient.
Supporting ingredientListed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
May suitFrizz-prone, damaged, or high-friction hairA cationic conditioning agent: it binds to the damaged, negatively charged parts of the cuticle and lowers combing friction there.
May suitMaximum-hold stylingFilm formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.
May suitVery dry or highly damaged hairHydrolysed fragments are small enough to sit in the gaps of a worn cuticle for a wash or two, temporarily restoring stiffness and cutting breakage in combing.
- conditioning agent
- film former
- protein
- hydrolysed protein
- ▾Below about here, the order stops meaning much. These are usually used at 1% or less.
-
7
Fragrance
· Fragrance (Parfum)
General function
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.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
May not suitFragrance-sensitive routinesDeclared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.
- fragrance
- declared fragrance
-
8
Alpha-Isomethyl Ionone
General function
A violet-like fragrance component named separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
9
Benzyl Benzoate
General function
A fragrance component with a faint balsamic scent, named separately on the label because it is a recognised contact allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
10
Citronellol
General function
A rose-like fragrance component named separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
11
Eugenol
General function
A clove-scented fragrance component listed separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
12
Geraniol
General function
A rose-scented fragrance component, listed on its own because some people react to it.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
May not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
13
Hexyl Cinnamal
General function
A jasmine-like fragrance component named separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
14
Hydroxycitronellal
General function
A soft floral fragrance component named separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
15
Linalool
General function
A floral fragrance component listed separately as a recognised contact allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
What the whole list adds up to
- 9 fragrances
- 8 named fragrance allergens
- 3 emollients
- 3 solvents
- 1 silicone
- 1 drying alcohol
- 1 humectant
- 1 conditioning agent
- 1 vitamin
- 1 conditioning agent
- 1 film former
- 1 protein
- 1 hydrolysed protein
- 1 declared fragrance
Ingredient list captured 2026-08-27. Formulas change, so check the package in your hand when an ingredient matters to you.
Price · 2.26 oz
Commonly seen
$13–15
Good value under
$9
Priced above the products that do the same job. Stores sell it above the $9 line; products that do this job typically go for about $16 at this size.
Show the price ladder
Where we’ve seen it4 listings · 4 stores
-
Beauty Depot Online
$12.492.26 oz · $5.53/ozAug 29Lowest per ozSale · was $14.99
-
Supreme Hair & Beauty
$14.292.26 oz · $6.32/ozAug 29Sale · was $19.99
-
brookshires.com
$15.492.26 oz · $6.85/ozAug 29
-
unknown
$21.002.26 oz · $9.29/ozAug 27
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.
How we work this out
- 2.26 oz is the size stores list most often; every comparison on this page is made at it. Other sizes are shown in the Sizes row and the store list.
- Commonly seen is the middle half of current prices for the 2.26 oz at recognised stores. We leave out the cheapest and most expensive quarters, so one sale or one overpriced listing can’t move it.
- Good value under $9 comes from the 8 products we score as doing the same job as this one. A quarter of them cost less than $3.87/oz; at 2.26 oz that is $9. Under that line you are paying less than most of them.
- About $16 is what those same products typically cost at this size: the midpoint of their prices per ounce, scaled to 2.26 oz.
Formula
9
Formula score
9 of 10
The formula carries the systems a serum is built around, and it sits in the middle of the range for serums per ounce.
How the score is counted
- 2 products we score as doing the same job cost less per ounce
- Costs less per ounce than 64% of the 136 serums we’ve priced
- Covers 5 of the 6 things a serum should do
- Reviewers mention 3 things they like about how it performs
- A shine systemThe silicone, oil, or ester that produces gloss.3 pts
- A weightless carrierDelivers the shine without leaving grease.2 pts
- Oils or butters in the working zoneSoftens the strand rather than just coating it.2 pts
- An antioxidantKeeps the oils in the bottle from going off.1 pt
- No drying alcohol in the first threeFast drying without leading on alcohol.1 pt
- Fragrance kept out of the top eightScent as a finishing touch, not a major share.1 pt
The formula score measures completeness for the job: a weighted share of the systems this product type is usually built around that we find in this list. It does not rate how well the product works or its quality, and it never compares across product types.
Does the same job, for less
Formulas that do the same things (cleanse, condition, coat or hold) for less per ounce. Scent, texture and where you buy them can still differ.
CHIFragrance-free
CareOil Aloe Silk Oil Blend
$3.67/oz $2.65/oz less
- Fragrance-free
- Unscented
- Protein
- Function
- Also
SuavecitoLowest cost per oz
Shine Spray
$2.67/oz $3.65/oz less
- Shine
- Vegan & CF
- Function
- Also
See more alternatives in the product library
These products do a similar job. We haven’t matched them to you. Find the one that fits your hair, routine and budget
Final decision
Should you buy it?
A solid pick for the hair it suitsBest user
Soft, over-stretchy hair who want protein high in the formula and real detangling slip
Biggest tradeoff
Worth skipping for anyone sensitive to fragrance, curly-method routines, or hair that stiffens on protein
Best alternative if not
CHI CareOil Aloe Silk Oil Blend 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
What the brand says, and what the formula shows
Claims are quoted from the brand. We mark a claim supported, partly supported or conflicting only when the ingredient list speaks to it. Everything else stays "stated by the brand". That isn’t a criticism: most claims can’t be checked from a label.
3
SupportedBacked by ingredients
0
Partly supportedSome supporting logic
2
Stated by brandNo clear evidence
0
Potential conflictFormula works against claim
all hair types
No formula reads the same on every texture; our fit panel is the better guide.
—
Stated by brand
See the fit panel instead.
helps prevent split ends
Protein sits in the first eight ingredients.
- Ethyl Ester Of Hydrolyzed Silk
Supported
Reinforces a damaged strand.
adds shine
The formula carries a recognised shine system — silicone, oil, or light ester.
- Dimethiconol
Supported
Reflects light for visible shine.
leave-in replenishing treatment
This is a marketing claim; an ingredient list cannot speak to it.
—
Stated by brand
Can’t be confirmed from label.
How to read this
We look at the first 10–15 ingredients and what they do in a formula, not at the marketing. If the list doesn't speak to a claim, we don't assume.
Reviewers
What people report
Themes that come up again and again in sourced reviews, written by our researchers in their own words. We don’t store or scrape star ratings.
A very curly-haired customer uses it daily and says it controls frizz very well.
A customer who applies a few drops after drying says the formula lasts a long time and receives compliments on its scent.
A long-time user says a nickel-sized amount on damp or dry hair makes dry hair soft and shiny, while a little goes a long way.
A reviewer says it works well for thick curly hair after drying but leaves their straight thin hair looking oily and limp.
More from BioSilk
How this page was made
- Everything above comes from our researched product record: identity, the ingredient list as printed, the brand's own claims, dated prices and review themes our researchers wrote in their own words. No part of this page is written by hand for one product.
- The value band is a fixed label over two stored numbers: this product’s cost per ounce as a percentile of every product of this type we have priced, each at the size it is most often sold in, and how many products we score as doing the same job cost at least a quarter less per ounce.
- Both scores out of ten are defined on this page. The formula score is completeness for the job, computed from a fixed per-format checklist shown beneath the gauge; the price score is cost per ounce against every product of this type we have priced.
- The "Is this right for you?" panel reads only your own consultation answers, and it applies exactly the filters our recommendation engine applies. It is computed when you load the page and is never stored on it.
- 2 sources consulted for this product (1 manufacturer or regulatory, 1 retailer, 0 editorial), last checked 2026-08-27.
- Ingredient references are linked for 11 of 15 product-aware annotations on this page. Fit notes are general formulation guidance. They aren’t a verdict on the finished product or on you.
- We haven’t tested this product in a lab, and we don’t physically test your hair. Formula readings come from the ingredient list. Claims about how it behaves are labelled as the brand's.
- Ingredient order tells you relative amount only above roughly 1%. Prices are what we saw on the dates shown and can change.
- Ingredient names link to our ingredient library, where each entry shows what it does, which product types use it, and where it usually sits on a label across everything we have researched.
- This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.
- Formula readings: derivation v23. Record last updated 2026-08-27.
