Dermatologist Tested
A brand-run study. We report it as stated and do not repeat the number as fact.
—
Stated by brand
Only the brand’s testing shows this.
Sienna Naturals
D.N.A. Scalp Serum for Thinning Hair
Scalp treatment
- Scalp treatment
- serum
- Sulfate-free
- Silicone-free
- Vegan · label states
- Cruelty-free · label states
Add it to your products. We’ll tell you if it’s ever recalled.
Scent:
No added fragrance, no scenting essential oils, and no declared fragrance allergens on the list.
“No added fragrance, but reminiscent of fresh herbs” (Brand page)
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 20 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
Slip / detangling
Little
Not in your profile
Weight on hair
Light
Not in your profile
Fragrance
None listed
Not in your profile
Protein
None
Not in your profile
Silicone / wax buildup
None
Not in your profile
Clarifying wash needed
Moderate
Not in your profile
Scent
Unscented
Not in your profile
Parabens / preservatives
None of these listed
Not in your profile
Show all 20 factors we check
The rest of what your plan weighs on this product.
Essential oils
None listed
Not in your profile
Fast-drying alcohol
None
Not in your profile
Vegan / cruelty-free
Vegan · label statesCruelty-free · label states
Not in your profile
Animal-derived ingredients
Vegan · label states
Not in your profile
Heavy humectants
Heavy
Not in your profile
Hard-water defence
High
Not in your profile
UV filter
None listed
Not in your profile
Ingredient list
30 ingredientsAbout average
Not in your profile
Price tier
Salon
Not in your profile
Where to buy it
Brand website · Specialty beauty
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
Same job for less elsewhere
$42.00/oz at 1 oz, more than 95% of the 280 scalp treatments , which mostly run $3.84–19.05/oz.
Great for
no fragrance (parfum) on the label
free of strong smells
Protein-sensitive hairthat stiffens when protein is added
Dry, thirsty hairhumectants and emollients both sit up front
Fine hairthat flattens under most products
Silicone-free routinesno silicones appear in the list
Maybe skip if
Dry or very humid airwhere heavy humectants work against you
Tight budgetsit sits in the upper price tiers
If scent matters to younothing is added here
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.
Slip and detangling
Little
Nothing here is built to reduce combing force.
Oils and butters
Present, high in the list
Oils sit high in the list: a softening, coating formula.
Weight on the hair
Light
Water-first and light: unlikely to flatten fine hair.
Water-binding (humectants)
High
Humectants near the top: binding water is one of its main jobs.
Protein
None
No protein or amino acids in the list.
Needs detergent to remove
No
Nothing here needs a detergent wash to remove.
Hard-water defence
Chelators present
Contains chelators, which bind hard-water and pool minerals.
Fragrance
None listed
No fragrance is listed.
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 |
|---|---|---|---|
| WaterWater (Aqua) | solvent | The base everything else is dissolved in | Neutral |
| Butylene Glycol | humectant | Pulls water into the hair | Moisturizes |
| Heptyl Glucoside | nonionic cleanser | — | Cleanses |
| Glycerin | humectant | Pulls water into the hair | Moisturizes |
| Helianthus Annuus (Sunflower) Seed Oil | oil | Coats and softens the strand | Softens |
| Biotin | vitamin | A marketed vitamin addition | Neutral |
| Curcuma Longa (Turmeric) Root Extract | botanical extract | A trace plant extract | Stabilizes |
| Aloe Vera Callus ExtractAloe Vera Callus Extract (Stem Cell) | antioxidant | Protects the formula | Detangles |
| Caffeine | active | A secondary active | Active |
| Phenethyl Alcohol | preservative | Keeps the product from spoiling | Fragrance |
What the list leaves out, and what it carriesNo sulfates, silicones, or drying alcohols. Protein-free: this is built for moisture rather than for strengthening. Chelators for hard water. Recorded as vegan and cruelty-free.
Full ingredient list (30)
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
Water
· Water (Aqua)
General function
The base of almost every rinse-off and cream hair product. It carries everything else and is normally the first ingredient on the label.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
- solvent
-
2
Butylene Glycol
General function
A light humectant and carrier that helps extracts dissolve.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
PubChemMay suitFine or easily flattened hairLight and water-binding rather than oily, so it adds less weight than oils or butters do.
May suitVery dry or highly damaged hairA small water-binding solvent. It holds moisture and helps the rest of the formula spread evenly over the strand.
DependsClimate-sensitive or frizz-prone hairA 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.
- humectant
- solvent
-
3
Heptyl Glucoside
General function
A very mild sugar-derived cleanser used in low-foam formulas.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
PubChemMay suitDry, coarse, or high-porosity hairMild cleansing leaves more surface lubrication in place on hair that dries out quickly.
May suitVery dry or highly damaged hairA sugar-derived non-ionic detergent, among the gentlest in use. It cleanses with little foam of its own and little sebum removal.
May not suitBuild-up-sensitive routinesGentle cleansing leaves water-insoluble deposits largely in place; they come off with a stronger wash, not this one.
- nonionic cleanser
- cleanser
-
4
Glycerin
General function
Glycerin, also called glycerol, attracts moisture and mixes completely with water.
Supporting ingredientListed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
Scientific ReportsMay suitDry, coarse, or high-porosity hairHigh-porosity hair loses water fast; a humectant holds some of it in place for longer than the wash itself would.
May suitVery dry or highly damaged hairBinds water into the outer layers of the strand, and water is what makes dry hair flexible again rather than brittle.
DependsClimate-sensitive or frizz-prone hairWater moves both ways. Measured across concentrations, glycerin solutions give water up in some conditions and take it from the air in others. What it does for you depends on how much of it is there and on the air around it.
- humectant
-
5
Helianthus Annuus (Sunflower) Seed Oil
General function
A light, widely used oil that softens without much weight.
Supporting ingredientListed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
International Journal of TrichologyMay suitDry, coarse, or high-porosity hairCoats the surface and slows water leaving the strand, which is usually what coarse hair that dries out fast is missing.
May suitFrizz-prone, damaged, or high-friction hairA thin oil layer lowers friction between strands and flattens the raised cuticle that scatters light and catches on its neighbours.
May not suitFine or easily flattened hairNear the top of a list an oil is weight before it is anything else, and fine hair shows that first at the roots.
- oil
- emollient
-
6
Biotin
General function
Vitamin B7, included for label appeal in thickening and growth-positioned products. Applied to hair it does not reach the follicle.
Supporting ingredientPubChemListed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
- vitamin
- ▾Below about here, the order stops meaning much. These are usually used at 1% or less.
-
7
Curcuma Longa (Turmeric) Root Extract
General function
Turmeric extract, used at low levels for antioxidants and scalp claims.
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.
- botanical extract
- antioxidant
-
8
Aloe Vera Callus Extract
· Aloe Vera Callus Extract (Stem Cell)
- antioxidant
- botanical extract
- conditioning agent
- humectant
-
9
Caffeine
- active
-
10
Rosmarinus Officinalis (Rosemary) Flower/Leaf/Stem Extract
- botanical extract
- 11 Hydrolyzed Walnut Extract
-
12
Larix Europaea Wood Extract
- botanical extract
-
13
Sodium Metabisulfite
- antioxidant
- preservative
- 14 Vitis Vinifera Fruit Meristem Cell Culture
-
15
Potassium Sorbate
- preservative
-
16
Sodium Benzoate
- preservative
-
17
Phenethyl Alcohol
General function
A rose-scented alcohol that acts as both a mild preservative and a fragrance note.
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 routinesDeclared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.
- preservative
- fragrance
-
18
Citric Acid
General function
Used to bring the product to a slightly acidic pH, which helps the cuticle lie flat. It is almost always near the end of the list.
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.
International Journal of TrichologyMay suitBuild-up-sensitive routinesHolds hard-water minerals in solution so they rinse away instead of depositing on the hair.
May suitFrizz-prone, damaged, or high-friction hairThe acid side of pH adjustment, and the reason it matters is measured: alkaline formulas raise the fibre's surface negative charge, increase friction between strands and lift the scales, while lower-pH ones do the reverse.
May suitGray, silver, or brass-prone hairWhere a warm cast comes from water minerals rather than from the hair itself, holding those metals in solution is what removes it.
- pH adjuster
- hard-water chelator
-
19
Camellia Sinensis (Green Tea) Leaf Extract
· Camellia Sinensis Leaf Extract
- botanical extract
- antioxidant
- 20 Hydrolyzed Eruca Sativa Leaf
-
21
Zinc Chloride
- preservative
- salt
-
22
Pentylene Glycol
General function
A humectant that also helps preserve the formula, often used where a brand wants a short preservative list.
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 suitFine or easily flattened hairLight and water-binding rather than oily, so it adds less weight than oils or butters do.
May suitVery dry or highly damaged hairA small water-binding solvent. It holds moisture and helps the rest of the formula spread evenly over the strand.
DependsClimate-sensitive or frizz-prone hairA 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.
- humectant
- solvent
- preservative
-
23
Xanthan Gum
General function
A fermented sugar gum that thickens water-based formulas and adds soft, natural hold.
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 suitCurls or waves needing flexible holdA polysaccharide film stays softer than a synthetic one as it dries, which is what leaves a curl defined but still able to move.
May suitFrizz-prone, damaged, or high-friction hairA soft film binds neighbouring strands together, which is most of what helps flyaways lie down.
May not suitMaximum-hold stylingGum films stay soft. A style that needs firm fixation usually wants a synthetic polymer doing the holding.
- gum
- thickener
- film former
-
24
Polyglyceryl-3 Diisostearate
General function
A plant-derived polyglycerol ester. It emulsifies without ethoxylation, which is why it turns up in formulas positioned as PEG-free, and leaves a soft feel.
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 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.
- emulsifier
- emollient
-
25
Caprylhydroxamic Acid
General function
A coconut-derived preservative booster that also binds trace metals.
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 suitBuild-up-sensitive routinesBinds the calcium and magnesium in hard water, which is what stops mineral deposits accumulating on the strand wash after wash.
May suitGray, silver, or brass-prone hairCopper and iron carried in tap water deposit on the strand and read as a dull, warm cast on gray or light hair. A chelator holds those metals in solution so the wash carries them off.
- preservative
- hard-water chelator
-
26
Aloe Barbadensis Leaf Juice
General function
Aloe gel, used for light moisture and slip. High in the list it also contributes a little natural hold.
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 suitCurls or waves needing flexible holdGums thicken and set soft, which gives definition that bends rather than a rigid cast.
May suitFine or easily flattened hairHydration with no oil attached, so it adds very little weight even high on a list.
May suitVery dry or highly damaged hairAloe is mostly water carrying sugars that bind more of it, which is why it turns up as the base of moisture-first formulas.
- humectant
- botanical extract
- gum
- 27 Carthamus Tinctorius (Safflower) Flower Extract
-
28
Hibiscus Sabdariffa Flower Extract
- botanical extract
-
29
Sodium Phytate
General function
A rice-derived chelator that binds hard-water minerals without EDTA.
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 suitBuild-up-sensitive routinesBinds the calcium and magnesium in hard water, which is what stops mineral deposits accumulating on the strand wash after wash.
May suitGray, silver, or brass-prone hairCopper and iron carried in tap water deposit on the strand and read as a dull, warm cast on gray or light hair. A chelator holds those metals in solution so the wash carries them off.
- hard-water chelator
-
30
Phenoxyethanol
- preservative
What the whole list adds up to
- 8 preservatives
- 7 botanical extracts
- 5 humectants
- 4 antioxidants
- 3 solvents
- 3 hard-water chelators
- 2 emollients
- 2 gums
- 1 nonionic cleanser
- 1 cleanser
- 1 oil
- 1 vitamin
- 1 conditioning agent
- 1 active
Ingredient list captured 2026-09-08. Formulas change, so check the package in your hand when an ingredient matters to you.
Price · 1 oz
Seen at
$42
Good value under
$4
Priced above the products that do the same job. Stores sell it above the $4 line; products that do this job typically go for about $7 at this size.
Show the price ladder
Where we’ve seen it1 listing · 1 store
-
Sienna Naturals (siennanaturals.com)
$42.001 oz · $42.00/ozSep 8Lowest per oz
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
- 1 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.
- Seen at $42 is the price we have observed for the 1 oz. We need three stores before we call a price commonly seen.
- Good value under $4 comes from the 8 products we score as doing the same job as this one. A quarter of them cost less than $4.00/oz; at 1 oz that is $4. Under that line you are paying less than most of them.
- About $7 is what those same products typically cost at this size: the midpoint of their prices per ounce, scaled to 1 oz.
Formula
5
Formula score
5 of 10
It costs more per ounce than 95% of the 280 scalp treatments we’ve priced, and 8 formulas we score as close matches cost at least a quarter less per ounce.
How the score is counted
- 8 products we score as doing the same job cost less per ounce
- Costs more per ounce than 95% of the 280 scalp treatments we’ve priced
- No conditioning agents up front in the formula
- Reviewers mention 2 things they like about how it performs
- Conditioning agents up frontWhat makes wet hair comb through.3 pts
- Oils or butters in the working zoneSoftens the strand rather than just coating it.2 pts
- Slip for detanglingReduces the force it takes to comb wet hair.2 pts
- A humectantBinds water into the hair.1 pt
- A pH adjusterBrings the formula to the acidic pH hair prefers.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.
CeremoniaLowest cost per oz
Papaya Scalp Scrub
$4.13/oz $37.87/oz less
- Vegan & CF
- Differs
Pattern BeautyClose function
Scalp Serum
$7.25/oz $34.75/oz less
- Protein-free
- Lightweight
- Silicone-free
- Function
- Also
AlternaClose function
Renewing Scalp Care Hemp Leave-on Treatment
$19.20/oz $22.80/oz less
- Protein-free
- Lightweight
- Silicone-free
- 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?
Good for the right person, not the lowest costBest user
People sensitive to fragrance, for a formula with no added fragrance and a product with no scent
Biggest tradeoff
Not ideal for very dry or very humid climates, people shopping on a budget, or anyone who wants a product to smell of something
Best alternative if not
Ceremonia Papaya Scalp Scrub 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.
0
SupportedBacked by ingredients
0
Partly supportedSome supporting logic
4
Stated by brandNo clear evidence
0
Potential conflictFormula works against claim
90% experienced an increase in hair's density after 8 weeks
A brand-run study. We report it as stated and do not repeat the number as fact.
—
Stated by brand
Only the brand’s testing shows this.
87% noticed hair appeared stronger after 8 weeks
A brand-run study. We report it as stated and do not repeat the number as fact.
—
Stated by brand
Only the brand’s testing shows this.
87% noticed reduction in hair loss/shedding after 16 weeks
A brand-run study. We report it as stated and do not repeat the number as fact.
—
Stated by brand
Only the brand’s testing shows this.
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.
Multiple customers report visible new growth, describing baby hairs and regrowth along the hairline/edges after consistent nightly use.
named customer testimonials featured on the brand's own product pageCustomers dealing with postpartum or hormonal thinning, including fine bleached-blonde hair, report reduced shedding and a fuller feel within a few weeks of use.
customers who identified postpartum hair loss or fine, chemically lightened hairHow 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, 0 retailer, 1 editorial), last checked 2026-09-08.
- Ingredient references are linked for 9 of 12 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 2026-10-07.
