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Side by side

Act+Acre Stem Cell Scalp Serum vs Bondi Boost Lock Drops Anti-Shedding Scalp & Hair Serum

96% function match · 6 of the 7 functions we compared match Formula overlap 35%. Act+Acre Stem Cell Scalp Serum and Bondi Boost Lock Drops Anti-Shedding Scalp & Hair Serum share 3 ingredients among each other's most prominent.

Based on your consultation

Which of these fits your hair?

We check your pattern, moisture need, scalp, fragrance tolerance, weight sensitivity and more against each formula — and say which one lines up.

Your profile at a glance

  • Your answers appear here
  • Your answers appear here
  • Your answers appear here
  • Your answers appear here

When each one is the right call

What each formula is built for, from its own ingredient list.

  • Lock Drops Anti-Shedding Scalp & Hair Serum — fine hair

Side by side

Every trait, aligned

One row per trait, read from each product’s own ingredient list and record. A dash means we have not researched that field for that product — it is not a “no”.

Trait
Act+Acre Stem Cell Scalp Serum — 2.2 oz container Act+Acre

Stem Cell Scalp Serum

  • Scalp treatment
  • Prestige
Bondi Boost Lock Drops Anti-Shedding Scalp & Hair Serum — 1 oz container Bondi Boost

Lock Drops Anti-Shedding Scalp & Hair Serum

  • Scalp treatment
  • Salon
  • Sulfate-free
  • Silicone-free
Price, size & price per ounce
$86 2.2 oz · $39.09/oz
$30 1 oz · $30.00/oz

Compared at different sizes — 2.2 oz against 1 oz. Per-ounce prices favour the larger bottle.

Value / price positioning
Same job for less elsewhere $$$$$ Prestige tier · costs more than 95% of the 154 scalp treatments we’ve priced
Same job for less elsewhere $$$$$ Salon tier · costs more than 90% of the 154 scalp treatments we’ve priced
Best for hair types
All types Nothing in the formula or the claims narrows this to one pattern. Your hair
All types Nothing in the formula or the claims narrows this to one pattern. Your hair
Moisture level Same
High Humectants near the top — water-binding is a headline mechanism here. Your hair
High Humectants near the top — water-binding is a headline mechanism here. Your hair
Slip / detangling Same
Little Nothing here is built to reduce combing force. Your hair
Little Nothing here is built to reduce combing force. Your hair
Silicone / wax buildup Same
None Nothing here needs a detergent wash to remove. Your hair
None Nothing here needs a detergent wash to remove. Your hair
Clarifying wash needed
Low Your hair
Moderate Your hair
Weight on hair
—
Light Water-first and light: unlikely to flatten fine hair. Your hair
Fragrance
—
Present Fragrance is listed; it sits below the working ingredients. Your hair
Protein
—
Minor Protein appears, low enough to be a supporting ingredient. Your hair
Oils and butters Same
None No oils or butters in the list. Your hair
None No oils or butters in the list. Your hair
Hard-water defence Same
Chelators present Chelators are present — they bind hard-water and pool minerals. Your hair
Chelators present Chelators are present — they bind hard-water and pool minerals. Your hair
Formula completeness
out of 10
A simple formula
out of 10
A simple formula
Who should choose this
—
  • Fine hairthat flattens under most products
  • Silicone-free routinesno silicones appear in the list
  • Very dry hairno fast-drying alcohol in the list
  • Vegan and cruelty-freeour researched record has it as both
Why you might skip it
  • Dry or very humid airwhere heavy humectants work against you
  • Tight budgetsit sits in the upper price tiers
  • Picking it up locallywe have it recorded in one channel only
  • Scents bother youthis product carries a light scent
  • Dry or very humid airwhere heavy humectants work against you
  • Tight budgetsit sits in the upper price tiers
from the formula stated by the brand reported by reviewers Scale: 1 dot low · 5 dots high, within this product type.
More facts about each one
Type
Scalp treatmentserum
Scalp treatmentserum
Where to buy
Brand website
Brand website
Free of
—
  • sulfate-free
  • silicone-free
  • curly-method compatible
Vegan
Vegan · label states
Vegan · label states
Cruelty-free
—
Cruelty-free · label states
Scent
—
Scented, not described
How often
—
as needed

Facts as we recorded them. A dash means we have not researched that field for that product — it is not a "no".

The bottom line

The bottom line depends on your hair

Which of these two suits you is a question about your hair, not about them. The consultation answers it — and tells you what your routine needs around it.

Take the consultation

$49.00 once, for your consultation and hair profile. No subscription, no required purchases.

The detail behind the table

Where the readings above come from: the ingredient lists themselves, each brand’s claims checked against them, what owners report, and cost per ounce in context.

Shared and distinct ingredients

Shared and distinct ingredients

Computed from the ingredient lists as printed. "Shared" means both lists carry it; where it sits on each label is stated, because position is what tells you how much.

What both formulas carry

IngredientStem Cell Scalp SerumLock Drops Anti-Shedding Scalp & Hair Serum
Water
Neutral
#1Leading
#1Leading
Glycerin
Moisturizes
#2Leading
#4Supporting
Butylene Glycol
Moisturizes
#3Leading
#6Supporting
Caprylyl Glycol
Moisturizes
#6Below the 1% line
#8Below the 1% line
Citric Acid
pH balancer
#8Below the 1% line
#23Below the 1% line
Propanediol
Moisturizes
#19Below the 1% line
#3Leading

What only one of them carries

Stem Cell Scalp Serum

  • Aloe Barbadensis Leaf Juice (ALOE)
  • Bambusa Vulgaris Leaf/Stem Extract (BAMBOO)
  • Carbomer

Lock Drops Anti-Shedding Scalp & Hair Serum

Full ingredient list — Stem Cell Scalp Serum (24)
Full ingredient list — Lock Drops Anti-Shedding Scalp & Hair Serum (51)

Claims check

What each brand says, against what each formula shows

Claims are quoted from each brand. We only mark one supported, partly supported, or conflicting when that product’s ingredient list actually speaks to it.

VerdictsStem Cell Scalp SerumLock Drops Anti-Shedding Scalp & Hair Serum
Supported
0
0
Partly supported
0
0
Stated by brand
5
4
Potential conflict
0
0

Stem Cell Scalp Serum

  • 56% less visible hair fall-out in 12 weeksStated by brandOnly the brand’s testing shows this.
  • 86% noticed more hair coverage on the scalp. 85% noticed more volumeStated by brandOnly the brand’s testing shows this.
  • 90% saw new hair growth in 6 weeksStated by brandOnly the brand’s testing shows this.
  • 100% agree product increased hair thicknessStated by brandOnly the brand’s testing shows this.
  • 100% agree hair felt stronger + healthierStated by brandOnly the brand’s testing shows this.

Lock Drops Anti-Shedding Scalp & Hair Serum

  • 100% would recommend for reducing sheddingStated by brandOnly the brand’s testing shows this.
  • 97% saw visible results in under 2 monthsStated by brandOnly the brand’s testing shows this.
  • 92% noticed new baby hairs within 2 monthsStated by brandOnly the brand’s testing shows this.
  • 92% noticed less hair in their brushStated by brandOnly the brand’s testing shows this.

What owners say

What people report

Recurring themes our researchers wrote in their own words from sourced reviews. We do not store or scrape star ratings, and we never balance one product’s themes against another’s by inventing them.

Both praised for a light feel. Bondi Boost Lock Drops Anti-Shedding Scalp & Hair Serum draws complaints about dryness and the scent.

Stem Cell Scalp Serum

Some reviewers say their overall hair shedding and daily hair loss dropped noticeably after starting the serum

reviewers tracking shedding/hair loss

Reviewers also credit it with a healthier scalp overall — less itching, dryness and tightness — alongside the hair-growth effect

reviewers describing scalp feel, not just hair growth

Reviewers repeatedly note the texture is lightweight and does not leave hair greasy, including right at the hairline

reviewers commenting on daily application

Multiple reviewers report visible new hair growth and thicker-looking hair after a few months of consistent use

reviewers using the serum for 3+ months

Lock Drops Anti-Shedding Scalp & Hair Serum

reviewers who liked it describe it as lightweight and fast-absorbing without leaving the scalp greasy

general reviewers

several reviewers with fine or thinning hair say weeks of daily use made their hair feel visibly thicker or fuller

reviewers with fine/thinning hair using it alongside the brand's shampoo/conditioner

a substantial share of reviewers report no visible reduction in shedding or new growth even after a month or two of consistent use

reviewers using it for shedding/thinning over 1-2 months

multiple reviewers describe the fragrance as too strong and report dryness, scalp irritation or allergic-type reactions

reviewers sensitive to fragrance or with sensitive scalps

Price check

Cost per ounce, in context

Cost per ounce against every product of this type we have priced, each at the size it is most often sold in. Value labels are computed from that percentile and from how many products that do the same job cost less; they are comparisons, not judgements about a brand.

$30.00/oz vs $39.09/oz — Act+Acre Stem Cell Scalp Serum costs about 1.3× more per ounce than Bondi Boost Lock Drops Anti-Shedding Scalp & Hair Serum.

$1.25/oz median $7.19/oz $55.03/oz $39.09/oz Stem Cell Scalp Serum $30.00/oz Lock Drops Anti-Shedding S

Every mark sits on one distribution because these are compared against the same set: 154 scalp treatments with a computable unit price.

Value readStem Cell Scalp SerumLock Drops Anti-Shedding Scalp & Hair Serum
Label
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.

Computed from cost per ounce against every product of this type we have priced, and from how many products that do the same job cost less. It is a comparison, not a judgement about the brand.

Compare with something else

Close formulas to each of these, as their own comparison pages.

Stem Cell Scalp Serum vs Hair Density Serum IntenseGrow Gorgeous · 99% function matchLock Drops Anti-Shedding Scalp & Hair Serum vs Hair Restore Advanced Growth Support SerumNeutrogena · 100% function matchStem Cell Scalp Serum vs Youth Juice Collagen Scalp SerumColor Wow · 96% function matchLock Drops Anti-Shedding Scalp & Hair Serum vs Turmeric Purifying Hair & Scalp MaskBounce Curl · 99% function matchStem Cell Scalp Serum vs Revive+ Densifying Serum for WomenBosley · 96% function matchLock Drops Anti-Shedding Scalp & Hair Serum vs Scalp Care Scalp Cleansing SerumDesign Essentials · 99% function matchStem Cell Scalp Serum vs Clean Beauty Scalp Therapy DropsPaul Mitchell · 96% function matchLock Drops Anti-Shedding Scalp & Hair Serum vs Clean Beauty Scalp Therapy DropsPaul Mitchell · 99% function match

Stem Cell Scalp Serum · Lock Drops Anti-Shedding Scalp & Hair Serum · All scalp treatments in the library

How this page was made

  • This page is assembled from the same researched records the individual product pages render: identity, each ingredient list as printed, each brand's own claims, dated price observations, and review themes written in our researchers' own words. Nothing on it is written per comparison.
  • We do not rank these against each other. Which of them suits you depends on your hair, and that is what the consultation works out.
  • The formula similarity percentage is a stored, precomputed number: position-weighted overlap of the two ingredient lists blended with agreement on the attributes we derive. It measures how alike two formulas are, not how well either works.
  • 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.
  • 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.
  • 6 sources were consulted across the products on this page.
  • Ingredient order tells you relative amount only above roughly 1%. Prices are observations on the dates shown and change without notice. We do not sell these products and take no placement fees.
  • This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.

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