ACTIVE
Caffeine
- active
Included in scalp and thickening products for label appeal. Evidence for applied caffeine changing hair growth is limited.
- products in our library
- 187
- of researched products
- 3%
- on the label, in our scalp treatments
- usually #8
- most common in
- Scalp treatment
- in water
- Water-soluble
At a glance
Four things worth knowing about how this ingredient behaves on hair.
How much of it is left on hair between washes.
What it takes to get it off the hair again.
Where it sits on the labels we have, in the category it appears in most.
Why a formulator says it is in there.
| Property | Level | Out of |
|---|---|---|
| Buildup risk | Low | 1 of 5 |
| Rinse-out behaviour | Rinses clean | 5 of 5 |
| Prominence | Supporting | 4 of 5 |
| Stated purpose | A stated active | 4 of 5 |
What it does for a formula
What Caffeine does
The general function first, then how the role changes by product type where we have researched it.
Named on the label for a specific purpose rather than for texture.
Water alone removes it, so it does not accumulate between washes.
Charge
Charge is not recorded for this ingredient.
Solubility
Rinses out with water alone, so it does not build up on hair between washes.
Where it appears
Where it appears
One row per product category in our library: how many products list it, what share of that category that is, and where it typically sits on the label.
| Product type | How common | Typical position on label ? |
|---|---|---|
Scalp treatment
54 products
|
supporting · #8 | |
Shampoo
46 products
|
secondary · #15 | |
Conditioner
28 products
|
secondary · #17 | |
Leave-in
10 products
|
secondary · #13 | |
Mask / treatment
8 products
|
secondary · #21 | |
Styler: volumizer
7 products
|
secondary · #14 | |
Finisher: serum
6 products
|
secondary · #13 | |
Heat protectant
6 products
|
secondary · #26 | |
Styler: paste
4 products
|
secondary · #20 | |
Dry shampoo
3 products
|
supporting · #7 |
9 more product types
| Product type | How common | Typical position on label ? |
|---|---|---|
Styler: mousse
3 products
|
secondary · #14 | |
Co-wash
2 products
|
secondary · #23 | |
Styler: edge control
2 products
|
secondary · #16 | |
Styler: gel
2 products
|
secondary · #20 | |
Styler: smoothing cream
2 products
|
secondary · #23 | |
Finisher: anti frizz finish
1 product
|
secondary · #22 | |
Styler: hairspray
1 product
|
secondary · #10 | |
Styler: refresh spray
1 product
|
secondary · #25 | |
Styler: texture spray
1 product
|
supporting · #8 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Scalp treatment | 54 | 19% | 8 | 3 | supporting |
| Shampoo | 46 | 3% | 15 | 4 | secondary |
| Conditioner | 28 | 2% | 17 | 4 | secondary |
| Leave-in | 10 | 1% | 13 | 6 | secondary |
| Mask / treatment | 8 | 1% | 21 | 15 | secondary |
| Styler: volumizer | 7 | 5% | 14 | 7 | secondary |
| Finisher: serum | 6 | 4% | 13 | 5 | secondary |
| Heat protectant | 6 | 3% | 26 | 3 | secondary |
| Styler: paste | 4 | 2% | 20 | 4 | secondary |
| Dry shampoo | 3 | 2% | 7 | 7 | supporting |
| Styler: mousse | 3 | 1% | 14 | 6 | secondary |
| Co-wash | 2 | 2% | 23 | 18 | secondary |
| Styler: edge control | 2 | 5% | 16 | 13 | secondary |
| Styler: gel | 2 | 1% | 20 | 17 | secondary |
| Styler: smoothing cream | 2 | 2% | 23 | 18 | secondary |
| Finisher: anti frizz finish | 1 | 3% | 22 | 22 | secondary |
| Styler: hairspray | 1 | 0% | 10 | 10 | secondary |
| Styler: refresh spray | 1 | 3% | 25 | 25 | secondary |
| Styler: texture spray | 1 | 1% | 8 | 8 | supporting |
We have not researched differences by product type yet. The reading below comes from where it sits on the labels in our library.
Position footprint
Every listing in our library, by position on the label.
| Positions | Zone | Listings |
|---|---|---|
| 1-3 | Leading | 6 |
| 4-8 | Supporting | 48 |
| 9-15 | Secondary | 49 |
| 16-25 | Lower | 54 |
| 26+ | Trace | 30 |
How to read this
US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order.
So position tells you about relative amount only above that line, and we never convert a position into a percentage.
Why it matters to shoppers
What seeing this ingredient tells you, what it does not, and the limits of our own method.
- an ingredient included for a stated purpose
- a rinse-clean feel
- an exact safety score (we do not publish one for any ingredient)
- how a finished product performs, which depends on the whole formula, not one line of it
- the exact percentage in a bottle, because label position never converts into a number
- a supporting active alongside the main ingredients in our scalp treatments
- it was on the printed ingredient list of every product we counted (we read labels, not marketing copy)
- that a product is right or wrong for you
We do not publish safety scores or hazard grades. Where a regulator has published a restriction or a use condition, we state it and cite it; otherwise we describe what the ingredient does and stop.
Commonly paired with
The ingredients that most often appear alongside this one in our library. We leave out the near-universal ones, because they pair with everything and tell you nothing.
- Biotin · 99
- Niacinamide · 74
- Ethylhexylglycerin · 74
- Propanediol · 64
- Butylene Glycol · 50
- Caprylyl Glycol · 50
- Tocopherol · 50
- Sodium Hydroxide · 45
- Benzyl Alcohol · 45
- Camellia Sinensis (Green Tea) Leaf Extract · 43
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to deliver a stated effect, improve feel after rinsing, and soften the strand.
Found in these products
The most prominent placements first. The badge is the position on that product’s own ingredient list.
Christophe Robin · Scalp treatment
Fortifying Scalp Serum with Amaranth Peptides
#3 on the label · $35.29/oz
Grow Gorgeous · Scalp treatment
Hair Density Serum Intense
#3 on the label · $25.00/oz
Marc Anthony · Heat protectant
Grow Long Anti-Frizz Shield Ultimate Blowout Spray
#3 on the label · $1.57/oz
Nioxin · Scalp treatment
Pro Clinical Night Density Rescue Serum
#3 on the label · $21.74/oz
Nioxin · Scalp treatment
Pro Clinical System 1 Scalp Care + Hair Thickening Treatment
#3 on the label · $8.09/oz
Nioxin · Scalp treatment
Pro Clinical System 3 Scalp Care + Hair Thickening Treatment
#3 on the label · $6.42/oz
Cantu · Styler
Mens Cream Pomade
#4 on the label · $0.62/oz
Davines · Scalp treatment
ENERGIZING Gel
#4 on the label · $7.89/oz
Nature Skin Shop · Conditioner
Caffeine Energizing Conditioner for Thinning Hair
#4 on the label · $5.82/oz
Nature Skin Shop · Shampoo
Caffeine Shampoo Bar with Tea Tree Oil – Growth & Scalp Care
#4 on the label · $10.00/oz
Nioxin · Scalp treatment
Pro Clinical Hair Fall Defense Serum
#4 on the label · $21.74/oz
Nioxin · Scalp treatment
Pro Clinical System 2 Scalp Care + Hair Thickening Treatment
#4 on the label · $6.42/oz
Identity
What this entry is, and what our references call it.
Caffeine
- CAS 58-08-2
- PubChem 2519
- caffeine
For your hair?
Whether Caffeine matters for your hair depends on your hair.
the 6th most-listed vitamin or active in our libraryWhat this ingredient does, and where it sits on the labels we have researched.
A verdict on any product that contains it, and never a safety grade.
We do not physically test your hair. Everything above comes from the ingredient lists in our library and from published references. The consultation is what turns it into a plan.
References
Sourced Backed by a manufacturer or regulatory source.
This ingredient
- Manufacturer or regulatory PubChem : Compound identity: CID 2519, CAS 58-08-2, C8H10N4O2 · accessed 2026-08-28
How this page was made
- Every number above is counted from the ingredient lists in our own product library: 187 of 6816 researched products list this ingredient. Nothing on this page is written per ingredient.
- The dots are levels, not scores. Each one comes from what kind of ingredient it is (its chemical class, charge and solubility) or from where it sits on the labels we have.
- US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order. Position tells you about relative amount only above that line, and we never convert a position into a percentage.
- The prominence bands (leading, supporting, secondary) are the same ones the product pages use to read a single label, applied here to the median position across a category.
- We do not publish safety scores or hazard grades. Where a regulator has published a restriction or a use condition, we state it and cite it; otherwise we describe what the ingredient does and stop.
- Identifiers and references appear only when a published source is attached to this entry. Without one, we leave the row out rather than fill it in.
- This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.
- Entry last updated 2026-09-22. Product-page methodology: the product library.
