ANTIOXIDANT
Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate
- antioxidant
An antioxidant that protects oils and fragrance from going off. Used at trace levels.
- products in our library
- 213
- of researched products
- 3%
- on the label, in our conditioners
- usually #33
- most common in
- Conditioner
- in water
- Oil-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.
What it is in the formula to protect.
Where it sits on the labels we have, in the category it appears in most.
| Property | Level | Out of |
|---|---|---|
| Buildup risk | Needs a cleanser | 4 of 5 |
| Rinse-out behaviour | Rinses with a cleanser | 2 of 5 |
| Role | Protects oils | 2 of 5 |
| Prominence | Secondary | 2 of 5 |
What it does for a formula
What Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate does
The general function first, then how the role changes by product type where we have researched it.
Protects the oils in the bottle rather than the hair.
It takes a surfactant to remove, which matters on a low-detergent routine.
Charge
Charge is not recorded for this ingredient.
Solubility
Needs a surfactant to remove. On a low-detergent routine it can build up over time.
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 ? |
|---|---|---|
Conditioner
51 products
|
secondary · #33 | |
Shampoo
38 products
|
secondary · #46 | |
Mask / treatment
23 products
|
secondary · #27 | |
Leave-in
20 products
|
secondary · #30 | |
Heat protectant
14 products
|
secondary · #38 | |
Styler: curl cream
10 products
|
secondary · #21 | |
Finisher: oil
7 products
|
secondary · #20 | |
Scalp treatment
7 products
|
secondary · #32 | |
Styler: hairspray
7 products
|
secondary · #14 | |
Finisher: shine spray
5 products
|
secondary · #17 |
12 more product types
| Product type | How common | Typical position on label ? |
|---|---|---|
Styler: paste
5 products
|
secondary · #21 | |
Styler: volumizer
5 products
|
secondary · #31 | |
Finisher: serum
4 products
|
secondary · #24 | |
Styler: gel
4 products
|
secondary · #38 | |
Co-wash
3 products
|
secondary · #16 | |
Finisher: anti frizz finish
2 products
|
secondary · #42 | |
Styler: lotion
2 products
|
secondary · #37 | |
Styler: smoothing cream
2 products
|
secondary · #33 | |
Finisher: end oil
1 product
|
secondary · #30 | |
Styler: edge control
1 product
|
secondary · #22 | |
Styler: mousse
1 product
|
secondary · #31 | |
Styler: refresh spray
1 product
|
secondary · #26 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Conditioner | 51 | 5% | 33 | 8 | secondary |
| Shampoo | 38 | 2% | 46 | 23 | secondary |
| Mask / treatment | 23 | 4% | 27 | 10 | secondary |
| Leave-in | 20 | 3% | 30 | 10 | secondary |
| Heat protectant | 14 | 7% | 38 | 17 | secondary |
| Styler: curl cream | 10 | 4% | 21 | 17 | secondary |
| Finisher: oil | 7 | 3% | 20 | 9 | secondary |
| Scalp treatment | 7 | 2% | 32 | 5 | secondary |
| Styler: hairspray | 7 | 3% | 14 | 7 | secondary |
| Finisher: shine spray | 5 | 5% | 17 | 10 | secondary |
| Styler: paste | 5 | 3% | 21 | 7 | secondary |
| Styler: volumizer | 5 | 3% | 31 | 9 | secondary |
| Finisher: serum | 4 | 3% | 24 | 9 | secondary |
| Styler: gel | 4 | 1% | 38 | 36 | secondary |
| Co-wash | 3 | 3% | 16 | 14 | secondary |
| Finisher: anti frizz finish | 2 | 6% | 42 | 27 | secondary |
| Styler: lotion | 2 | 6% | 37 | 34 | secondary |
| Styler: smoothing cream | 2 | 2% | 33 | 20 | secondary |
| Finisher: end oil | 1 | 13% | 30 | 30 | secondary |
| Styler: edge control | 1 | 3% | 22 | 22 | secondary |
| Styler: mousse | 1 | 0% | 31 | 31 | secondary |
| Styler: refresh spray | 1 | 3% | 26 | 26 | secondary |
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 | 0 |
| 4-8 | Supporting | 4 |
| 9-15 | Secondary | 25 |
| 16-25 | Lower | 48 |
| 26+ | Trace | 136 |
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.
- oils that do not turn rancid in the bottle
- something that lasts through the day
- 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 secondary antioxidant, listed below the main ingredients in our conditioners
- 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.
- Tocopherol · 134
- Propanediol · 121
- Ethylhexylglycerin · 110
- Quaternium-95 · 99
- Caprylyl Glycol · 94
- Benzyl Alcohol · 91
- Behentrimonium Chloride · 84
- Hexyl Cinnamal · 82
- Guar Hydroxypropyltrimonium Chloride · 77
- Butylene Glycol · 75
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, carry the formula and let it dry, 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.
LUSETA · Scalp treatment
Rosemary Mint Complex Hair & Scalp Serum
#5 on the label · $6.73/oz
Bumble and bumble · Styler
Strong Finish Firm Hold Hairspray
#7 on the label · $3.35/oz
SoCozy · Styler
Hair Styling Wax Stick
#7 on the label · $6.00/oz
L'Oreal Professionnel · Conditioner
[Blondifier] Gloss Conditioner
#8 on the label · $2.60/oz
CHI · Finisher
Naturals With Aloe Vera Serum
#9 on the label · $8.00/oz
Maria Nila · Styler
Volume Spray
#9 on the label · $3.96/oz
MONDAY Haircare · Finisher
Repair Hair Oil with Moroccan Argan Oil & Squalane
#9 on the label · $2.33/oz
Paul Mitchell · Finisher
Awapuhi Wild Ginger Styling Treatment Oil
#9 on the label · $12.35/oz
Hask · Leave-in
Keratin Protein 5-in-1 Leave in Spray
#10 on the label · $1.17/oz
Maria Nila · Finisher
Finishing Spray
#10 on the label · $3.44/oz
Maria Nila · Mask / treatment
True Soft Booster Masque
#10 on the label · $6.15/oz
Maria Nila · Styler
Extreme Spray
#11 on the label · $2.92/oz
See all 213 products in the library that list Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate
Identity
What this entry is, and what our references call it.
No public-domain structure depiction is available for this entry.
Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate
- pentaerythrityl tetra-di-t-butyl hydroxyhydro-cinnamate
- pentaerythrityl tetra-di-t-butyl hydroxyhydrocinnamate
For your hair?
Whether Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate matters for your hair depends on your hair.
213 products in our library list itWhat 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
Seed entry, sourcing in progress Written from our reference work; primary sourcing is still being attached.
No published source is attached to this entry yet.
How this page was made
- Every number above is counted from the ingredient lists in our own product library: 213 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.
