AMINO ACID
Glutamic Acid
- amino acid
An amino acid used for moisture binding and to bring the formula to an acidic pH.
- products in our library
- 101
- of researched products
- 3%
- on the label, in our conditioners
- usually #7
- most common in
- Conditioner
- in water
- Water-soluble
At a glance
Four named levels, read from this ingredient’s chemical class, its charge, its solubility, or where it sits on the labels we have. More dots means more of the property named — never “better”.
How much of it is left on hair between washes.
What it takes to get it off the hair again.
Smaller fragments travel further into the strand.
Read from where it sits on the labels we have, not from the molecule.
| Property | Level | Out of |
|---|---|---|
| Buildup risk | Low | 1 of 5 |
| Rinse-out behaviour | Rinses clean | 5 of 5 |
| Fragment size | Smallest | 1 of 5 |
| Stiffening potential | Moderate | 3 of 5 |
What it does for a formula
What Glutamic Acid does
The general function first, then how the role changes by product type where we have researched it.
Small enough to travel further into the strand than a whole protein can.
The cuticle lies flatter on the acidic side; this is how a formula gets there.
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 — it does not accumulate 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 ? |
|---|---|---|
Conditioner
57 products
|
supporting · #7 | |
Mask / treatment
17 products
|
secondary · #15 | |
Shampoo
10 products
|
secondary · #18 | |
Heat protectant
6 products
|
secondary · #16 | |
Leave-in
4 products
|
secondary · #15 | |
Co-wash
3 products
|
secondary · #12 | |
Scalp treatment
1 product
|
secondary · #45 | |
Styler: curl cream
1 product
|
secondary · #35 | |
Styler: mousse
1 product
|
secondary · #15 | |
Styler: smoothing cream
1 product
|
secondary · #53 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Conditioner | 57 | 8% | 7 | 5 | supporting |
| Mask / treatment | 17 | 4% | 15 | 6 | secondary |
| Shampoo | 10 | 1% | 18 | 6 | secondary |
| Heat protectant | 6 | 4% | 16 | 12 | secondary |
| Leave-in | 4 | 1% | 15 | 14 | secondary |
| Co-wash | 3 | 3% | 12 | 11 | secondary |
| Scalp treatment | 1 | 1% | 45 | 45 | secondary |
| Styler: curl cream | 1 | 1% | 35 | 35 | secondary |
| Styler: mousse | 1 | 1% | 15 | 15 | secondary |
| Styler: smoothing cream | 1 | 2% | 53 | 53 | secondary |
No product-type differences have been researched yet — the reading below is computed 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 | 43 |
| 9-15 | Secondary | 34 |
| 16-25 | Lower | 20 |
| 26+ | Trace | 13 |
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.
Who should pay attention
Conditional formulation guidance, scoped to a hair condition and to the positions where it is meaningful. It is not a conclusion about any finished product, and not a conclusion about you.
Amino acids are the smallest protein fraction and bind water as well, so they add far less stiffness than a hydrolysed protein does.
pH adjusters are how a formula is brought to a chosen acidity, and an acidic formula keeps the cuticle lying flatter than an alkaline one. Which way this one moves the pH depends on the formula, and the finished pH is not on the label.
The lightest option in the protein family, but still protein — worth watching if protein reliably stiffens your hair.
Read from this ingredient’s chemical class. Where we have researched the ingredient itself, that reading replaces the class one.
Why it matters to shoppers
What this ingredient is evidence of, what it is not evidence of, and what our own method can and cannot tell you.
- the lightest protein option
- a light protein
- a formula set to the acidity the cuticle prefers
- a rinse-clean feel
- an exact safety score — we do not publish one, for any ingredient
- how a finished product performs by itself — that is the whole formula, not one line of it
- the exact percentage in a bottle — label position never converts into a number
- a supporting amino acid alongside the main ingredients in our conditioners
- it was on the label of every product we counted — we read printed ingredient lists, 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
Ingredients that appear alongside this one most often in our library. Near-universal ingredients are excluded — they pair with everything and tell you nothing.
- Stearyl Alcohol · 65
- Cetyl Alcohol · 63
- Benzyl Alcohol · 61
- Stearamidopropyl Dimethylamine · 57
- Sodium Chloride · 46
- Serine · 39
- Histidine · 38
- Arginine · 36
- Disodium EDTA · 35
- Methylchloroisothiazolinone · 31
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to soften the strand, carry the formula and let it dry, and improve feel after rinsing.
Found in these products
The most prominent placements first. The badge is the position on that product’s own ingredient list.
Aussie · Conditioner
Aussie Paraben-Free Total Miracle Conditioner with Apricot For Damage Hair
#5 on the label · $0.40/oz
Head & Shoulders · Conditioner
Dry Scalp Care Anti-Dandruff Conditioner with Almond Oil
#5 on the label · $0.64/oz
Head & Shoulders · Conditioner
Head & Shoulders Dry Scalp Care Daily-Use Anti-Dandruff Paraben Free Conditioner
#5 on the label · $0.64/oz
Head & Shoulders · Conditioner
Head & Shoulders Smooth & Silky Anti-Dandruff Conditioner
#5 on the label · $0.82/oz
Head & Shoulders · Conditioner
Head Shoulders Coconut Anti-Dandruff Conditioner
#5 on the label · $1.13/oz
Head & Shoulders · Conditioner
Sulfate Free Shea Butter Conditioner
#5 on the label · $0.64/oz
Native · Conditioner
Native Curl Care Conditioner - Coconut Milk & Turmeric
#5 on the label · $3.33/oz
Native · Conditioner
Native Daily Clean Conditioner - Santal & Leather
#5 on the label · $0.67/oz
Native · Conditioner
Native Full & Thick Conditioner - Sandalwood & Coconut
#5 on the label · $0.67/oz
Native · Conditioner
Native Moisturizing Conditioner - Coconut & Vanilla
#5 on the label · $0.61/oz
Native · Conditioner
Volumizing Conditioner
#5 on the label · $0.67/oz
Pantene · Conditioner
Curl Define & Shine Coconut + Shea 1 Minute Miracle Conditioner
#5 on the label · $0.92/oz
Identity
What this entry is, and what our references call it.
Glutamic Acid
- CAS 56-86-0
- PubChem 33032
- pH adjuster
- glutamic acid
For your hair?
Whether Glutamic Acid matters for your hair depends on your hair.
101 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 is read 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 33032, CAS 56-86-0, C5H9NO4 · accessed 2026-08-28
How this page was made
- Every number above is counted from the ingredient lists in our own product library — 101 of 3889 researched products list this ingredient. Nothing on this page is written per ingredient.
- The dots are named levels read from an ingredient’s chemical class, charge, solubility, or where it sits on the labels we have — never a score.
- 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; where none is, the row is simply absent rather than filled in.
- This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.
- Entry last updated 2026-08-28. Product-page methodology: the product library.