HUMECTANT
Glycerin
- humectant
Glycerin, also called glycerol, attracts moisture and mixes completely with water.
- products in our library
- 4144
- of researched products
- 61%
- on the label, in our shampoos
- usually #7
- most common in
- Shampoo
- 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.
How strongly the class holds on to water.
The strongest binders are the ones the weather moves most.
| Property | Level | Out of |
|---|---|---|
| Buildup risk | Low | 1 of 5 |
| Rinse-out behaviour | Rinses clean | 5 of 5 |
| Water-binding | Strongest | 5 of 5 |
| Humidity sensitivity | Swings with the air | 5 of 5 |
What it does for a formula
What Glycerin does
The general function first, then how the role changes by product type where we have researched it.
Binds water and holds it against the hair rather than adding oil.
What a humectant does depends on the air around it as much as on the formula.
Water alone removes it, so it does not accumulate between washes.
Hair neither pulls it in nor pushes it away.
Charge
Carries no charge, so it neither clings to hair nor is pushed away by it. Nonionic ingredients are the mild, pH-tolerant workhorses of a formula.
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 ? |
|---|---|---|
Shampoo
987 products
|
supporting · #7 | |
Conditioner
766 products
|
supporting · #5 | |
Leave-in
478 products
|
supporting · #4 | |
Mask / treatment
410 products
|
supporting · #5 | |
Scalp treatment
188 products
|
supporting · #4 | |
Styler: gel
179 products
In styling gel, glycerin helps retain moisture as the product dries, supporting a softer, more flexible finish. The hold itself comes from the formula's film-forming polymers. Cosmetic Ingredient Review
|
leading · #3 | |
Styler: curl cream
170 products
|
supporting · #4 | |
Heat protectant
112 products
|
supporting · #8 | |
Styler: mousse
109 products
|
supporting · #8 | |
Styler: paste
102 products
|
supporting · #8 |
15 more product types
| Product type | How common | Typical position on label ? |
|---|---|---|
Styler: hairspray
87 products
|
secondary · #9 | |
Styler: volumizer
80 products
|
secondary · #10 | |
Co-wash
74 products
|
supporting · #5 | |
Styler: texture spray
59 products
|
supporting · #8 | |
Finisher: serum
55 products
|
supporting · #5 | |
Styler: smoothing cream
55 products
|
supporting · #6 | |
Finisher: oil
45 products
|
secondary · #11 | |
Finisher: shine spray
45 products
|
supporting · #6 | |
Dry shampoo
42 products
|
secondary · #12 | |
Styler: edge control
34 products
|
supporting · #4 | |
Styler: refresh spray
27 products
|
leading · #2 | |
Styler: lotion
22 products
|
supporting · #5 | |
Finisher: anti frizz finish
16 products
|
supporting · #7 | |
Finisher: end oil
1 product
|
secondary · #16 | |
Lightener
1 product
|
secondary · #16 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Shampoo | 987 | 63% | 7 | 1 | supporting |
| Conditioner | 766 | 68% | 5 | 1 | supporting |
| Leave-in | 478 | 69% | 4 | 1 | supporting |
| Mask / treatment | 410 | 70% | 5 | 1 | supporting |
| Scalp treatment | 188 | 65% | 4 | 1 | supporting |
| Styler: gel | 179 | 67% | 3 | 1 | leading |
| Styler: curl cream | 170 | 75% | 4 | 2 | supporting |
| Heat protectant | 112 | 55% | 8 | 2 | supporting |
| Styler: mousse | 109 | 54% | 8 | 2 | supporting |
| Styler: paste | 102 | 52% | 8 | 2 | supporting |
| Styler: hairspray | 87 | 36% | 9 | 2 | secondary |
| Styler: volumizer | 80 | 55% | 10 | 1 | secondary |
| Co-wash | 74 | 74% | 5 | 1 | supporting |
| Styler: texture spray | 59 | 60% | 8 | 2 | supporting |
| Finisher: serum | 55 | 40% | 5 | 2 | supporting |
| Styler: smoothing cream | 55 | 68% | 6 | 2 | supporting |
| Finisher: oil | 45 | 16% | 11 | 2 | secondary |
| Finisher: shine spray | 45 | 44% | 6 | 2 | supporting |
| Dry shampoo | 42 | 32% | 12 | 3 | secondary |
| Styler: edge control | 34 | 89% | 4 | 2 | supporting |
| Styler: refresh spray | 27 | 77% | 2 | 2 | leading |
| Styler: lotion | 22 | 61% | 5 | 2 | supporting |
| Finisher: anti frizz finish | 16 | 50% | 7 | 2 | supporting |
| Finisher: end oil | 1 | 13% | 16 | 16 | secondary |
| Lightener | 1 | 33% | 16 | 16 | secondary |
Position footprint
Every listing in our library, by position on the label.
| Positions | Zone | Listings |
|---|---|---|
| 1-3 | Leading | 1081 |
| 4-8 | Supporting | 1602 |
| 9-15 | Secondary | 787 |
| 16-25 | Lower | 502 |
| 26+ | Trace | 172 |
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
Formulation guidance for specific hair conditions, limited to the label positions where it applies. It is not a conclusion about any finished product, or about you.
May suit hair that benefits from added water retention and a softer, more flexible gel finish.
Read where it is listed in the first three ingredients or positions 4–8. Researched in our styling gels.Binds water into the outer layers of the strand, and water is what makes dry hair flexible again rather than brittle.
Consider the climate and the complete formula: prominent humectants can behave differently in very dry air and on frizz-prone hair in high humidity.
Read where it is listed in the first three ingredients or positions 4–8. Researched in our styling gels.Water 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.
Rows marked “researched” were read for this ingredient and cited below; the rest are read from its chemical class.
Why it matters to shoppers
What seeing this ingredient tells you, what it does not, and the limits of our own method.
- hydration that does not add oil
- hydration rather than oil
- a rinse-clean feel
- moisture that stays on coarse or porous hair
- 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 humectant alongside the main ingredients in our shampoos
- it was on the printed ingredient list of every product we counted (we read labels, not marketing copy)
- frizz in every climate (what it does depends on the air)
- 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.
- Ethylhexylglycerin · 1434
- Benzyl Alcohol · 1165
- Cetrimonium Chloride · 1074
- Tocopherol · 1071
- Behentrimonium Chloride · 1039
- Caprylyl Glycol · 1019
- Guar Hydroxypropyltrimonium Chloride · 979
- Cetyl Alcohol · 888
- Hexyl Cinnamal · 868
- Sodium Chloride · 867
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.
Bosley · Scalp treatment
Rejuvenating Scalp Scrub
#1 on the label · $5.49/oz
Briogeo · Shampoo
Don't Despair, Repair! Rich Rice Water Shampoo Concentrate
#1 on the label · $8.40/oz
Camille Rose · Leave-in
Rosemary Oil Strengthening Leave-In Conditioner
#1 on the label · $1.45/oz
Carol's Daughter · Conditioner
Wash Day Delight Conditioner with Aloe
#1 on the label · $0.70/oz
Everyone · Shampoo
Lavender Lullaby Kids 3in1 Soap
#1 on the label · $0.41/oz
Everyone · Shampoo
Tropical Coconut Kids 3in1 Soap
#1 on the label · $0.41/oz
Gibs Grooming · Styler
Styling Texture Powder
#1 on the label · $18.00/oz
Oribe · Mask / treatment
Mirror Rinse Glass Hair Treatment
#1 on the label · $12.20/oz
Qhemet Biologics · Scalp treatment
MSM + ROSEMARY – Scalp Nutrients Balm
#1 on the label · $7.25/oz
SHAZ & KIKS · Shampoo
Balancing Clay Hair Cleanser
#1 on the label · $5.40/oz
SHAZ & KIKS · Shampoo
Ultra Hydrating Turmeric Shampoo
#1 on the label · $5.40/oz
SheaMoisture · Styler
Coconut & Hibiscus Curling Gel Souffle
#1 on the label · $1.00/oz
Identity
What this entry is, and what our references call it.
Glycerin
- CAS 56-81-5
- PubChem 753
- glycerin
- glycerin (vegetable)
- glycerin (vegetable/végétale)
- glycerin vegetable
- glycerin^
- glycerine
- glycerine (vegetable)
- glycerol
- natural glycerin
- organic glycerin
- organic vegetable glycerin
- vegetable glycerin
- vegetable glycerin (plant-based softener)
- vegetable glycerine
For your hair?
Whether Glycerin matters for your hair depends on your hair.
the 1st most-listed humectant 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 Scientific Reports : Chen et al., Moisture retention of glycerin solutions with various concentrations (2022). Measures glycerin solutions losing water below about 60 wt%, holding steady at 60–70 wt%, and taking water up from the air above 70 wt% — the direction of water movement depends on the concentration and on the surrounding air, not on the ingredient alone. · accessed 2026-08-30
- Manufacturer or regulatory PubChem : Compound identity: CID 753, CAS 56-81-5, C3H8O3 · accessed 2026-08-28
By product type
- Manufacturer or regulatory Cosmetic Ingredient Review : Humectant and hair-conditioning functions of glycerin in cosmetics. · accessed 2026-08-27
How this page was made
- Every number above is counted from the ingredient lists in our own product library: 4144 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.
