HUMECTANT
Sodium Lactate
- humectant
A salt of lactic acid used to hold moisture and steady the pH.
- products in our library
- 177
- of researched products
- 3%
- on the label, in our shampoos
- usually #24
- 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 Sodium Lactate 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.
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, 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
44 products
|
secondary · #24 | |
Mask / treatment
33 products
|
secondary · #31 | |
Conditioner
25 products
|
secondary · #33 | |
Leave-in
25 products
|
secondary · #25 | |
Heat protectant
11 products
|
secondary · #23 | |
Scalp treatment
10 products
|
secondary · #24 | |
Co-wash
7 products
|
secondary · #44 | |
Styler: curl cream
4 products
|
secondary · #27 | |
Finisher: serum
3 products
|
secondary · #23 | |
Styler: mousse
3 products
|
secondary · #23 |
7 more product types
| Product type | How common | Typical position on label ? |
|---|---|---|
Styler: smoothing cream
3 products
|
secondary · #24 | |
Styler: volumizer
3 products
|
secondary · #27 | |
Styler: lotion
2 products
|
secondary · #38 | |
Dry shampoo
1 product
|
supporting · #6 | |
Styler: hairspray
1 product
|
secondary · #19 | |
Styler: refresh spray
1 product
|
secondary · #40 | |
Styler: texture spray
1 product
|
secondary · #9 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Shampoo | 44 | 3% | 24 | 5 | secondary |
| Mask / treatment | 33 | 6% | 31 | 14 | secondary |
| Conditioner | 25 | 2% | 33 | 10 | secondary |
| Leave-in | 25 | 4% | 25 | 15 | secondary |
| Heat protectant | 11 | 5% | 23 | 10 | secondary |
| Scalp treatment | 10 | 3% | 24 | 6 | secondary |
| Co-wash | 7 | 7% | 44 | 27 | secondary |
| Styler: curl cream | 4 | 2% | 27 | 25 | secondary |
| Finisher: serum | 3 | 2% | 23 | 19 | secondary |
| Styler: mousse | 3 | 1% | 23 | 11 | secondary |
| Styler: smoothing cream | 3 | 4% | 24 | 13 | secondary |
| Styler: volumizer | 3 | 2% | 27 | 19 | secondary |
| Styler: lotion | 2 | 6% | 38 | 27 | secondary |
| Dry shampoo | 1 | 1% | 6 | 6 | supporting |
| Styler: hairspray | 1 | 0% | 19 | 19 | secondary |
| Styler: refresh spray | 1 | 3% | 40 | 40 | secondary |
| Styler: texture spray | 1 | 1% | 9 | 9 | 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 | 8 |
| 9-15 | Secondary | 11 |
| 16-25 | Lower | 56 |
| 26+ | Trace | 102 |
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.
High-porosity hair loses water fast; a humectant holds some of it in place for longer than the wash itself would.
Binds water into the outer layers of the strand, and water is what makes dry hair flexible again rather than brittle.
A humectant moves water in whichever direction the air allows: it holds moisture in humid conditions and can pull it back out of hair in very dry ones.
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.
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 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 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, 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 humectant, listed below 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.
- Sodium PCA · 144
- Glycine · 139
- Arginine · 132
- Alanine · 130
- Serine · 130
- Proline · 129
- Threonine · 129
- Valine · 126
- Aspartic Acid · 126
- Isoleucine · 125
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to hold on to water and firm up damaged areas.
Found in these products
The most prominent placements first. The badge is the position on that product’s own ingredient list.
Nature Skin Shop · Shampoo
Amla Ayurvedic Shampoo Bar for Hair Growth & Strength
#5 on the label · $10.00/oz
Nature Skin Shop · Shampoo
Apple Cider Vinegar Clarifying Sansa Shampoo Bar
#5 on the label · $10.00/oz
Nature Skin Shop · Shampoo
Clara 2-in-1 Moisturizing Shampoo & Conditioner Bar
#5 on the label · $10.00/oz
Nature Skin Shop · Shampoo
Luna Collagen & Biotin Shampoo
#5 on the label · $10.00/oz
Nature Skin Shop · Shampoo
Zoe Keratin Smoothing Shampoo Bar
#5 on the label · $10.00/oz
Act+Acre · Scalp treatment
Daily Hydro Scalp Serum with Hyaluronic Acid
#6 on the label · $24.00/oz
L'Oreal Paris · Dry shampoo
Elvive Collagen Peptide + Lifter Big Fresh Volumizing Dry Shampoo
#6 on the label
Divi · Scalp treatment
Scalp Serum
#8 on the label · $47.53/oz
18.21 Man Made · Styler
Sea Salt Spray - Sweet Tobacco
#9 on the label · $7.06/oz
Suave · Shampoo
Bonding Infusion Purple Shampoo
#9 on the label · $0.18/oz
PATTERN · Heat protectant
Blow Out Primer
#10 on the label · $6.75/oz
UNITE Hair · Conditioner
BLONDA Daily Purple Conditioner
#10 on the label · $5.06/oz
See all 177 products in the library that list Sodium Lactate
Identity
What this entry is, and what our references call it.
No public-domain structure depiction is available for this entry.
Sodium Lactate
- pH adjuster
- sodium lactate
For your hair?
Whether Sodium Lactate matters for your hair depends on your hair.
the 10th 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
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: 177 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.
