Ingredient review
Chalk
INCI: CI 77220
Chalk is a safe, natural mineral that helps absorb oil and add opacity in makeup, but it can be drying for some skin types.
In plain English
Chalk is a soft, white mineral (calcium carbonate) that is ground into a fine powder. In skincare and makeup, it is used to absorb excess oil, give products a matte finish, and add white color or opacity. It is generally very safe and non-irritating, but because it absorbs moisture, it may feel drying on already dry or sensitive skin.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- natural
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Chalk is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Chalk.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Chalk is a naturally occurring form of calcium carbonate, mined from sedimentary rock. In cosmetics, it is purified and micronized into a fine powder.
How it works
Chalk works by physically absorbing sebum and moisture from the skin's surface, creating a matte, non-shiny appearance. It also scatters light, which helps products appear opaque or white.
Pros
Excellent oil absorption
Chalk effectively soaks up excess sebum, helping to keep skin matte and shine-free throughout the day.
Very low irritation risk
As a natural mineral, chalk rarely causes allergic reactions or irritation, making it suitable for most skin types.
Cons and cautions
Can be drying
Because chalk absorbs moisture, it can leave dry or dehydrated skin feeling tight, flaky, or uncomfortable.
May look chalky
If applied too heavily, chalk can leave a visible white or powdery residue, especially on deeper skin tones.
Best for
- People with oily or combination skin looking for oil control
- Anyone using matte finish powders or mineral makeup
Use caution if
- People with very dry or dehydrated skin
- Those with active eczema or extremely sensitive skin
Usage tips
Safety summary
Chalk is considered safe for cosmetic use with very low irritation and allergy potential. It is not absorbed through the skin and poses no known health risks when used as intended.
Research notes
Research on chalk in cosmetics is limited, but calcium carbonate is well-studied as a safe, inert material. Its primary functions are physical absorption and opacity, with no evidence of systemic toxicity.
Common label clues
- Typical concentration
- 1-10% in powders and color cosmetics
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database as a colorant and bulking agent.
- Common uses
- Face powders, Eye shadows, Lipsticks, Toothpastes
- Environmental note
- Chalk is mined from natural deposits, which can have environmental impacts, but it is non-toxic and biodegradable.
Good to know
- Chalk is often listed as CI 77220 on ingredient labels.
- It is also used in some natural toothpastes as a mild abrasive.
- Chalk is biodegradable and generally considered environmentally friendly.
Common questions
What is Chalk in beauty products?
Chalk is a soft, white mineral (calcium carbonate) that is ground into a fine powder. In skincare and makeup, it is used to absorb excess oil, give products a matte finish, and add white color or opacity. It is generally very safe and non-irritating, but because it absorbs moisture, it may feel drying on already dry or sensitive skin.
What does Chalk do in a beauty product?
Chalk works by physically absorbing sebum and moisture from the skin's surface, creating a matte, non-shiny appearance. It also scatters light, which helps products appear opaque or white.
Is Chalk safe for most people?
Chalk is considered safe for cosmetic use with very low irritation and allergy potential. It is not absorbed through the skin and poses no known health risks when used as intended.
Who should be careful with Chalk?
People with very dry or dehydrated skin Those with active eczema or extremely sensitive skin
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.