Ingredient review
CI 75170
INCI: CI 75170
CI 75170 is a safe, natural pearlescent pigment that adds shimmer to makeup but offers no skincare benefits.
In plain English
CI 75170 is a pigment that gives makeup a shiny, pearl-like finish. It is often made from fish scales or created in a lab, and it is used in products like nail polish, lipstick, and eyeshadow to make them sparkle. It does not treat skin conditions or provide moisture—it is purely for visual effect.
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
CI 75170 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 CI 75170.
- 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
CI 75170 is a natural pigment composed primarily of guanine crystals, which reflect light to create a pearlescent shimmer. It can be sourced from fish scales or produced synthetically.
How it works
In cosmetics, CI 75170 sits on the surface of the skin or nails and reflects light, creating a shiny, iridescent effect. It does not penetrate the skin or interact with biological processes.
Pros
Natural origin
CI 75170 is derived from natural sources (fish scales) and is generally well-tolerated by most skin types.
Subtle shimmer
Unlike chunky glitter, CI 75170 provides a fine, pearl-like glow that looks elegant and natural on the skin.
Cons and cautions
Not vegan-friendly
If sourced from fish scales, CI 75170 is not suitable for vegans. Synthetic versions exist but are less common.
No skincare benefit
CI 75170 is purely a colorant and does not hydrate, protect, or improve skin health in any way.
Best for
- Anyone wanting a subtle shimmer in their makeup
- People who prefer natural-origin pigments
Use caution if
- Vegans or those avoiding animal-derived ingredients
- Individuals with extremely sensitive skin who react to shimmer particles
Usage tips
Safety summary
CI 75170 is considered safe for cosmetic use with low irritation and comedogenic risk. It is not absorbed into the skin and poses minimal health concerns.
Research notes
Studies confirm that CI 75170 (guanine) is non-toxic and non-sensitizing when used topically. It has a long history of safe use in cosmetics.
Common label clues
- Typical concentration
- 0.1% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions, with no known restrictions at typical concentrations.
- Common uses
- Nail polish, Lipstick, Eyeshadow, Shimmer powders
- Environmental note
- Sourcing from fish scales uses a byproduct of the fishing industry, but synthetic alternatives reduce reliance on animal sources.
Good to know
- CI 75170 is also known as guanine and is the same substance that gives fish scales their silvery sheen.
- Synthetic versions of CI 75170 are available and are chemically identical to the natural form.
Common questions
What is CI 75170 in beauty products?
CI 75170 is a pigment that gives makeup a shiny, pearl-like finish. It is often made from fish scales or created in a lab, and it is used in products like nail polish, lipstick, and eyeshadow to make them sparkle. It does not treat skin conditions or provide moisture—it is purely for visual effect.
What does CI 75170 do in a beauty product?
In cosmetics, CI 75170 sits on the surface of the skin or nails and reflects light, creating a shiny, iridescent effect. It does not penetrate the skin or interact with biological processes.
Is CI 75170 safe for most people?
CI 75170 is considered safe for cosmetic use with low irritation and comedogenic risk. It is not absorbed into the skin and poses minimal health concerns.
Who should be careful with CI 75170?
Vegans or those avoiding animal-derived ingredients Individuals with extremely sensitive skin who react to shimmer particles
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.