Ingredient review
CI 51319
INCI: CI 51319
CI 51319 is a widely used synthetic red dye that adds vibrant color to cosmetics, but it offers no skincare benefits and may cause allergic reactions in sensitive individuals.
In plain English
CI 51319 is a man-made red dye used to give cosmetics like lipstick, blush, and eyeshadow their color. It doesn't do anything for your skin—it's purely for appearance. While generally safe in small amounts, some people with very sensitive skin or allergies might experience irritation. Think of it like food coloring for your makeup.
Review score
Safety, usefulness, and evidence
Useful in the right context, but not low-maintenance
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
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Read the cautions before using
CI 51319 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 51319.
- 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 51319 is a synthetic azo dye, specifically Acid Red 14, that belongs to the class of color additives approved for cosmetic use. It is produced through chemical synthesis and provides a bright red hue.
How it works
In a cosmetic product, CI 51319 works by absorbing and reflecting specific wavelengths of light, which makes the product appear red. It is mixed into the formula during manufacturing and stays suspended or dissolved in the base, coloring the entire product evenly.
Pros
Vibrant color payoff
Provides a bright, consistent red shade that stays true in various lighting conditions, making it popular in lipsticks and blushes.
Good stability
Resists fading from light exposure and pH changes, so your makeup color stays looking fresh longer.
Cons and cautions
No skincare benefit
This ingredient is purely cosmetic—it adds color but does not moisturize, protect, or improve your skin in any way.
Allergy risk
A small percentage of people may develop contact dermatitis or irritation, especially if they have a history of reactions to synthetic dyes.
Best for
- Anyone who wants colorful makeup and has no known sensitivity to synthetic dyes
- People looking for affordable, widely available color options
Use caution if
- Individuals with known allergies to azo dyes or sensitive skin prone to irritation
- Those seeking natural or organic cosmetics
Usage tips
Safety summary
CI 51319 is considered safe for most people when used in cosmetics at regulated concentrations. The main risk is allergic contact dermatitis in sensitive individuals. Regulatory bodies like the FDA and EU SCCS have set limits to ensure consumer safety.
Research notes
Studies confirm that CI 51319 is a low-irritant colorant for the majority of users, but patch test studies show it can cause allergic reactions in a small subset of the population, particularly those with pre-existing dye allergies.
Common label clues
- Typical concentration
- Typically less than 1% in rinse-off products; up to 6% in leave-on products (varies by regulation)
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU, subject to concentration limits and purity standards. Not approved for use in products applied to mucous membranes in some regions.
- Common uses
- Lipsticks, Blushes, Eye shadows, Nail polishes, Bath products
- Environmental note
- As a synthetic dye, CI 51319 is not biodegradable and may accumulate in water systems. Proper disposal of cosmetics containing it is recommended to minimize environmental impact.
Good to know
- CI 51319 is approved for cosmetic use in many countries, including the US (FDA) and EU, with strict purity and concentration limits.
- It is often listed as 'Acid Red 14' on some ingredient lists.
Common questions
What is CI 51319 in beauty products?
CI 51319 is a man-made red dye used to give cosmetics like lipstick, blush, and eyeshadow their color. It doesn't do anything for your skin—it's purely for appearance. While generally safe in small amounts, some people with very sensitive skin or allergies might experience irritation. Think of it like food coloring for your makeup.
What does CI 51319 do in a beauty product?
In a cosmetic product, CI 51319 works by absorbing and reflecting specific wavelengths of light, which makes the product appear red. It is mixed into the formula during manufacturing and stays suspended or dissolved in the base, coloring the entire product evenly.
Is CI 51319 safe for most people?
CI 51319 is considered safe for most people when used in cosmetics at regulated concentrations. The main risk is allergic contact dermatitis in sensitive individuals. Regulatory bodies like the FDA and EU SCCS have set limits to ensure consumer safety.
Who should be careful with CI 51319?
Individuals with known allergies to azo dyes or sensitive skin prone to irritation Those seeking natural or organic cosmetics
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.