Ingredient review

Red 4

INCI: CI 14815

CI 14815 is a synthetic red dye that adds vibrant color to cosmetics, but it offers no skincare benefits and may cause allergic reactions in sensitive individuals.

beautyskincarecolorant

In plain English

CI 14815, also known as Red 4, is a man-made dye that gives cosmetics a bright red or pink color. It's used in products like lipstick, blush, and eyeshadow to make them look more appealing. While it's generally considered safe for most people, it doesn't do anything for your skin besides adding color. If you have very sensitive skin or allergies to certain dyes, you might want to avoid it.

Review score

Safety, usefulness, and evidence

3.5Good
3.5/ 5

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
synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Red 4 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Red 4.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

CI 14815 is a synthetic azo dye, meaning it's a colorant created in a lab from petroleum-based ingredients. It's approved for use in cosmetics in many countries, including the US and EU, but with restrictions on concentration and product type.

How it works

In a cosmetic product, CI 14815 simply imparts color. It is mixed into the formula to achieve the desired shade. It does not interact with the skin or provide any functional benefit beyond aesthetics.

Pros

Vibrant color

Provides a bright, consistent red or pink shade that is stable in various cosmetic formulations.

Widely approved

Approved for use in cosmetics by major regulatory bodies like the FDA and EU, with established safety limits.

Cons and cautions

No skin benefit

CI 14815 is purely a colorant and offers no moisturizing, anti-aging, or other skincare benefits.

Potential allergen

Can cause allergic reactions or irritation in people with sensitive skin or dye allergies, especially in leave-on products.

Best for

  • Anyone looking for a bold red or pink color in their makeup
  • People without known dye allergies

Use caution if

  • Individuals with known allergies or sensitivities to synthetic dyes
  • Those seeking only natural or organic cosmetics

Usage tips

Check ingredient labels if you have a known sensitivity to synthetic dyes.
Patch test a new product containing CI 14815 on a small area of skin before full use.
For a natural alternative, look for products colored with iron oxides or carmine.

Safety summary

CI 14815 is generally considered safe for use in cosmetics at regulated concentrations. However, it can cause allergic reactions in sensitive individuals and offers no skincare benefits.

Research notes

Research indicates that CI 14815 has low acute toxicity and is not a significant skin irritant for most people. However, some studies have reported allergic contact dermatitis in susceptible individuals.

Common label clues

Typical concentration
Very low, typically less than 1%
Regulatory status
Approved for use in cosmetics in the US (FDA) and EU, with restrictions on concentration and product type. Not permitted for use in eye-area products in some regions.
Common uses
Lipsticks, Blushes, Eye shadows, Nail polishes, Soaps, Bath products
Environmental note
As a synthetic dye, CI 14815 is derived from petroleum and may not be biodegradable. Its production and disposal can have environmental impacts.

Good to know

  • CI 14815 is also known as D&C Red No. 4 in the US.
  • It is not permitted for use in eye-area products in some regions due to safety concerns.
  • The 'CI' stands for Colour Index, a standard naming system for dyes.

Common questions

What is Red 4 in beauty products?

CI 14815, also known as Red 4, is a man-made dye that gives cosmetics a bright red or pink color. It's used in products like lipstick, blush, and eyeshadow to make them look more appealing. While it's generally considered safe for most people, it doesn't do anything for your skin besides adding color. If you have very sensitive skin or allergies to certain dyes, you might want to avoid it.

What does Red 4 do in a beauty product?

In a cosmetic product, CI 14815 simply imparts color. It is mixed into the formula to achieve the desired shade. It does not interact with the skin or provide any functional benefit beyond aesthetics.

Is Red 4 safe for most people?

CI 14815 is generally considered safe for use in cosmetics at regulated concentrations. However, it can cause allergic reactions in sensitive individuals and offers no skincare benefits.

Who should be careful with Red 4?

Individuals with known allergies or sensitivities to synthetic dyes Those seeking only natural or organic cosmetics

Research sources

FDA Color Additive Status ListOpenCosIng (EU) Database - CI 14815OpenPubMed - Allergic contact dermatitis from D&C Red No. 4Open

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.