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Home/Daily Ingredient
Day 42 of 50 / Toxic ingredient spotlight

Titanium Dioxide (Nanoparticle Form).

Thursday, May 21, 2026

Also known as: nano titanium dioxide, nano TiO2, CI 77891 (nano), ultrafine titanium dioxide

Hazard score

The read.

1 = low concern, 10 = avoid

Hazard Score
5
Moderate Concern
Quick facts

At a glance.

5/10

Hazard Score

0

Products Found

Allowed

Regulatory Status

4

Known Aliases

Commonly found in

Why it matters

Why you should care.

Titanium dioxide in nanoparticle form (<100nm) used in sunscreens to eliminate the white cast of traditional mineral sunscreens. While non-nano titanium dioxide is considered safe, the nanoparticle form raises concerns about cellular penetration, inhalation risks, and potential DNA damage.

Top Health Concern

Nanoparticles can generate reactive oxygen species (free radicals) when exposed to UV light, potentially causing DNA damage.

Source: Toxicology Letters, 2009 — nano-TiO2 genotoxicity in human cell lines

+2 more health risks documented. Read full analysis

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The Numbrrrz alternative.

Numbrrrz products contain no nano titanium dioxide or nanoparticle ingredients. Our lip balms use only Organic Coconut Oil, Organic Jojoba Oil, Organic Beeswax, and Vitamin E — no UV filters of any kind.

non-nano zinc oxidenon-nano titanium dioxideiron oxides (supplementary UV protection)
Numbrrrz organic lip balm — four ingredients, nothing else

Yesterday

Siloxanes (Cyclic Silicones)

Tomorrow

Benzophenone

Day 42 of 50

The archive

All 50 ingredients.

A new ingredient is featured every day. Explore the full database below.

7

Petroleum / Petrolatum

6

Mineral Oil

5

Paraffin Wax

8

Parabens

9

Formaldehyde Releasers

4

Phenoxyethanol

8

Methylisothiazolinone

7

BHA (Butylated Hydroxyanisole)

5

BHT (Butylated Hydroxytoluene)

7

Camphor

6

Menthol

7

Phenol

6

Salicylic Acid

9

Phthalates

8

Triclosan

8

Oxybenzone

7

Octinoxate

6

Homosalate

5

Avobenzone

7

Synthetic Fragrance

6

Artificial Colors

4

Dimethicone

5

Propylene Glycol

6

Polyethylene Glycol (PEG Compounds)

7

DEA, MEA & TEA (Ethanolamines)

6

Sodium Lauryl Sulfate (SLS)

5

Sodium Laureth Sulfate (SLES)

7

Synthetic Dyes (FD&C in Lip Products)

5

Octisalate

10

Lead

9

Coal Tar

5

Bismuth Oxychloride

7

Talc

8

Carbon Black

4

Lanolin

3

Palm Oil

6

Retinyl Palmitate

9

Hydroquinone

8

Toluene

5

Aluminum Compounds

7

Siloxanes (Cyclic Silicones)

Today

5

Titanium Dioxide (Nanoparticle Form)

8

Benzophenone

8

Methylchloroisothiazolinone (MCI)

9

Quaternium-15

7

Imidazolidinyl Urea

4

EDTA (Ethylenediaminetetraacetic Acid)

6

Triethanolamine (TEA)

5

Ceteareth-20

3

Polybutene

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