Sunscreen Ingredients to Avoid and Why

Not all sunscreen ingredients are safe. Here’s what to avoid and why.

Ingredients to Avoid

Oxybenzone

One of the most controversial chemical sunscreen ingredients. Concerns include:

• Hormone disruption (estrogenic effects)
• Allergic reactions (top 5 allergen)
• Coral reef damage
• Potential carcinogenic effects
• High skin absorption (up to 10%)

Octinoxate (Octyl methoxycinnamate)

Endocrine disruptor, coral reef damage, may cause reproductive issues, photodegradation produces unknown compounds.

Homosalate

Endocrine disruptor, accumulates in body, may affect thyroid function, banned in some countries for children.

Octocrylene

Photodegradation produces free radicals, potential carcinogen, accumulates in body, environmental concerns.

Retinyl Palmitate (Vitamin A)

When exposed to UV, breaks down into free radicals, may increase cancer risk, FDA has flagged as a concern.

Methylisothiazolinone (MI)

Preservative, top contact allergen, banned in leave-on products in EU, can cause severe skin reactions.

Ingredients That Are Safe

Mineral (Zinc Oxide & Titanium Dioxide)

Mineral active ingredients have been used safely for over 30 years. They:

• Don’t absorb into bloodstream
• Don’t disrupt hormones
• Are reef-safe
• Are photostable (don’t break down)
• Are recommended by dermatologists

Newer Chemical Filters (Some Safer Options)

Mexoryl SX and Mexoryl XL (stable, less absorbed), Tinosorb S and Tinosorb M (broad spectrum, stable, low absorption), Uvinul A Plus (stable, photoprotective).

How to Read Sunscreen Labels

Check the active ingredients list. Avoid products with oxybenzone, octinoxate, homosalate, octocrylene. Look for mineral SPF (zinc oxide, titanium dioxide). Check the inactive ingredients for fragrance and preservatives.

Mineral vs Chemical: The Bottom Line

Mineral SPF is the safer, more sustainable choice. Chemical SPF has more concerns about absorption, hormone disruption, and environmental impact. Choose mineral whenever possible, especially for children, pregnancy, and sensitive skin.