Common Chemical Fragrances in Shampoos and Their Characteristics

Common Chemical Fragrances in Shampoos and Their Characteristics

Shampoos often contain synthetic fragrances to mask raw ingredient odors or provide pleasant scents. Here are some typical fragrance ingredients and their characteristics:

1. Synthetic Fragrance (Fragrance/Parfum)

• Characteristics:

  • Usually a mixture of multiple compounds (potentially dozens of chemicals), with no requirement to list individual components.

  • May cause allergies or scalp irritation (especially in sensitive individuals).

  • Long-lasting scent, low cost, and widely used in commercial shampoos.

2. Isolated Fragrance Compounds (Common Volatile Ingredients)

• Linalool:

  • Naturally found in lavender and bergamot, but often synthetically produced for shampoos.

  • Floral and citrus notes; may oxidize and cause allergies.

• Limonene:

  • Naturally present in citrus peels; artificially synthesized for fresh, fruity scents.

  • Highly volatile; may irritate skin or trigger contact dermatitis.

• Citronellol:

  • Commonly derived from roses and citronella oil; synthetic versions used for floral fragrances.

  • May cause redness or itching in some individuals.

3. Phthalates

• Characteristics:

  • Used as solvents or fixatives (e.g., DEP, DBP) to prolong fragrance retention.

  • Potential endocrine disruptors; restricted in some countries.

  • Often hidden under "Fragrance" without separate labeling.

Potential Issues with Synthetic Fragrances

• Irritation: May cause scalp sensitivity, itching, or eczema.

• Allergenicity: The EU requires 26 fragrance allergens to be listed separately (e.g., "contains limonene").

• Environmental Impact: Some synthetic fragrances are non-biodegradable and may harm aquatic life.

Alternative Options

• Essential Oils: Such as tea tree oil or peppermint oil (though allergy risks still exist).

• Fragrance-Free: Suitable for sensitive scalps, but may contain other masking agents.