Shampoos are surfactant-based cleansing formulations designed to remove sebum, dirt, and product buildup from hair and scalp. They typically serve as a base or delivery vehicle, though medicated versions may carry treatment actives.
| Reported effect | How often | Notes |
|---|---|---|
Scalp dryness or irritation | Common | Often linked to harsh anionic surfactants such as sulfates with frequent use. |
Eye irritation or stinging | Common | Occurs on accidental ocular contact, especially with foaming surfactants. |
Allergic contact dermatitis | Uncommon | Triggered by fragrances, preservatives, or specific surfactants in sensitized individuals. |
Hair dryness or brittleness | Uncommon | Stripping of natural oils with overly aggressive cleansers. |
Worsening of scalp conditions | Rare | Certain ingredients may exacerbate seborrheic dermatitis or eczema in predisposed users. |
Severe allergic or anaphylactic reaction | Very rare | Rare reports tied to specific allergens or additives. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.