Ascophyllum Nodosum Extract is derived from brown seaweed (knotted wrack) and is used in skincare for its antioxidant, hydrating, and skin-conditioning properties. It contains polysaccharides, polyphenols, and minerals that may help support moisture retention and protect against oxidative stress.
| Reported effect | How often | Notes |
|---|---|---|
| Contact irritation (mild redness or stinging) | Uncommon | Typically transient and associated with sensitive skin or high concentrations. |
| Allergic contact dermatitis | Rare | Possible in individuals sensitized to marine/algae-derived ingredients. |
| Iodine sensitivity reaction | Rare | Seaweed extracts contain iodine; relevant for those with iodine allergy or thyroid concerns. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.