Aphanizomenon Flos-Aquae is a freshwater blue-green algae (cyanobacterium) extract rich in proteins, vitamins, minerals, phycocyanin, and fatty acids, used in topical formulations for antioxidant and skin-conditioning effects. It is purported to support skin hydration, protect against oxidative stress, and provide soothing benefits.
| Reported effect | How often | Notes |
|---|---|---|
| Irritation or redness | Rare | Mild localized irritation possible, particularly on sensitive skin. |
| Allergic contact dermatitis | Rare | Hypersensitivity reactions to algae-derived proteins or extract components. |
| Microcystin contamination concerns | Very rare | Wild-harvested AFA may contain trace cyanotoxins (microcystins); reputable suppliers test for these, but contamination is a documented theoretical risk. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.