Plankton Extract

Plankton Extract is typically used at low concentrations as a conditioning/soothing bioferment in moisturizers and serums, and it is generally well-tolerated in clinical use with low rates of irritant reactions. However, as a complex marine-derived mixture (proteins/polysaccharides/trace components), it carries a small but real risk of irritation or sensitization in highly reactive or eczema-prone skin compared with truly inert bases. Considering compromised skin barriers and cumulative exposure in routines, I rate it as gentle but not exceptionally gentle. Safety Notes: In mass-market leave-on skincare (serums, creams) and rinse-off cleansers, plankton/algae ferment-type extracts are often used at very low “labeling” levels (down to ~0.0001–0.01%) as part of multi-extract blends or to support marketing claims. Most mainstream formulas cluster around ~0.05–1% depending on supplier strength and whether it’s a concentrated ferment (e.g., “plankton ferment/lysate”) versus a dilute extract. High-strength consumer-available boosters/ampoules and mask/serum concentrates can reach ~2–5% active extract/ferment (not including the solvent carrier), with higher levels generally limited by odor/color, stability, and cost rather than specific regulatory caps.