Spirulina Maxima Extract

Spirulina maxima extract is primarily used as an antioxidant/soothing botanical at low-to-moderate concentrations, but algae-derived extracts contain complex proteins and pigments that can trigger irritation or allergy in a minority of sensitive or eczema-prone patients. Human patch-test and real-world reports for algae/botanical extracts show generally good tolerability yet non-zero rates of irritant or allergic reactions, especially on compromised skin or when combined with other actives. Given the unpredictability of botanical extract composition and the higher risk in reactive skin populations, a mild (0.4) score is the safer clinically-aligned assessment. Safety Notes: In mass-market leave-on products (serums, creams, eye products) spirulina maxima extract is frequently used as a label-support/antioxidant claim ingredient at very low levels (~0.001–0.1%), consistent with typical supplier-recommended use rates for algae extracts and the low sensory tolerance (color/odor) of spirulina. Higher-concentration consumer products (mask packs, algae-focused gels/creams, and some natural/DIY-positioned items) can reach ~1–5% extract (or extract solids equivalent) before color, odor, and stability/compatibility become limiting; rinse-off masks more commonly tolerate the upper end than clear leave-on formats. There is no specific EU/FDA maximum for spirulina extract in cosmetics, so the observed range is primarily constrained by aesthetics, microbial control, and formulation stability.