Morus Nigra Root Extract

Morus nigra (black mulberry) root extract is primarily used as an antioxidant/brightening botanical (often for tyrosinase inhibition) and is typically included at low concentrations (about 0.1–2%) in leave-on products. While it is generally well-tolerated and not a common primary irritant, botanical extracts contain multiple phytochemicals that can trigger stinging or contact dermatitis in a small but meaningful subset of highly reactive or eczema-prone patients, especially in already-inflamed skin. Given this low-but-real risk and the lack of strong evidence supporting “exceptionally gentle” classification across compromised skin, it fits best as a gentle ingredient with minimal risk. Safety Notes: In commercial leave-on brightening/anti-spot products, Morus nigra (black mulberry) root extract is often used at very low levels (≈0.001–0.1%) as a label claim botanical within multi-extract blends. More performance-positioned serums/creams and some DIY-style high-extract formulas sold to consumers use higher loads (≈1–5%) when the extract is the primary actives story; above ~5% is uncommon due to supply form variability (solvent/glycerin/water carriers), color/odor impact, and stability/compatibility constraints rather than a specific regulatory cap.