Beta arbutin is arbutin derived from plants like the bearberry and mulberry.
It is an ingredient for the skin lightening and whitening due to it being a tyrosinase inhibitor and a safe alternative to hydroquinone. Tyrosinase substances causing discoloration and freckles, discoloration and freckles occur due to reactive oxygen produced in skin by exposure to UV in sunlight, stress, atmospheric pollution, etc., which activates tyrosinase and the activated enzyme promotes the conversion of tyrosine in melanocytes (pigment cells) to melanin pigments. β-Arbutin is said to demonstrate whitening effects by reducing the production of melanin pigments by working directly on tyrosinase in melanocytes.