Soybean extracts act as antioxidants and inhibit tyrosine kinase. In a 12-week clinical
study, mottled hyperpigmentation improved at least 1 grade in 90% of the soy treated
group, compared to 53% in the vehicle group (P≤0.05). Soy extracts have been proven
in vivo to modulate the protease activated receptor pathway (PAR-2) to reduce
melanosome pigment transfer for skin-lightening effects.