Please allow me to comment. In 100% must use 1. Aloe Vera Gel (Heavy) 98% 2. Alpha Arbutin (Switzerland) 2% Mixing time If you want to use 100g you need 1. Aloe Vera Gel (Heavy) 98 g 2. Alpha Arbutin (Switzerland) 2 g, but if you want to mix 50g, you need 1. Aloe Vera Gel (Heavy) 49 g 2. Alpha Arbut...