I used go-kera for the first time and waited a few weeks, so I can review the product. I absolutely loved it, as I had some new hair growth which was frizzy, now those hairs and smoother and blended in well with my long hair. At the start my hair was 100% straight, but after 4 weeks or so, my natural wave started to appear which exactly what I want, I don't want my natural hair wave to disappear, so I am very happy with this product and will definitely purchase it again. The only feedback is after using and washing my hair, I started to notice a semi-chemical smell in my hair. Also the shampoo, conditioner and the hair mask smell amazing :) Thanks Felipe!