The Accelerated Growth collection is the best, I used that with the lightweight serum and I will never go back. 10/10 - my hair feels so soft and healthy after using these products send it has gotten thicker. Excellent customer service as well. My package was lost at the post office because I forgot to add my apartment number, and when I contacted them they were very nice and worked with me to try to get my package found at the post office. I got it and didn't have to wait for them to resend me another package! Great company.