I have experienced great changes in my hair. I used to face serious hair loss problems. From the second bottle of collagen, hair loss stopped. Moreover, as I lift weights in my work, I had pain on my waist. Collagen has significantly improved the situation. I also climb stairs much easier than in the past. Please note that I live on the third floor and the building has no elevator. I also use stairs at my work. I really recommend Collagen to everyone!!!!!