This is a great source of keratin and protein for hair. It’s a little on the pricey side, though. I put it in after I shower and wash my hair once or twice a week ONLY or else you will overkill giving your hair protein, making it so strong that it’s just brittle and it’ll be counterproductive. No product really repairs hair, even though they say they will. Products can add moisture, but you can’t fix a split end. It’s easy to use and you only need 1-2 pumps, even for thick and long hair. I don’t know that I’ve seen a super huge difference in my hair, but it’s also been curly all the time. I don’t use heat on my hair anymore so I can’t see the split ends. The one thing I know for sure is that my hair feels better. You can definitely tell my hair is healthier. It’s stronger. I still seem to have split ends about the same, but my hair had lots of coloring, bleaching, and heat damage that I’ve been trying to grow out for the past year or two, so split ends might be a thing just for me as I’m growing out damage. If this product really does give the ends of my hair the strength and protein the rest of my hair seems to feel like, I would say this is a good product.