I've always had bad luck with serums as i find they always make my hair look greasy and worse than what it looked like before applying any serums. When using the mermade repar serum I find it makes my hair come to life and look fresh, not to mention its great scent as well whcih adds to its freshness. I find it works best for me after washing and apllying to the hair when wet then blow drying. It just adds that extra bit of luxury to my everday hair routine. I wish they made the bottle with a pump instead of a dropper as I find a pump more convinient and affective when its comes to serums.