I’ve never had a lot of hair and the little I have is very fine and with 0 volume. I just got on with it until recently I noticed I was losing even more hair than normal and my scalp is very visible. So out of desperation I bought this and I have to say it’s slow going but it does work. I have used a whole bottle and just purchased another (FYI it’s a fiver cheaper on Amazon, you’re welcome) and this morning I have noticed I have a whole lot of baby hair growing along where I’ve been applying the serum. I have also noticed that my hair has a lot of volume - I’ve spent a fortune over the years in volumising mousses and such but at the moment the only product I’m applying is this serum and after blow drying my hair the volume is just amazing!  I can’t say it’s a miraculous product, you won’t wake up with a thick mane of hair all of a sudden, but I’ve had really good results so far and will keep applying it every day.