Hydraluron but it did nothing for me and it's massively overpriced - it's effectively the same as the Aldi serum which costs peanuts.
It's hyaluronic and nothing else - so if you have dehydrated skin you might like it but it won't be doing anything else for ageing, pigmentation etc which is what I'm paying serum money for!
Hylamide was £30 to Hydraluron's £24, lasts way longer and is a far more sophisticated formula with a shed load of useful ingredients.
I don't think Hydraluron is supposed to be your only serum, it's supposed to be in addition to a serum that does all the other stuff and they are v honest about this - but I am a skinflint so don't see why I should pay for two products when one will do 