Can anyone recommend a good hair serum with UK availability that won't make my fine, dry hair sticky and nasty, but will help it recover some uumph!  I used to use Boots Natural Collection Japonica serum, which was excellent, but which has been discontinued.  I used tried a small size serum over the summer, I think it might have been one of those 'Takeaway' products.  It was pink, smelt vile and made my hair rough and nasty.  Anyone got any good ideas?