Which one are you looking at OP ?
The £19.50 is a 75ml tube
I've bought a 1000ml from QVC a while back IIRC it was £60ish but a special offer .
It is good stuff , there's a lot of meh about Elasticizer .
But you need to apply to damp hair , leave it the alloted time .
He's a Trichologist not a hairdresser and this was his orginal product .
It has a cumulative effect , first couple of times you think "What's the fuss" but then it kicks in.
www.qvcuk.com/Philip-Kingsley-Elasticizer-1-Litre.product.224171.html?sc=SRCH