So why does such an OG serum seem to work a lot better than so-called "newer" types? And why don't more companies use whatever this magic ingredient is??
Variations on the Turnaround serum have been around for just over 20 years. As it turns out, the dudes who discovered the magic ingredient (polyhydroxy acid, or PHA) patented it in the mid-1990s, which sounds about right. It apparently is only now able to be used by manufacturers without paying a license fee.
All that is a long-winded way of saying what a great product this is, and how ahead of its time it continues to be. I'm sure a whole bunch of PHA products will be turning up soon with this "new" ingredient, but I'm really glad I returned to this old favourite and might give the harsher acids a bit of a break in the meantime.