I've tested a lot of hair products throughout my career (so much so that I can easily point you to the best drugstore shampoos , the best deep conditioners , and the best split end treatments ), but even as someone who's tried it all, I never thought I'd see the day that a salmon sperm shampoo and conditioner would hit the market. That all changed when Medicube , the beloved affordable K-beauty brand , launched a PDRN haircare collection. If you know anything about PDRN (more on that later if you don't), then you know that it's exploded in popularity over the last year as a skincare savior with a lineup of celebrity fans that include Kim Kardashian , Jennifer Aniston , and Miley Cyrus . So of course I had to put the whole collection to the test and see if it could really deliver thicker, fuller hair . To see my honest thoughts on Medicube's new PDRN shampoo and conditioner, read ahead.…