Bests & Worsts Reviews from Amazon

Under my eyes is darker than I'd like - seems to have just started in the past year. None of the fixes I googled made any sense/were relevant, and none of the other stuff I've tried (The Ordinary, BaeBody) did anything. I usually wouldn't spend this much money on something so small - and I don't ever use Olay, but it was recommended (racked.com, maybe?) on a payday and I thought, "why not." ...IT WORKS. I have no idea how or why, but within 2 days the grey was noticeably lighter. Now a week later, and the difference is crazy. As someone who has never used a product that ever lived up to it's claims, I'm so confused! At first I was bummed. "Oh, it's just concealer," I thought when I opened it. Really expensive concealer. I dabbed it on, it doesn't go on like make-up, it didn't cover up the darkness like my concealer stick (Maybelline Instant Age Rewind Eraser Dark Spot Concealer). I was just expecting it to be a moisturizer that covered up the darkness, and it sort of seemed to. It wasn't until a couple of days later, as I'm looking in the mirror and I realize it's lighter under my eyes, that it became apparent it's doing...something. I thought it was just leftover make-up, maybe, but after I washed my face and didn't wear make-up for 2 days, the lightness was still there. So yes, this 100% has lightened the area under my eyes.