FREE Olay Retinol24 Serum & Moisturizer Sample Posted On June 20, 2020 Get a FREE Olay Retinol24 Serum & Moisturizer Sample! Click on the “Show AD” button. Then it will take you back to your own timeline. Scroll down a bit and you should see the Olay ad. Click on the “sign up” button. You will fill out your shipping info and submit.