Amazon has this 4% niacinamide serum for $49.99. When you apply the 50% off coupon, the code JETMUXZL, and check out with Subscribe & Save, you can pay as little as $9.99.
In order to get the highest discount, you need to have five or more subscriptions delivered in the same month to a single address.
Be sure to browse more beauty deals on Amazon.
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