slow beauty logo

Want to know if a product really works? Welcome to Slow Beauty. Since it can take up to six weeks to see results from using a new formula, we have testers try the best and buzziest in hair and skin care for double that amount of time to determine what actually makes a difference.


Due to the nature of my job, I’m constantly in a hamster wheel of trialing beauty formula after formula, and after a while they tend to blur together. It’s honestly pretty rare that a skin-care product impresses me enough to land a permanent place in my routine. Eucerin Radiant Tone Dual Serum, which helped visibly reduce the appearance of my dark spots over a span of 12 weeks, is the latest to earn entry into that inner circle.

Eucerin spent 10 years on research and development to finalize the products in the new Radiant Tone collection. The line’s star ingredient is Thiamidol, a patented compound that helps treat and prevent the appearance of dark spots with continued use. The Radiant Tone Dual Serum also contains hyaluronic acid to hydrate.

When I first started using the serum, I was hoping it would sufficiently moisturize my skin (so I wouldn’t have to layer another serum on top) and fade the dark spots that have populated my cheeks and temples for years. Keep reading to find out what actually happened during and after I incorporated Eucerin Radiant Tone Dual Serum into my routine for a full 12 weeks.

eucerin radiant tone
Courtesy of Eucerin

dark spot corrector serum in a bottle next to its box
Courtesy of Eucerin

eucerin slow beauty
Carol Lee

Final Thoughts

Although my original spots weren’t very dark, there were so many of them that my eyes always immediately gravitated toward them in the mirror. Now all I see is luminous, clear, healthy-looking skin. Some of the dark spots are gone entirely, and the remaining ones appear significantly lighter.

I keep flipping back and forth between my before and after photos, and even though I lived it, I can’t believe the results. I definitely recommend Eucerin Radiant Tone Dual Serum to anyone looking to combat dark spots—and I can’t wait to break open another bottle.

Eucerin Radiant Tone Dual Serum Dark Spot Corrector

Radiant Tone Dual Serum Dark Spot Corrector