Kiehl’s Powerful-Strength Line-Reducing Concentrate uses some amazing skincare ingredients to help reduce fine lines and wrinkles and in this 30 day skincare product review, we’ll review how effective Kiehl’s Vitamin C serum is by comparing the before and after 30 day results!
Will the 30 day results show why Kiehl’s Powerful-Strength Line-Reducing Concentrate with Vitamin C is one of their best-selling skincare products?
Also, how fast does Kiehl’s Vitamin C serum start to show noticeable improvements to the skin?
Let’s find out!

What skincare ingredients are used in Kiehl’s Powerful-Strength Line-Reducing Concentrate Vitamin C serum?
Of course, the main active skincare ingredient in Kiehl’s Powerful-Strength Line-Reducing Concentrate is Vitamin C.
Vitamin C is a popular addition to many skincare products because it’s effective and helps the skin in many different ways.
However the Vitamin C used in this serum is a bit special because Kiehl’s actually developed and patented their own water-free Vitamin C, formulated with 10.5% L-Ascorbic Acid and 2% Ascorbyl Glucoside.
What does this mean?
Simply, it means that Kiehl’s Vitamin C is much more stable and absorbs efficiently deeper into the skin so that this serum is effective for much longer![1]

Vitamin C is an extremely effective skincare ingredient and Kiehl’s completes this serum by adding moisturizing skincare ingredients such as:
- Hyaluronic Acid
- Glycerin
- Natural Oils
With all these effective skincare ingredients packed into this serum, does Kiehl’s Powerful-Strength Line-Reducing Concentrate help reduce fine lines and wrinkles in as little as 2 weeks?
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How good is Kiehl’s Powerful-Strength Line-Reducing Concentrate for wrinkles in 30 days?
For this 30 day skincare product review, we use a very simple skincare routine to see how effective Kiehl’s Vitamin C serum really is:
- AM & PM Skincare Routine:
- Wash skin with warm water and Mrs. Meyer’s Clean Day Liquid Hand Soap.
- Apply Kiehl’s Powerful-Strength Line-reducing Concentrate.
- Use mineral sunscreen whenever necessary.
Remember, we use minimal skincare products for our reviews to see how these products really affects the skin and if the improvements to the skin are actually noticeable.
With that in mind, let’s see if using Kiehl’s Vitamin C serum for 30 days delivers some spectacular results!
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Results after using Kiehl’s Powerful-Strength Vitamin C Serum for 2 weeks
For this skincare product review, we apply Kiehl’s Vitamin-C serum to the left pinky finger.
So, is 2 weeks enough time to start seeing visible improvements to fine lines on the skin?
Surprisingly, yes!


After 2 weeks of daily serum application, there really is a noticeable improvement in the fine wrinkles and the smoothing around the cuticles.
It’s clear that the skin cells are looking more “plump”, leaving the skin more textured.
Even though the lighter wrinkles are smoothing out, it seems to be too early to see improvement in the deeper joint wrinkles.
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Kiehl’s Powerful-Strength Line-Reducing Concentrate Before and After 30 Day Results
It’s easy to see why Kiehl’s Powerful-Strength Vitamin C serum is a fan favorite and one of their best-selling skincare products.
This serum delivers some spectacular results!


The “plumpness” is even more apparent after 30 days and also notice how the skin is much more texturized and smoothed out.
Even the deeper wrinkles on the joints looks to be shallower and more hydrated.
However, we noticed something completely unexpected.
Kiehl’s Powerful-Strength Line-Reducing Concentrate completely lightens the skin as well!
We didn’t expect to see such a noticeable difference, but the lighter skin tone is obvious in natural daylight.
This shouldn’t have been that big of a surprise though because Vitamin-C is an excellent skincare ingredient commonly used in brightening serums because of it’s skin lightening properties.
After seeing these results, we recommend applying this product evenly to the entire skin, not just spot treating problem areas!
(Ex: Forehead, crowfeet, 11’s, laugh lines, wrinkles on neck etc..)
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Kiehl’s Powerful-Strength Line-Reducing Concentrate Product Review
After using this Vitamin C serum for 30 days, here’s a few things we noticed that might help you deicide if Kiehl’s Powerful-Strength Line-Reducing Concentrate is right for your skincare routine:
Is there a warming sensation when using Kiehl’s Powerful-Strength Line-Reducing Concentrate?
It’s not an irritation, rather a warming sensation caused by the skincare ingredients activating when the serum is being applied to the skin![1]
Does Kiehl’s Powerful-Strength Line-Reducing Concentrate leave any sticky residue on the skin?
No sticky residue formed on the skin after application.
Is there any fragrance in this Vitamin C serum?
However, it isn’t overwhelming or perfumy and the scent dissipates after a few minutes!
Where can I store Kiehl’s Powerful-Strength Line-Reducing Concentrate?
To keep this serum effective and “fresh” for as long as possible, be sure to read our guide on storing skincare products!
Does this serum cause any discoloration?
Try to avoid getting this serum on the fingernails to avoid discoloration.

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Disclaimers
- This is not a sponsored post and the featured product was purchased using our own funds.
- We hope you use this information to help you create your own skincare routines.
- This is not medical advice so if you have any questions regarding your skin, please consult with your dermatologist!
- Remember, these are our results and yours may differ as skincare products affects all skin differently.
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