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Resist C15 Super Booster

Brown spots don't stand a chance. Add a few drops of this booster to your serum or moisturizer daily, or use it alone. It's the new anti-aging superhero.
Item #: 777
  • Anti-Aging, Brown Spots, Wrinkles
  • For All Skin Types
  • Firms, brightens, and smooths skin

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Resist C15 Super Booster

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Customer Ratings:

84 out of 100
(Based on 482 Reviews)
Page of 20 Next »
  1. Lisa
    Reviewed on Friday, April 17, 2015
    100 out of 100
    • Rating
      Best / 4
    brightens my skin!
    • I first used this as a spot treatment, but then I started using it all over (mixed in with a serum) daily. My skin is noticeably brighter & looks healthier. I wasn't specifically looking for a brightening effect, & I don't have an issue with dull/sallow skin. It was a surprise because I didn't know my skin could look better - healthier - in this way until I saw it. I noticed the difference after about a week. It helps the overall functioning of my acne prone skin which is why I began using it.

  2. SEDA U.
    Reviewed on Wednesday, April 15, 2015
    100 out of 100
    • Rating
      Best / 4
    Uh what?! Holy Moly!
    • I had high hopes for this product and it exceeded my expectations. I already have great skin thanks to PC (I love you Paula!) and at 31, was starting to see fine eye area lines. This has diminished them in a week! A friggin week! Of use only once a day! So I started applying it twice a day and am excited to see the results. I do also use the Brightening serum and the retinol serum so not sure how much to attribute to them, but I feel like this one I can wear all over without worrying about acne!

  3. Janna K.
    Reviewed on Wednesday, April 15, 2015
    60 out of 100
    • Rating
      Neutral / 4
    Irritating
    • The ingredients look great for this product, yet for some reason my skin cannot tolerate it. I bought bottles of it on two separate occasions, hoping my second experiment with it would go better. Yet, even when mixed with a bland moisurizer, my skin became bright red and itchy. I am using the 25% PC vitamin C now (granted, as a spot treatment), and it doesn't irritate my skin like this stuff does. Another drawback is that it seemed to "liquify" any serum/lotion I mixed it with.

  4. Anonymous
    Reviewed on Wednesday, April 15, 2015
    100 out of 100
    • Rating
      Best / 4
    This works so well!
    • I'm young but my skin was looking rough from years of gratuitous unprotected sun and living with a smoking roommate. I thought I'd give this a try even though I wasn't expecting much. Within the first week I saw an improvement to over all evenness and healthy glowyness. It also improved things I wasn't expecting such as minor acne and even my dark circles from heredity by about 50% (although this seems temporary, if I stop using it for a few days the dark circles come back).

  5. Katie, W
    Reviewed on Tuesday, April 14, 2015
    80 out of 100
    • Rating
      Good / 4
    Love it so far
    • This really makes my skin more even and helps fade my freckles, overall making a more even skin tone. Is this safe to use in pregnancy??

    Customer Service Response
    Replied on: Tuesday, April 14, 2015

    Hello, and thanks for the question! This is safe to use during pregnancy. :)

    —Paula's Choice Research Team
  6. Ashley V
    Reviewed on Tuesday, April 07, 2015
    100 out of 100
    • Rating
      Best / 4
    Great for freckles
    • I have freckles mostly light to medium and because my skin is so fair I just look like I have blotchy skin. I use this about 3 times a week and have noticed significant fading in freckles. I am usually too embarrassed to be seen with no makeup but since using this serum I actually can feel comfortable in my own skin. I need to start using this religiously because my freckles would probably be close to non existent. Love this stuff and it doesn't seem to dry out my very dry skin.

  7. Sarah M.
    Reviewed on Sunday, April 05, 2015
    80 out of 100
    • Rating
      Good / 4
    Works for me!
    • I have the trial size of this product and have been applying a small amount of the vit c booster to my dark spots daily for a week. I use this in combination with the skin recovery kit. Between these two products, I have noticed a drastic difference in how dark those spots are. A few are almost all gone. The only complaint I have is that the trial size bottle was only half full when I received it. But if it keeps working this well, I plan to purchase the full size.

  8. Katherine R
    Reviewed on Wednesday, April 01, 2015
    20 out of 100
    • Rating
      Worst / 4
    Castor Oil???
    • Was very excited to find a dupe for the Skinceuticals CE Feurlic product. But castor oil used as a thickener? Not only does this seem like a really cheap move to pull considering the price of the product, but castor oil is known to promote hair growth. Anyone who struggles with facial hair or who doesn't want to promote facial hair growth should STAY AWAY. I am highly disappointed and disturbed that the use of this product may have already set back my laser hair removal investment.

    Customer Service Response
    Replied on: Thursday, April 02, 2015

    Hello, and thank you for contacting us! While castor oil can certainly add to hair's luster and overall appearance, there is no research indicating it has an impact on hair growth; therefore it is not a concern when it comes to the development of unwanted facial hair. It's actually a very beneficial emollient oil that is rich in fatty acids, which help contribute to preserving skin's barrier.

    —Paula's Choice Research Team
  9. I.G
    Reviewed on Sunday, March 29, 2015
    100 out of 100
    • Rating
      Best / 4
    love
    • I finally got to try this product in a sample size I was avoiding it before thinking is a little pricy for me and I don't think it would make that much difference, was I wrong. Smoothes wrinkles like nothing else and I have tried about all creams for very dry skin from PC's. I wear it under makeup it is so good, in fact I won't wear concealer unless I have booster C on. Only thing tiny sample bottle, I spilled half of it already. Now i have to try 25% C treatment.

  10. Kat L.
    Reviewed on Sunday, March 29, 2015
    60 out of 100
    • Rating
      Neutral / 4
    Decent
    • This has worked pretty well for my dark under-eye circles. However, it causes me to break out when applied to the rest of my face. My skin is pretty sensitive and breaks out quite easily so I'm not particularly surprised, but still a bit sad.

    Customer Service Response
    Replied on: Monday, March 30, 2015

    Hello, and thank you for sharing your experience with us - we're sorry to hear this didn't work as expected for you! Please contact a member of our Customer Care team for information on a possible exchange or refund.
     

    —Paula's Choice Research Team
  11. J.
    Reviewed on Thursday, March 26, 2015
    100 out of 100
    • Rating
      Best / 4
    I like it!!
    • I’m 36 with fair skin and large pores. I purchased the sample size after reading the reviews to give it a try. I like it! I’ve used it under my make-up during the day and noticed it seemed to have reduced the fine lines on my cheeks when I smile and it helped the damage on my chin I obtained from a diamond head microdermabrasion treatment. Also I noticed it made my skin very soft. The liquid dries quick, so I apply it one section of my face at time. I will add this to my skin care routine!

  12. Lauren
    Reviewed on Thursday, March 26, 2015
    100 out of 100
    • Rating
      Best / 4
    Overnight Results
    • I'm almost scared to review this because it seems too good to be true--I've used this only twice, and my skin is already noticeably softer. Even more, my pores look smaller, and my skin just feels smoother overall. This is my first Paula's Choice product and it's wowed me. I'll continue to try more products and keep suggesting this one!

  13. Lydia C.
    Reviewed on Monday, March 23, 2015
    100 out of 100
    • Rating
      Best / 4
    Best ever!
    • This serum has changed my skin more than anything. After about 7 weeks of consistent use in my routine, I haven't gotten anything more than the occasional tiny whitehead. My skin is softer, brighter and definitely less prone to breakouts and cysts because of this serum. My only advice is to introduce this into your routine gradually: start out once or twice a week and work your way up from there. And always patch test before applying it to your whole face!

  14. Susan H.
    Reviewed on Sunday, March 22, 2015
    100 out of 100
    • Rating
      Best / 4
    My HUSBAND noticed!
    • I received a sample from Birchbox and have been using 3 drops mixed with my PC serum for just over 2 weeks. I've had no problems with sensitivity or breakouts. My skin is noticeably smoother and feels softer. When my husband of 32 years tells me my skin look so smooth (no makeup!) I'm sold!

  15. Holly F.
    Reviewed on Wednesday, March 18, 2015
    20 out of 100
    • Rating
      Worst / 4
    bad reaction
    • I love PC products, but the C15 did not agree with my skin. I bought it a few weeks ago and just got around to using it last night. when I woke up this morning my whole face was bright red and felt like it was on fire. I have used vitamin c serums before and have never had a reaction to them. I look like I have a very bad sunburn. I will continue to use PC products, I love them. Unfortunately this one did not agree with my skin.

    Customer Service Response
    Replied on: Thursday, March 19, 2015

    Hello, and thank you for sharing your experience with us - we're sorry to hear this didn't work as expected for you! Please contact a member of our Customer Care team, who can assist you with a possible exchange or refund.

    —Paula's Choice Research Team
  16. Tina. A
    Reviewed on Tuesday, March 17, 2015
    60 out of 100
    • Rating
      Neutral / 4
    Color of the serum
    • I just received my trial size of C15. Is this liquid supposed to be golden/yellow or clear? Mine is the former color and i just want to be sure that it is fresh. Thank you.

    Customer Service Response
    Replied on: Tuesday, March 17, 2015

    Hello, and thanks for contacting us! C15 is fine if it has a clear to light of golden yellowish tone. Once it turns a deep yellow/orange or brown shade, it has become less active. We hope this helps!

    —Paula's Choice Research Team
  17. JOVY C.
    Reviewed on Thursday, March 12, 2015
    100 out of 100
    • Rating
      Best / 4
    Amazing
    • My type of skin is oily, and had problem of acne.. I start using Paula's Choice product last year and now my skin is clear! But this product vitamin C , wow my pores is getting smaller and my skin in brighten ! I am really satisfied the result... Amazing ....

  18. Nikki S
    Reviewed on Thursday, March 05, 2015
    100 out of 100
    • Rating
      Best / 4
    Holy grail
    • I was introduced to this product through a sample size I received with one of my orders. I was hesitant because I had oily skin so my biggest hope was that it wouldn't make me breakout or congest my skin up more than it already is. In the end, I ended up purchasing the full-size. I use this at night after my exfoliator and before my moisturizer. It's improved discolouration on my skin and has helped with post-acne scarring as well. This is definitely my go-to serum now.

  19. Lisa
    Reviewed on Tuesday, March 03, 2015
    80 out of 100
    • Rating
      Good / 4
    check out the trial size for a more affordable solution
    • I buy the trial size, which lasts awhile as a targeted treatment for stubborn acne and acne hyperpigmentsrion. I have sensitive skin and it works great when I dab on bit of this and then a bit of the BHA 9. I think it helps moisturize my skin and makes it less sensitive to the extra strength level of BHA 9. It is a fair price but still expensive, so I buy the trial size, which I can get to last - as an emergency spot treatment - for 3+ months.

  20. sandi b.
    Reviewed on Sunday, March 01, 2015
    100 out of 100
    • Rating
      Best / 4
    Solved everything
    • I have used the same skincare for years and felt it just wasn't doing the job. At 53 I know I am going through a lot of changes, however!!!! Decided to try PC a few months ago. I bought ALL of the serums, so I obviously made 2 mistakes, 1 ok and 1 great. Since I saw and felt results with PC very quickly I decided I would just use the mistakes at night. Worked out great. This C15 made them all better. The little too heavy mistake, this thins it downs and feels fantastic. Etc.Luv it&serums lol

  21. Ann K.
    Reviewed on Saturday, February 28, 2015
    100 out of 100
    • Rating
      Best / 4
    One of my Must-Haves
    • I ran out of this product for several weeks...now I have it again and the results are immediate. I love mixing this with a serum. My skin is more even toned, pores are smaller. From reading the other reviews, I'm surprised that some people aren't seeing any results. But then, while I love C15, I had no results with the 25% vitamin C spot treatment, and yet others have seen great results. The moral is---don't give up. There is a product for your skin.

  22. LORI P.
    Reviewed on Saturday, February 28, 2015
    100 out of 100
    • Rating
      Best / 4
    Good bye dark spot!
    • I was so happy to see that this C15 super booster has actually worked to dramatically fade a dime sized dark spot on my cheek that somehow showed up after my pregnancy. I suspect that it will continue to fade in time while using this product. I apply it directly to the spot and then add a few drops to Paula's moisture boost moisturizer daily for added brightness to my skin. I've been using Paula's products for 12 years and have been throughly pleased! ADDED BONUS-no animal testing! Thank you!!!!

  23. SHEREE M.
    Reviewed on Sunday, February 22, 2015
    20 out of 100
    • Rating
      Worst / 4
    resist c 15
    • I have loved every Paula's Choice product that I have consistently purchased for the last four years. The Resist C15 has disappointed me greatly!

    Customer Service Response
    Replied on: Monday, February 23, 2015

    Hello, and thank you for sharing your experience with us - we're sorry to hear this didn't work as expected for you! Please contact a member of our Customer Care team, who can assist you with a possible exchange or refund.

    —Paula's Choice Research Team
  24. Sophia H.
    Reviewed on Saturday, February 21, 2015
    100 out of 100
    • Rating
      Best / 4
    my skin loves it
    • I love this product so much that gives my skin brightening reflection after applied it. I just hope PsC could have large size such as 50ml /100ml, price might goes up, but I don't want to order every half month for this product. Yes, I use it up very quickly, and I love the result when I after put this on.

  25. Giselle S
    Reviewed on Friday, February 20, 2015
    20 out of 100
    • Rating
      Worst / 4
    Zero Results
    • I tried this product based on so many good reviews even though it was a bit pricey. I gave it time and used almost the entire bottle. I did not see any results whatsoever. I have been using Resist products now for quite some time and they have worked pretty well for my dry skin but there are times when my skin is dry in places and looks a bit dull. I thought this product might give my skin a little boost but am disappointed that it did nothing at all like the other reviewers raved about.

    Customer Service Response
    Replied on: Monday, February 23, 2015

    Hello, and thank you for sharing your experience with us - we're sorry to hear this didn't work as expected for you! Please contact a member of our Customer Care team, who can assist you with a possible exchange or refund.

    —Paula's Choice Research Team
Page of 20 Next »

What makes this product unique?
Resist C15 Super Booster is a concentrated, light-as-water liquid treatment product designed to supercharge your Paula's Choice serum, or it may be used alone. A blend of 15% stabilized vitamin C (l-ascorbic acid) at a pH of 3.0, antioxidant vitamin E, ferulic acid, and peptides repairs visible signs of aging and stimulates collagen production for smoother, brighter, and firmer skin.

Vitamin C also helps protect skin from environmental damage as it evens your skin tone. You'll see dramatically younger, healthier, and more radiant skin in weeks!

Who is this product for?
Resist C15 Super Booster is for anyone who wants to boost the results from their Paula's Choice serum or who wants to experience the benefits of vitamin C when combined with other proven anti-aging ingredients. The formula is suitable for all skin types and also appropriate for breakout-prone skin.

SOURCES TO SUPPORT THE CLAIMS MADE FOR RESIST C15 SUPER BOOSTER

Biochemical and Biophysical Research Communications, January 2013, pages 579–584; Journal of Cosmetic Dermatology, December 2012, pages 310–317; Journal of Dermatological Science, June 2012, pages 216–220; Journal of Drugs in Dermatology, January 2012, pages 51–56; AAPS PharmSciTech, June 2011, pages 514–520; Expert Opinion on Drug Delivery, July 2011, pages 905–919; Archives of Pharmacal Research, May 2011, pages 811–820; American Journal of Clinical Dermatology, April 2011, pages 87–99; European Journal of Pharmaceutics and Biopharmaceutics, May 2009, pages 232–238; and Archives of Otolaryngology, October 1999, pages 1,091–1,098.

Key Ingredients: ferulic acid, acetyl octapeptide-3, glycerin, panthenol, tocopherol, sodium hyaluronate, ascorbic acid

Product Ingredients:

Water, Ascorbic Acid (vitamin C/antioxidant), Ethoxydiglycol (slip agent/penetration enhancer), PPG-26 Buteth-26 (emulsifier), PEG-40 Hydrogenated Castor Oil (thickener), Tocopherol (vitamin E/antioxidant), Ferulic Acid (antioxidant), Sodium Hyaluronate (skin-repairing ingredient), Acetyl Octapeptide-3 (cell-communicating ingredient), Glycerin (skin-repairing ingredient), Panthenol (skin conditioning agent), Sodium Metabisulfite (stabilizer/antioxidant), Triethanolamine (pH adjuster), Phenoxyethanol (preservative).

DIRECTIONS: Apply once or twice daily after cleansing, toning, and exfoliating. Dispense 2–3 drops and add to your favorite Paula's Choice serum, or use alone and follow with moisturizer where needed. For maximum potency, we advise using C15 Super Booster within three months of opening.

If desired, apply your serum first and follow with this treatment. If applied in the morning, it is essential that you protect your skin with a sunscreen rated SPF 25 or greater. May be applied around the undereye area and is fine to mix with other Paula's Choice products.

Store in a cool, dark place, below 25°C (75°F). Keep out of direct light.

Detailed instructions on how/when to apply your Paula's Choice products can be found in our How to Put Together Your Own Skincare Routine article.

I received my C15 and the internal air restrictor isn’t in the bottle—it’s on the dropper. How do I insert it?

The internal air restrictor, as you noticed, is now packaged separately to reduce the likelihood of the bottle leaking during transit. There are two ways to insert it into your C15, and both are easy!

Option #1: Remove the seal from your C15, insert the dropper (do not remove the air restrictor from the glass stem) and screw the dropper cap closed. The cap will appear to tilt unevenly, but keep screwing it down and the internal air restrictor will snap into place. All done!

Option #2: Remove the seal from your C15, and then pull the air restrictor off of the glass stem of the dropper. Push the pointed end of the air restrictor into the open C15 bottle, applying pressure until it snaps into place.

We also have a handy “How-to” video here that provides visuals on both of the above options. Once the air restrictor is secure, it will not come loose or fall out—and now your C15 is ready for use!

Can you tell me more about the Resist C15 packaging, i.e. “packaged to minimize light and air exposure”?

Absolutely—a great deal of thought went into the packaging for this product! Because Resist C15 is a water-light liquid, a bottle and dropper-tip applicator were the only way to go for measuring the perfect amount per use while ensuring the product wasn’t messy to dispense. To protect the potency of the formula, tinted glass prevents UV exposure and an internal restrictor (when you pull the dropper out, airflow into the bottle is drastically reduced). In rigorous testing, these packaging safeguards were more than adequate to preserve the effectiveness of the Resist C15 Super Booster! For maximum potency, we advise using C15 Super Booster within three months of opening.

How long will the trial size last?

The C15 Trial Size is 3.5ml, and should last you 20-25 days of usage.

Can I use Resist C15 Super Booster with an AHA or BHA exfoliant?

This should be fine for those who are already using such products. If you’re new to using an AHA or BHA exfoliant, we suggest separating application of the exfoliant and C15 Super Booster; for example using one in the morning and the other at night.

How does Resist C15 Super Booster differ from your other antioxidant serums, including those that also contain vitamin C? Do I really need this product, too?

Resist C15 Super Booster is a specialized treatment product designed to supercharge the benefits all of our serums provide. It was created for those who want to boost the efficacy of their anti-aging skincare routine, as it works multiple ways to make skin look and act younger. If you're happy with the results from your serum alone, you probably don't need to add this; however, you may want to experiment with it, as you may be surprised by the additional improvements!

Resist C15 Super Booster contains more than double the amount of vitamin C as our other serums, though all of our serums treat skin to a proven combination of anti-aging ingredients. The 15% concentration of stabilized vitamin C in Resist C15 is an excellent amount to lighten stubborn brown spots, help fade red marks from acne, and significantly improve sun-damaged skin.

Is the effectiveness of Resist C15 Super Booster reduced if I mix it with other products?

No. The formula was designed to complement the ingredients in our serums and moisturizers.

Is it OK to mix Resist C15 Super Booster with my sunscreen?

No, you should never mix any skincare product with a sunscreen because it will dilute the sunscreen making it less effective. For best results, mix Resist C15 Super Booster with your serum each morning (or apply alone) and follow with your daytime moisturizer with sunscreen. In any daytime skincare routine, sunscreen should always be the last product applied.

Is Resist C15 Super Booster suitable for breakout-prone skin?

Yes! Not only is the texture water-light, the vitamin C plus other antioxidants and repairing ingredients work to reduce the inflammation and redness from acne, as well as encourage healing of red marks from past breakouts.

Is Resist C15 Super Booster suitable for rosacea-affected skin?

Maybe. The concern is the amount of vitamin C, which can be too potent for some cases of rosacea. We suggest sampling this product to see how your skin responds. Generally speaking, though, vitamin C's anti-inflammatory action on skin can be helpful for rosacea.

My skin tends to be sensitive to vitamin C but I still want to use this. Will applying it a few times per week still be beneficial?

Yes, of course. Although once or twice-daily application is recommended, you will absolutely still see benefits from Resist C15 Super Booster if it's applied less often. As with any skincare product, you need to pay attention to how your skin responds and adjust usage (or products) accordingly.

Can Resist C15 Super Booster be used as a skin-lightening product?

Research has shown that the amount of vitamin C the Resist C15 Super Booster contains can significantly improve brown spots and other sun-induced discolorations. Ideally, you'd want to combine Resist C15 Super Booster with one of our skin-lightening products with hydroquinone or niacinamide, but if your skin cannot tolerate those ingredients the vitamin C in Super Booster may be the solution!

You have several serums plus this booster product. Which one is best for me?

All of our serums contain a blend of anti-aging ingredients whose results are supported by published research, so which serum you choose comes down to skin type and personal preference, rather than one being better than the other.

It is also perfectly fine to use more than one serum; for example, you could apply Resist Ultra-Light Super Antioxidant Concentrate in the morning mixed with Resist C15 Super Booster, then at night apply Resist Intensive Wrinkle-Repair Serum. Resist C15 Super Booster works with any of our serums or, if preferred, you may apply this treatment as the serum step in your morning and evening skincare routine.

What color should Resist C15 be? My sample size has a pale yellow tint. Is that OK or should the product be clear?

C15 Super Booster should have a clear to a light yellowish tone. Although judging color can be somewhat subjective, the issue with destabilization of high amounts of vitamin C (ascorbic acid) comes into play once this vitamin begins to discolor significantly, i.e. turning a deep yellow/orange or deep brown shade. This is a sign the vitamin C has become less active which can occur over time, hence our recommendation to use this serum within three months of opening.

A minor color variation is normal for products that don't contain artificial colorants to maintain a consistent shade, so between batches there can be a subtle difference in shade due to the natural color of the raw materials used to make the product. This does not mean the product is ineffective or less effective than if it were colorless.

Should I store C15 Super Booster in my refrigerator to keep it fresh and potent?

No. The work to stabilize a formula (along with extensive testing) is done during the development process. Once this stage is complete and the product passes all testing, there are no special precautions for storing your products, save for keeping them out of long-term storage in very hot* or very cold environments. Despite the fact that the consistent cool temps of your refrigerator keeps your lettuce crisp, it’s actually detrimental to the stability of your carefully calibrated C15 Super Booster. To get the most from this treatment, keep it at room temperature and secure the dropper cap tightly after each use.

*A steamy bathroom such as can occur during a shower does not get hot enough to affect this product’s stability.

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