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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:

85 out of 100
(Based on 408 Reviews)
Page of 17 Next »
  1. Melissa F
    Reviewed on Tuesday, November 25, 2014
    40 out of 100
    • Rating
      Poor / 4
    Didn't do a thing for me
    • Second bottle of this I am on now. Have not notice any difference in my skin whatsoever. Still the same sun spots, nothing new, nothing different. When you get to the bottom of the bottle, this serum is extremely hard to get out, due to the eyedropper. Will not purchase again.

    Customer Service Response
    Replied on: Tuesday, November 25, 2014

    Thanks for your feedback! We're sorry this product didn't work for you. Unfortunately, some dark spots are very stubborn. We trusy you were applying a broad spectrum sunscreen every day, as this is a key element in the battle against brown spots, both for lightening current ones and prevention of new ones. Please contact us if you need asisstance with a return or exchange.

    —Admin
  2. Alicja
    Reviewed on Monday, November 24, 2014
    40 out of 100
    • Rating
      Poor / 4
    half broken lid
    • Recently I started using this product since I think it helps my skin keep moisture. I ordered one couple of days ago and received the package today. However, I am disappointed since the lid was half broken and most of the product spilled. There is hardly anything left in the bottle. It was pretty expensive so I feel bad that all is ruined now. Is there any reimbursement you could offer me?

    Customer Service Response
    Replied on: Tuesday, November 25, 2014

    Absolutely! Please reach out to a member of our Customer Care team, who can help provide you with information about an exchange or refund. You can find all their contact information here.

    —Paula's Choice Research Team
  3. pam
    Reviewed on Sunday, November 23, 2014
    60 out of 100
    • Rating
      Neutral / 4
    hydrogenated castor oil?
    • got a sample since i've been looking for a C serum since i'd like to avoid hydroquinone which can be a trigger of vitilligo. [fortunately none of the "white patches" is on my face (yet)] (am not sure if it's doing anything. too early). then i saw PEG-40 Hydrogenated Castor Oil as a thickener. surely Paula's resourceful team can find some other thickener that is not "hydrogenated"?

    Customer Service Response
    Replied on: Monday, November 24, 2014

    Hello, and thank you for your comments! Hydrogenation in skincare is a process that helps stabilize some of the beneficial ingredients and keep them from going bad over time; though hydrogenation is not good for products that are ingested, it is safe for use in topical products. We hope this helps answer any questions you might have!

    —Paula's Choice Research Team
  4. Deborah B.
    Reviewed on Sunday, November 23, 2014
    20 out of 100
    • Rating
      Worst / 4
    Not for me
    • I received a sample, but all of the product had leaked out. I never had a problem with my Skinceuticals CE Ferulic...other than the price! I had tried the Timeless brand that one of the Vloggers on Youtube recommends, but it didn't seem to do anything for me. So, based on other reviews & info from Beautypedia I decided to go ahead and order this. Even when I mix with moisturizer it has caused breakouts & irritation. I so wish I'd gotten another sample before making purchase! Can't use this!

    Customer Service Response
    Replied on: Monday, November 24, 2014

    Hello, and thank you for contacting us about your experience - we invite you to reach out to a member of our Customer Care team for information about a possible exchange or refund in this case.

    —Paula's Choice Research Team
  5. Sara C.
    Reviewed on Thursday, November 20, 2014
    80 out of 100
    • Rating
      Good / 4
    Great product, but be careful with the trial size bottle.
    • I got the trial size C15. I used the drops 3 times before knocking the bottle over! I was loving the product and felt it was actually doing something. Unfortunately, the bottle is so tiny and unstable that I knocked it over at least 5 times when the lid was on. I should've known better when I took the cap off. So just a warning to you! Great, otherwise!!!

  6. M. P.
    Reviewed on Monday, November 17, 2014
    100 out of 100
    • Rating
      Best / 4
    Outstanding!
    • Amazing increase in overall brightness, smoothness, softness, dark spot reduction, and just a clean, fresh-faced glow. I'm curious about the sustainability of the product packaging since air and light hits it every time you open it. PC is always so careful about that, so I'm hoping it's not enough to damage the product. Regardless, I plan to keep this effective product in my routine for years to come!

  7. Stephanie J.
    Reviewed on Monday, November 17, 2014
    100 out of 100
    • Rating
      Best / 4
    My first holy grail skincare product
    • This makes my skin feel super soft and smooth, and takes away some dullness. I truly love this product, and will always have this in my line-up. That said, I bought my first bottle in June, and still had half left by September (using 3 drops day & night). I had to throw it away because there was discoloration & stickiness, so that was disappointing. I bought a sample bottle in October, and still have 1/3 left a month later, so I'll probably just be buying sample bottles from now on.

  8. India F.
    Reviewed on Saturday, November 15, 2014
    100 out of 100
    • Rating
      Best / 4
    GREAT Product
    • My Mom gave me this for Christmas and I have been using it all year - adding it to my nighttime serum or moisturizer. LOVE it! My skin is glowing. Can't beat the price either.

  9. Caitlin S.
    Reviewed on Thursday, November 13, 2014
    40 out of 100
    • Rating
      Poor / 4
    Bad smell
    • I realllllly want to like this product because so many PC products have worked for me, but the smell is just awful! it lingers on my skin all day and my boyfriend can't stand it. It's comparable to the smell left on your skin after going into a tanning bed, but worse! Not sure if I just got a bad batch, anyone else experiencing this? So gutted.

    Customer Service Response
    Replied on: Monday, November 17, 2014

    Thanks for your comments! We doubt you got a bad batch, as such a batch wouldn't have been approved for sale, not to mention we sell this so quickly it doesn't have much time to sit around and potentially go bad. All of our products have a scent that comes from the combination of ingredients used, rather than added or masking fragrances. As how things smell to one person vs. another can be so different, we're aware not everyone will be equally pleased with the scent of a given product and how that product reacts on their skin. Please contact us for a complete refund or we can also help you exchange this treatment for any other Paula's Choice items.

    —Admin
  10. Bren
    Reviewed on Thursday, November 13, 2014
    100 out of 100
    • Rating
      Best / 4
    Nice, especially for the price
    • Good quality and reasonably priced. Thank you for making a good skin care routine within reach for all kinds of budgets.

  11. CARRIE W.
    Reviewed on Sunday, November 02, 2014
    100 out of 100
    • Rating
      Best / 4
    Completely done with assuming I know my own skin well.
    • Not long ago, I was of the opinion that my skin could not tolerate high doses of Vitamin C. I'm on one heck of a roll with Paula's Choice at the moment, so I thought I'd give the C15 Booster a try. I'm really glad I did, because it causes me zero irritation, and soon I'll have fewer spots to look at. Just a few drops twice a day, and I'm already seeing improvement. The trial size is big enough to really see how your skin will respond. Highly recommended.

  12. JP
    Reviewed on Friday, October 31, 2014
    100 out of 100
    • Rating
      Best / 4
    Love this!
    • Received a sample and decided to try as I had not previously used a serum. After a couple of uses I could see an evenness in my skin appearing. Bought two full size bottles and have been using twice a day for two months. The red spots from acne have disappeared and dark spots are diminishing. I'm 57 and my skin is extremely oily and acne prone. My skin quickly absorbs Resist C15 and it does not make my skin even more oily. Has a light consistency. Stocking up as I don't want to be without it!

  13. tisha s
    Reviewed on Wednesday, October 29, 2014
    40 out of 100
    • Rating
      Poor / 4
    Caused breakouts on my forehead on chin
    • I use this product for about 2 months and I kept breaking out but I thought I was mixing too many products so I eliminated some items and kept it simple and kept the vitamin C in the mix and realize that was what was causing my problem did not work for me

    Customer Service Response
    Replied on: Thursday, October 30, 2014

    Hi, and thanks for contacting us - we're sorry to hear this one didn't work out for you! We recommend contacting our Customer Care team, who might be able to help you with a return or exchange.

    —Paula's Choice Research Team
  14. Linh
    Reviewed on Tuesday, October 28, 2014
    80 out of 100
    • Rating
      Good / 4
    Good product
    • I love this product, absorbs quickly to your skin, fade away dark spots and no tackle. However I don't like the package. When I close the cap, it is not tight enough and some leaks out. I am so sad about this 'cause it is quite expensive for me. Besides, when there is few left in the bottle, it is hard to take out the liquid completely. I hope that Paula's Choice team will enhance the package and hopefully, there will be a discount on this item. I would buy it again if it were less expensive.

  15. Mary C.
    Reviewed on Sunday, October 26, 2014
    40 out of 100
    • Rating
      Poor / 4
    Nice texture but doesn't do much
    • I'm in my early 50s and have dry, fair skin with sun/age spots. I've been using C15 serum for 2 months to fade dark spots & minimize wrinkles. I apply some directly on the spots, then add a few more drops to whatever serum I'm using. It sinks in quickly and it's very thin (almost water-like) so it's easy to mix with other lotions & serums. Has no odor at all & is not irrit. Bottle/dropper is really nice; wish Paula would use this for other serums. BUT it's done nothing for my spots or wrinkles.

  16. Julie C.
    Reviewed on Wednesday, October 22, 2014
    100 out of 100
    • Rating
      Best / 4
    Amazing! Great for uneven skin tone & acne redness
    • I have tried so many serums to even out my skin tone. This is amazing. I have seen a dramatic difference in my skin. My dark spots seem lighter and my old red acne scars are dissappearing. It is really light and does not leave your skin oily. No issues with breakouts, etc. I have oily acne prone skin (with occassional cycstic acne as well). I use it after cleansing and toning (PC clear line) and before applying moisturizer, twice a day. I barely wear make up now.

  17. laura v.
    Reviewed on Friday, October 17, 2014
    60 out of 100
    • Rating
      Neutral / 4
    smooth even toned skin...with a big shine :\
    • Been using it for a few days and my skin is already brighter, more even toned, and smoother... BUT, no matter how I use it, how much, etc., it leaves me a shiny mess! I can use three drops, or seven, or any in between, and my face will always end up super shiny :( Gonna have to use it solely at night it seems... But that worries me cause I also use Differin at night, so I don't know how they might interact.

  18. Anonymous
    Reviewed on Friday, October 10, 2014
    100 out of 100
    • Rating
      Best / 4
    Vitamin C- Who knew?
    • I have very oily, acne prone skin, and now in my 40s, I'm seeing some fine lines. I've been doing remarkably well with PC products, and simply purchased a sample of this on a whim after seeing the excellent reviews. I didn't think I'd do well with this because it seems a bit oily in texture, but OMG, my skin drinks it in! After a couple of weeks of using this twice a day, my skin looks more radiant and smooth. I dabbed a little on some recently-faded acne spots, and they've faded quickly!

  19. Virginia S
    Reviewed on Friday, October 10, 2014
    60 out of 100
    • Rating
      Neutral / 4
    Too sensitizing for me
    • While this product is amazing for most of my skin, it seems to trigger outbreaks of eczema on the skin around my eyes (which has never happened to me before). I went through a bottle of C15 last winter without problems, but for some reason my eyes couldn't handle it this time around. I have tried to keep it far away from my eyes when I apply it but having it anywhere on my skin seems to throw the skin around my eyes into a frenzy. I'm sad I can't use this anymore, it's a great product.

  20. Nancy P
    Reviewed on Thursday, October 09, 2014
    100 out of 100
    • Rating
      Best / 4
    Great product
    • I love this serum! It may be the first among my favourite PC products. I have noticed greater skin clarity and diminished discolouration. As for Paula's customer service, it is absolutely exceptional. The women I have dealt with have been unfailingly polite, knowledgeable and kind.

  21. Anonymous
    Reviewed on Monday, October 06, 2014
    80 out of 100
    • Rating
      Good / 4
    Great product but it turns yellows?
    • I love it so much! I brought it back to my country where it is humid and super hot all the time,and this serum still worked perfect.It doesn't give me breakouts,and keep my skin in control. BUT something really strange happened.I put it in my check-in luggage on my way back to the US.When I arrived home I took it out, and it turned yellow! It still smells the same, but I'm just afraid that it is not safe to use it anymore.I want to know what happen and if it's still safe to use it. HELP!

    Customer Service Response
    Replied on: Wednesday, October 22, 2014

    Hello, and thanks for your question! Here is some information from our FAQ on C15:

    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.

    —Paula's Choice Research Team
  22. Samantha R.
    Reviewed on Monday, October 06, 2014
    100 out of 100
    • Rating
      Best / 4
    Possibly my favorite skin care product (ever)
    • Ah-mazing. This is a (superior?) dupe for the SkinCeuticles CE Ferulic. I've been mixing it in with my PC Skin Balancing Antioxidant Serum w/Retinol. I've ABSOLUTELY noticed brighter, plumper skin as well as diminished fine lines. Also, so much love to the PC Customer Service team: After I left the cap off this bad boy one night, I sent them a message asking if I should replace it (this becomes much less effective after it oxidizes). They sent me a brand new, full size bottle for free! <3

  23. Jill S.
    Reviewed on Saturday, September 27, 2014
    60 out of 100
    • Rating
      Neutral / 4
    Not as Effective as I'd Hoped
    • I have slightly oily, acne-prone skin and I was hoping this product would help fade brown spots and post-acne hyperpigmentation. I mixed C15 with the PC Skin Balancing Serum but I never noticed any beneficial results and in fact, when I used C15 all over my face it caused blackheads on my forehead (but not elsewhere). Because of the blackheads I switched to using C15 as a spot treatment on marks I wanted to fade, but didn't notice any improvement. This might work better on more mature skin.

  24. Jill K.
    Reviewed on Wednesday, September 24, 2014
    100 out of 100
    • Rating
      Best / 4
    Great Vit C serum for the price!
    • Love this product! I use this morning and night and it has diminished my under eye dark circles and just overall improved my skin. My acne marks have faded and my skin is brighter. I will definitely buy again!

  25. Julie F.
    Reviewed on Tuesday, September 23, 2014
    40 out of 100
    • Rating
      Poor / 4
    Didn't work for me
    • I gave this product 2 stars because I believe that this product works for some, but unfortunately, it did not work for me. I have been using PC skin care for years and love the Resist line. I don't know if by using the other products my brown spots are reduced as far as possible. For whatever reason, it did not change for me. Thanks for putting out such great products and customer service!

Page of 17 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 15 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 a retinol or prescription retinoid product?

Yes. Resist C15 Super Booster beautifully complements the benefits from retinol, and research has shown it is fine to use these two ingredients together. In fact, retinol has been proven to be more effective when combined with vitamin C. Applied together, they are a formidable defense against free-radical damage that ages skin.

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 Retinol 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.

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