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The MULTIPLIER™ Hi-Performance Vitamin C Serum


Night-time Use Highly Recommended

3X Penetration of Regular Vitamin C

2X Collagen Synthesis

Stable Tetrahexyldecyl Ascorbate plus Ferulic Acid


1 Fl Oz White Glass Dropper Bottle


In stock

The MULTIPLIER™ Hi-Performance Vitamin C serum uses stable, oil-soluble,Tetrahexyldecyl Ascorbate (THDA) and Ferulic Acid for OUTSTANDING anti-aging results.


  • 3x Penetration of L-Ascorbic Acid
  • 2x Collagen Synthesis
  • 50% Increase in Fibroblast Proliferation
  • 80% Decrease in Melanin Overproduction
  • Inhibits MMP Activity (MMPs are aging enzymes that decrease collagen synthesis)


Even sensitive skin can tolerate this superior formula. The pH is higher (less acidic so less likely to be irritating) plus the addition of  beta glucans soothes and hydrates the skin. Ferulic Acid boosts the THDA’s powerful anti-aging properties to give you faster results.

We recommend that the Multiplier™ Hi-Performance C Serum be used as your “night-time” vitamin C serum since it takes up to 3 hours to achieve the antioxidant properties that the L-Ascorbic Acid in our C+ Firming serum achieves immediately upon application.

So use your C+ Firming serum each morning for the ultimate in free radical protection and apply the Multiplier™ each night when your skin repairs itself and works to produce more collagen and elastin.

With 3x the penetration (all the way into the dermis) and twice the collagen synthesis, you can look forward to skin with the “snap back” of much younger skin.

For clinical information on Tetrahexyldecyl Ascorbate, click here.




Night-time use highly recommended for optimal collagen production. Apply to clean face, neck, decolletage and backs of hands after all water-based serums. May be mixed with CSRx Transforming Infusion, 10% Niacinamide Concentrate. Follow with an appropriate moisturizer or retinol/tretinoin product if needed.

Tetrahexyldecyl Ascorbate, Squalane, Beta Glucans, Ferulic Acid, Hyaluronic Acid

Water, Caprylic Methicone, Lecithin, Tocopherol, Jojoba Seed Extract, Sunflower Seed Extract, Rosemary Extract, Behenyl Alcohol, Glucoside, Xanthan Gum, Disodium EDTA, Trielhanolamine, Propanediol, DHEA, Maltodextrin

Night-time use is highly recommended.
Since skin repairs itself at night, the powerful collagen synthesis properties of THDA are particularly beneficial. More collagen, elastin and fibroblast activity, along with diminished MMP activity, means your skin will get firmer and more elastic very quickly.

This product can be used twice a day as a daytime C as well but the antioxidant protection from UVA and UVB rays take about two hours to become complete. We recommend daily sunscreen and using your Vitamin C+ Firming serum (L-ascorbic acid) in the morning for immediate UV radiation protection.

  1. :

    I have been using the Vitamin C+ Firming Serum and Niacinamide((CSRx Transforming Infusion Serum Concentrate) cocktail since the introduction of the CSRx Transforming Infusion products, so I had no hesitation in trying the Multiplier when it was introduced. I have not been disappointed and am ordering my 2nd bottle now. I love the creamy texture and blends nicely. I also can see results at a time when I am only wearing sunscreen.

  2. :

    I was introduced to the Vitamin C+ Firming serum last year and I have been using it during the day. I’ve been looking for a new night time serum as the last one I bought from a high end department store wasn’t worth the high price I paid for it. Enter The Multiplier. It was just the thing I was looking for! I’ve been using it for about a month and like the way it goes on my skin at night before I go to sleep. It has a light, pleasant smell and isn’t sticky or oily. I did have a huge zit last week so I hope it’s not related to this product. I plan to try it for 6 months before rendering my final verdict. I am 65 yrs old with problem skin my whole life. I believe I can see a difference!

  3. :

    I have been using Vitamin C+ Firming serum with Antioxidant defense complex for the evening regimen for a long time, but I decided to try the new Multiplier nighttime C.
    So far I have been very pleased with this creamy and silky texture and will definitely continue to use this for nighttime.

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