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My Signature C Source

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CLAIM TO FAME: A best-selling serum that contains 40 times more Vitamin C than orange, 120 times more than strawberries, and 200 times more than mandarins

FAST FACTS: Packed with potent amounts of vitamins for beautiful, healthy skin; contains 6,000mg of 100% pure Vitamin C; helps prevent premature skin-aging; protects, softens and moisturizes skin; has 20% L-Ascorbic acid concentrate for gentle peeling and exfoliation

PERFECT FOR: Clearing out imperfections and dark spots

Note: Given the nature of Vitamin C, the serum may crystallize around the opening of the bottle. This does not alter the quality of the product.

Feb 29, 2016
”19, M, Oily Skin. This product is incredible. I have a lot of post acne scarring, general redness, and uneven skin; introducing C20 into my routine changed my face in a matter of weeks. I cant even really tell what it did- what I know is that my skin’s redness is much more subtle and that many of my imperfections have been smoothed. I put this on after cleansing and toning, and while I don’t know any of the science behind it, I feel like I can say that it helps all the next products i use become more effective. Make sure you wait 20 minutes after using it for best results.”
– Raynor14 (from amazon.com)

A cost-effective way to change your skin
Nov 4, 2015
”I started using this serum about a month ago and I have already seen big changes in my skin. I am in my mid-30s and suffer from Melasma and fine lines. After a month of use my skin texture is so much smoother and the Melasma that is above my upper lip has faded a lot.”
– MT (from amazon.com)
Holy Grail
Sept 8, 2015
”I have combination/oily skin. After about using thus product for a month, I saw that my acne has improved, my pores were reduced a little in size, and my skin complexion became more even. I would buy this again and I definitely recommend this product!”
– Marla Baconawa (from amazon.com)

WHAT YOU GET: (1) bottle My Signature C Source
Water, Ascorbic Acid, Alcohol, Sodium Lactate, Butylene Glycol, Glucose, PEG-60 Hydrogenated Castor Oil, 1,2-Hexanediol, Phenoxyethanol, Sodium Hyaluronate, Bis-PEG-18 Methyl Ether Dimethyl Silane, Xanthan Gum, Diethoxyethyl Succinate, Ammonium Acryloyldimethyltaurate/VP Copolymer, Carthamus Tinctorius (Safflower) Flower Extract, Citrus Aurantium Dulcis (Orange) Peel Oil, Glycerin, Zinc PCA, Panthenol, Niacinamide, t-Butyl Alcohol, Camellia Sinensis Leaf Extract, Beta-Glucan, Tocopheryl Acetate, Lecithin, Caprylic/Capric Triglyceride, Ubiquinone, Diisopropyl Adipate

STEP 1: Apply after cleansing and toning. Use 2~3 drops and smooth in gently all over face (especially over the aged areas such as pigmented or wrinkled lesions).
STEP 2: Initially, a slight tingling sensation may be experienced (a passing phenomenon).
STEP 3: Mix with several drops of toner to make your skin refreshed without feeling gooey.
STEP 4: After applying vitamin source C20, apply moisturizer to increase efficacy.

If you desire more hydration, use this product with the C20 Vitamin Sleep 9 to 5 Crema Sleeping Cream. After applying the C20 Vitamin serum, apply the sleeping cream over this layer. This combination will amplify the effects of Vitamin C.

Caution: When you use this product, please avoid using any products that contain high levels of AHA, BHA (include Betain Salicylate), Retinal, Vitamin C (Ascorbic Acid). Because of the hot weather, some vitamin serum can be leaked. But this is a natural phenomenon that can only happen to pure vitamins. When this happens, wipe leaked liquid, and keep it in fridge. Then you may use it without any problems.


Formerly known as C20, Tiam has one simple mission: “Helping you to be more beautiful.” Tiam believes that as long as you wish to be beautiful, you will be beautiful! This South Korean brand explores, all over the world, to find the best beauty products and introduce them to inspiring beauty explorers.

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155 reviews

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4.1 out of 5
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1 star
Certified Buyer
  • Skin Type Oily
  • Skin Tone Medium
  • Facial Features Morena
  • Age 21


This is my first time to use vitamin c and im so happy it didnt react badly to my skin. I've only used this for 2 weeks and it really delivers results! I also dont use this alone, i mix this with the aloe vera gel. I tried using it once alone and it gave me a pimple the following morning. I only use this during the night because it is sticky when it gets dry. I love how this erases my acne scars fast! And it also makes my face smooth and glowing! The only thing i dont like about it is it oxidizes so fast. When i got the product it leaked, crystallized a little bit outside and the serum was already light yellow. I also discovered to store it in the fridge so it'll be easier to use and lengthen its shelf life.

10 days ago
Top Reviewer
Certified Buyer
  • Skin Type Combination
  • Skin Tone Medium
  • Facial Features Morena
  • Age 23

it feels effective

Whenever I use this serum, my face feels a bit tingly. Somehow I feel that means it is effective? I might be wrong. Since I started using it, nothing really changed about my face, but it does feel refreshing. I will continue using it until the bottle runs out, and maybe I’ll see good results once I finish it. Anyway, it’s worth a try if you’re the kind of person who loves serums!

18 days ago
Top Reviewer
Certified Buyer
  • Age 22

thumbs 👎🏻

very disappointed with beautymnl :( got my package na nag leaked na yung laman ng serum and nag oxidized na sya such a waste of money sana hindi na mauulit ito nakakatakot na bumili lalo na if medyo pricey pa. hindi ko tuloy alam if this is effective ba or not tsk tsk

21 days ago
Certified Buyer
  • Skin Type Oily
  • Facial Features Morena


I will just rate this as fair since the claim is to see improvement on hyper pigmentation. Sadly l, it didn't think it helped lighten my hyper pigmentation at all. One thing that I would like to point out is that my skin where moisturized after a while of using it. Although the everytime you need to apply it, the product is bit sticky. It is best to apply and do this routine before bedtime.

23 days ago
Certified Buyer
  • Skin Type Oily
  • Facial Features Morena
  • Age 46

Great Find

One day, I came across this product on a beauty magazine that Ive been reading. I hurriedly check out beautymnl and thank goodness it is available here and if im not mistaken I also bought this with a discount thats why its a great find for me and for all of you out there, dont miss on the wonder of this vitamin C. Our skin deserves this! I apply this everyday after the toner and before my moisturizer and sunscreen.

about 1 month ago
Top Reviewer
Certified Buyer
  • Skin Type Oily
  • Skin Tone Fair
  • Facial Features Mestiza
  • Age 34

Truly amazing Vit. C serum by far!

I have been looking for the perfect Vit. C serum that is made from a high concentration of pure L-Ascorbic acid. And thankfully I finally found it when I saw this on sale here. It really helped make my skin glow and even out my skin tone and help fade some hyperpigmentation and post-inflammatory acne marks. Also a little goes a long way with this serum. Just make sure to keep it in the fridge when not in use and keep the lid tightly closed. Will definitely repurchase!

about 1 month ago
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