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My Signature C Source

₱899.00 ₱719.00
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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.

View all from this brand
Sit tight, beautiful things
are worth the wait!

149 reviews

Share your experience with this product
4.2 out of 5
5 stars
4 stars
3 stars
2 stars
1 star
Top Reviewer
  • Skin Type Oily
  • Skin Tone Fair
  • Facial Features Chinita
  • Age 22

Goodbye acne scars!

I have a lot of hyperpigmentation and acne scars. This is truly effective. I saw a difference after an overnight use. Of course, this does not completely faded the acne scars overnight, but it definitely faded. This is a bit sticky though so i just use this during night time. I just use three drops for my whole face. I keep this in the fridge as it turns yellow when stored in room temp.

7 days ago
Certified Buyer
  • Skin Type Oily
  • Skin Tone Medium
  • Facial Features Morena
  • Age 25

Just Okay

Purchased this to lighten my dark spots, however, I did not notice a significant difference. Product has a medicated citrus scent, but is nothing offensive. Do keep this in the refrigerator and do not expose to light. My dermatologist explained that sunlight inactivates the product and causes it to "spoil." My serum turned dark after a short while, meaning it was no longer good to use. I personally would not buy this again.

13 days ago
Certified Buyer
  • Skin Type Oily
  • Skin Tone Medium
  • Facial Features Chinita
  • Age 22

Gives me breakouts! :(

It does lighten my marks, but sadly it also gives me small bumps that turns into big cystic acnes thus giving me another marks to treat. It also have that metallic orangey smell, but you'll get used to it. Sadly, I think this product is not compatible with my skin. It reacts badly though it also do what it claims to do. So for me to maximize the potential of this product, I am using this on my body instead.

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

Effective but Sticky

I really love this serum. It’s really effective as it gives me radiant, pinkish glow skin. The donwside I have for this serum is (1) it’s sticky which means that it’s not good as a day serum so better use it at night; (2) please be reminded that vitamin c is an acid so it can stain or discolor the collar of your shirt so be careful when applying on your neck. so therefore, the key takeaway here is that to use it at night. It blends well with other Tiam products and Cosrx. It’s a good serum as well if you’re doing some microneedling on your face.

about 2 months ago
Certified Buyer
  • Skin Tone Medium
  • Facial Features Morena
  • Age 21

Pricey but gives you clear skin

I was hesitant to buy this product as I have never tried any other serum aside from what my dermatologist had given me which was the best for me so far. But since I used it up, I thought I needed to buy and try a different one. When the package came, I noticed some brown spills on the packaging and check to see if it was properly sealed and it was. I thought maybe it was just residues of the product even before it was sealed. However, I opened the bottle and I noticed that it smelled like crushed vitamin C tablets... well, it is Vitamin C serum afterall! The liquid was kind of a rough consistency, para siyang dinurog na tablets mixed with a liquid... I put it on my skin after toning and it feels sticky. You have to wait for a couple of minutes for it to be fully absorbed by your skin. Then the next morning, I woke up to a brighter skin. I don't know if it was because of the serum or it was because of the face mask I applied that night. I liked the product and will continue to use it and see if there are any significance of using it. Overall, I rate this product 4. NOTE: DO NOT SHAKE THE BOTTLE or you'll waste the product. The liquid becomes frothy and fizzes up like a bottle of coke with a mentos candy inside it.

2 months ago
Certified Buyer
  • Skin Type Combination
  • Skin Tone Fair
  • Facial Features Mestiza
  • Age 28

Not for me

I bought this when it was on sale. I've have been wanting to try this since reading a lot of good reviews and watching video reviews on youtube. When I applied it at first, true to some people's claims, it stings a bit then it would go away after a few minutes. Then, it would feel like there's a thin film layer on your face. After days and weeks of using it, I didn't see any changes on my face. I didn't get any pimples though. I stopped using it after a few weeks of not seeing results. Maybe it's just not for me.

3 months ago
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