Is Vita C Source the updated version of My Signature C Source?

Yes. Vita C Source is its evolution, with a new identity, modernized bottle and refined formula.

What is the texture like?

The serum has a lightweight, quick-absorbing texture that leaves skin feeling refreshed and smooth.

How many drops should I use?

After cleansing and toning, apply 2–3 drops evenly over your face. Gently pat to help absorption and leave the serum on.

Can I use it during the day?

Yes. When using the serum during the day, finish with SPF 30 or higher.

What is the guidance for sensitive skin?

If your skin is sensitive, mix the serum with toner or cream. Patch test before use because of the high vitamin C concentration, and avoid contact with the eyes.

How should I store this serum?

Keep it in a refrigerator or another cool place, protected from temperature changes, heat, light and air.

Can the serum darken or form crystals after opening?

The serum may become darker after opening, and white vitamin C crystals can form around the bottle.

Does it contain orange peel oil or limonene?

Yes. The ingredient declaration includes orange peel oil and limonene.

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TIAM

Vita C Source

What it is: A lightweight, concentrated facial serum with 20% pure vitamin C, created for dullness, uneven-looking tone, dark spots and rough-looking texture.

20% Pure Vitamin C
Brighter, More Even-Looking Tone
Smoother-Looking Texture
Lightweight, Quick-Absorbing Texture

Net weight: 15 ml

Vita C Source

15ml ·$11.99 USD

20% Pure Vitamin C

Brighter, More Even-Looking Tone

Smoother-Looking Texture

Lightweight, Quick-Absorbing Texture

Main active: Vitamin C
Intensity: Advanced

PRODUCT DETAILS

Vita C Source is the refreshed follow-up to My Signature C Source, with a modernized bottle and refined formula. At its center is 20% pure vitamin C in the form of ascorbic acid.

Reach for it when dullness, uneven-looking tone, dark spots or rough-looking texture are on your mind. It helps brighten and even the look of skin tone, soften the appearance of dark spots and leave texture looking smoother. The antioxidant-rich formula also helps protect skin from free radicals.

The texture keeps the experience simple. It is lightweight and quick to absorb, leaving skin feeling refreshed and smooth after application.

Vitamin E and ferulic acid support the antioxidant story, while panthenol offers moisture support. Niacinamide adds complementary care for uneven-looking tone, so vitamin C remains the clear lead without standing alone.

Learn more

GOES WELL WITH

1025 Dokdo Sun Cream$18.99 USD

100 Reedle Shot Stick Pouch$8.09 USD

1025 Dokdo Cream$24.99 USD

1025 Dokdo Eye Cream$22.99 USD

1025 Dokdo Pad$20.99 USD

1025 Dokdo Sleeping Pack$15.99 USD

1025 Dokdo Cleanser$11.99 USD

1025 Dokdo Lotion$14.99 USD

See how this concentrated vitamin C serum supports brighter, more even and smoother-looking skin.

Brighter-looking skin
More even-looking tone
Smoother-looking texture

Key Ingredients

Seven dry amber, apricot, lavender and celadon relief rays spread diagonally across one warm-ivory matte plaster surface beside a tiny coral point.

Vitamin C

An antioxidant ingredient family that can help brighten uneven-looking tone and soften visible dullness.

A translucent amber membrane curves across a low coral frame, casting a golden shadow on a pale blush surface, with a lavender tile behind.

Vitamin E

A Vitamin E family used for formula antioxidant support or conditioning—with evidence that depends on the exact form.

Translucent amber-toned abstract sculpture with flowing loops and rounded forms, set on a soft blush seamless surface with warm highlights and a gentle grounding shadow.

Ferulic Acid

An antioxidant that helps defend skin against environmental stressors and supports a resilient-looking complexion.

Panthenol

Pro-vitamin B5 that helps skin hold moisture and feel softer and more comfortable.

Niacinamide

Helps visibly brighten uneven tone and support the skin barrier.

Close view of an amber serum bottle with a black dropper and orange label on a pale green background.

Concerns & Benefits

Your Concerns

1
Dullness
When your complexion looks dull and you want a brighter-looking finish.
2
Dark Spots Hyperpigmentation
When visible spots and uneven-looking areas keep your tone from looking as even as you would like.

How To Use

1After cleansing and toning, apply 2–3 drops to your skin and spread the serum evenly over your face.
2Gently pat to help absorption, then leave the serum on.
3If your skin is sensitive, mix the serum with toner or cream, apply the mixture evenly and leave it on.
4When using the serum during the day, finish with SPF 30 or higher.

Small amber dropper bottle with an orange label centered on a pale green background.

Frequently asked questions

What form and percentage of vitamin C does this serum contain?

It contains 20% pure vitamin C in the form of ascorbic acid.

Keep learning

Customer reviews

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100 Reedle Shot Stick Pouch$8.09 USD

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TIAM Vita C Source 20% Vitamin C Serum, 15 ml | Sleepy Hello

TIAM

Vita C Source

What it is: A lightweight, concentrated facial serum with 20% pure vitamin C, created for dullness, uneven-looking tone, dark spots and rough-looking texture.

20% Pure Vitamin C
Brighter, More Even-Looking Tone
Smoother-Looking Texture
Lightweight, Quick-Absorbing Texture

Net weight: 15 ml

Vita C Source

15ml ·$11.99 USD

20% Pure Vitamin C

Brighter, More Even-Looking Tone

Smoother-Looking Texture

Lightweight, Quick-Absorbing Texture

Main active: Vitamin C
Intensity: Advanced

PRODUCT DETAILS

Vita C Source is the refreshed follow-up to My Signature C Source, with a modernized bottle and refined formula. At its center is 20% pure vitamin C in the form of ascorbic acid.

The texture keeps the experience simple. It is lightweight and quick to absorb, leaving skin feeling refreshed and smooth after application.

Learn more

GOES WELL WITH

1025 Dokdo Sun Cream$18.99 USD

100 Reedle Shot Stick Pouch$8.09 USD

1025 Dokdo Cream$24.99 USD

1025 Dokdo Eye Cream$22.99 USD

1025 Dokdo Pad$20.99 USD

1025 Dokdo Sleeping Pack$15.99 USD

1025 Dokdo Cleanser$11.99 USD

1025 Dokdo Lotion$14.99 USD

See how this concentrated vitamin C serum supports brighter, more even and smoother-looking skin.

Brighter-looking skin
More even-looking tone
Smoother-looking texture