I don't know the pH ( Timelessha.com should be able to help--I find their customer service to be on point), but common sense would dictate that the solution was acidic, given it's high Vitamin C concentration. I can tell you that this serum WORKS...it's as efficacious as a Skinceuticals formulation I was using at a fraction of the $150 I was paying. Good luck!

Timeless Skin Care20% Vitamin C + E Ferulic Acid Serum - 4 Fl Oz - Lightweight, Non-Greasy Formula - Use Daily to Brighten, Restore & Correct Skin - Recommended for All Skin Types

Timeless Skin Care20% Vitamin C + E Ferulic Acid Serum - 4 Fl Oz - Lightweight, Non-Greasy Formula - Use Daily to Brighten, Restore & Correct Skin - Recommended for All Skin Types

Q: How long does this last?

In the dark glass bottle with dropper in the frig, the 120ml (4 oz) refill lasts my wife and I several months, transferring into small 10ml bottles for use. But just got it in a new plastic dispenser bottle that's (intentionally?) wasteful and unlikely to last. The product is unparalleled, but I'm sending this package back.

Q: Hi, is the product clear and not gone yellow? Last time I ordered it was all oxidised.

Hi there, common misconception is that this product is "bad" if it's not clear. Per the manufacturer: When freshly manufactured, the 20% Vitamin C + E Ferulic Acid serum is cloudy and thick in appearance, with slight yellowing. As the serum begins to age it starts to clear up, then begins with hints of yellowing, which is normal due to the Ferulic Acid, not the vitamin C. As long as it is in a yellow state, it is okay to use.

Q: How far out is the 4oz bottle expiration date (if you don't refrigerate it)? If you do refrigerate it, should it be put in fridge or freezer?

I honestly don't remember the exp dates, but I do keep it in the refrigerator and it stays nice and clear for several months (or until I use it up). I've been using this product for several years on my face, hands and arms and find the 4 oz is by far the best way to go. The prices flux considerably so keep an eye on that!

4.2/5

Product ID: 259983966

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Details

Skin type
Normal
Product benefits
Brightening
Scent
Collagen
Brand
Timeless Skin
Item form
Drop

⚡Boosts collagen synthesis

💧20% Vitamin C potency

🛡️Environmental defense

Frequently Bought Together

Timeless Skin Care Vitamin C Serum with Vitamin E & Ferulic Acid - Brightening Serum - for Oily & Dry Skin - Fragrance-Free - 4 oz

Timeless Skin Care Matrixyl Synthe’6 Serum - Face Serum for Skin Care - with Hyaluronic Acid for Hydration - Pouches

Timeless Skin Care Coenzyme Q10 Serum - Skin Care Serum for Smoothing - Fragrance-Free - Coenzyme Q10 - with Hyaluronic Acid - 1 oz

Description

✨ Unlock your skin’s timeless brilliance with every drop!

TEXTURE PERFECTED - Promotes healthy cell turnover to smooth uneven skin tone and texture.
YOUTHFUL RESILIENCE - Powerful collagen stimulation helps restore skin elasticity and reduce fine lines.
ALL SKIN TYPES WELCOME - Gentle yet effective serum designed to suit every skin type, ensuring universal appeal.
RADIANT GLOW EVERY DAY - High 20% Vitamin C concentration brightens and revitalizes dull skin for a luminous complexion.
LIGHTWEIGHT NON GREASY - Fast-absorbing formula ideal for daily use without heaviness or residue.

Timeless Skin Care’s 20% Vitamin C + E Ferulic Acid Serum is a potent, lightweight formula designed to brighten, restore, and correct skin daily. It stimulates collagen production, promotes healthy cell turnover, and protects against environmental stressors, making it suitable for all skin types seeking a radiant, youthful complexion.

Specifications

Manufacturer	Timeless Skin Care
Item model number	CEF-REFILL
Product Dimensions	6.05 x 6.05 x 16.28 cm; 113.4 g
ASIN	B00XBOUAAW

Have a Question? See What Others Asked

How long does this last?

What is the pH?

Hi, is the product clear and not gone yellow? Last time I ordered it was all oxidised.

How far out is the 4oz bottle expiration date (if you don't refrigerate it)? If you do refrigerate it, should it be put in fridge or freezer?

Reviews

4.2

All from verified purchases

I**A

great product

it was recommended to me by a dermatologiststart slowly

27.09.2024

S**I

Love this

I really love this vitamin c. I know it has 20%, but it really didn’t irritate my skin at all. Love it

9.04.2024

A**Y

Good in use i liked it

Good product

19.08.2019

A**D

Good

Excellent

28.11.2023

A**Y

Oxidized VIT C

came oxidized waste of money

3.04.2025

N**U

Average

Average product wont buy again

2.02.2025

J**Y

product genuine

the product was perfectly sealed and new … the seller was very accommodating when i asked him about the product.

7.08.2021

N**L

Great

Great product..not oxidized ..it’s good that I got a genuine product

15.06.2021

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Good experience, but the tracking updates could be better.

2 months ago

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Fantastic and great service. Shipping was faster than expected.

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