Is 20% vitamin C too strong for sensitive skin?

It is a high concentration, so start with a few drops every other day and build up. The formula is fragrance-free and labeled for all skin types, but patch test first if your skin reacts easily.

When should I apply it, morning or night?

It can be used AM or PM. In the morning, apply it before moisturizer and sunscreen, since vitamin C supports protection against environmental damage.

How much should I use?

A small amount, about three to four drops, covers the face. Using more is what buyers say can dry out the skin.

How do I know if the serum has oxidized?

Fresh serum is pale; it darkens to yellow and then brown as the vitamin C degrades. Keep the bottle capped and out of direct light, and replace it once it turns deep orange or brown.

One 1 oz glass dropper bottle of the serum, new in box. No other items are included.

Is this the cheapest price for it?

The best new price was $12.42 at eBay as of November 5, 2026, with 8 stores listing it new. Check the price history before buying, since vitamin C serum prices move.

Where is the 20% Vitamin C + E Ferulic Acid Serum cheapest?

At eBay, for $12.42, 56% under what the other stores charge, as of our latest check.

What do buyers say about the 20% Vitamin C + E Ferulic Acid Serum?

Rated 4.8 out of 5 from 11,568 ratings. Buyers like: Soaks in immediately without feeling greasy; Seals in moisture on damp skin; Adds moisture to the skin. Common complaints: Consistency is very watery and diluted; Can dry out your face; use a small amount.

Where can I buy the 20% Vitamin C + E Ferulic Acid Serum?

9 stores we checked sell it, including eBay, Timeless Skin Care, Girona skincare, Walmart, Macy's.

20% Vitamin C + E Ferulic Acid Serum Price History: $12.42 at eBay

What reviewers say

4.8 / 511,568 ratings

Rated 4.8 out of 5 from 11,568 ratings, buyers mostly like how fast it absorbs and how it layers on damp skin. Complaints center on the watery texture, dryness when over-applied, and a cap that does not always seal.

What people mention

TextureMixedBuyers call it fast-absorbing and non-greasy, but some find it watery and diluted.
HydrationMixedIt adds moisture on damp skin, yet can dry out the face when too much is used.
PackagingCriticisedThe screw top on some bottles does not stay closed, so the bottle does not stay sealed.
ValuePraisedBuyers see a 20% vitamin C serum at this price as good value.
BrighteningPraisedUsers report it evens tone and brightens dull, discolored skin over time.

From eBay

Timeless Skin Care 20% Vitamin C + E Ferulic Acid Serum, 1 oz
New in box, unopened
Serum formulation for the face
Made in the United States

Sizes: 1 oz
Returns: 14 days returns; buyer pays return shipping, and an eBay shipping label cost is deducted from the refund.
Shipping: USPS Ground Advantage; ships from Pinellas Park, Florida, United States.
Packs: 10% off 2, 15% off 3, 25% off 4 or more items
In the box: Timeless Skin Care 20% Vitamin C + E Ferulic Serum, 1 oz, new in box

About the 20% Vitamin C + E Ferulic Acid Serum

The Brightener - Give your skin a megadose of L-ascorbic acid - 20% concentration with Ferulic Acid and Vitamin E. Our 20% Vitamin C + E Ferulic Acid serum brightens skin, helps support and build collagen, and evens out tone. Enhanced with Vitamin E & Ferulic Acid, this serum is a great pick me up for dull, discolored, and stressed skin, while providing 24/7 protection against environmental pollutants.

Recommended for : All skin types

Targets: Dullness, Hyperpigmentation, Discoloration

All sizes now come in premium glass bottles.