Timeless 20% Vitamin C + E Ferulic Acid Serum
Updated Nov 8, 2026 · Top Vitamin C Serum for face
Best for People who want 20 percent L-ascorbic acid and will finish the bottle while it is still pale.
A 20 percent L-ascorbic acid serum with vitamin E and ferulic acid, the same trio as the expensive SkinCeuticals formula. Chemist Confessions heated five ascorbic-acid serums for three weeks. Timeless started nearly clear and yellowed faster than some of the others, and the plastic pump sputtered. They still passed it, and they said to buy the glass airless pump from the brand, not the older plastic pump that was still on Amazon. Ascorbic acid dies in light and air and turns brown. If the serum arrives dark, send it back. Keep it cool and use it up. It stings on a broken barrier. It is not a moisturizer.
What customers like
- Contains 20% Vitamin C which is effective for brightening and evening skin tone.
- Includes Vitamin E and ferulic acid enhancing the effectiveness and stability of Vitamin C.
- Nongreasy formula that moisturizes without feeling heavy.
- Suitable for all skin types including sensitive skin.
- Affordable compared to other products with similar ingredients.
- Packaging protects from light exposure maintaining product effectiveness.
- Dispenser pump is more convenient and hygienic than dropper bottles.
What customers dislike
- Some users report an unpleasant smell in recent batches.
- Price has been increasing which may deter future purchases.
- Very liquid consistency which requires careful handling to avoid spills.
- Dose
- 20 percent L-ascorbic acid
- Also
- Vitamin E, ferulic acid
- Size
- 1.7 fl oz
- Stability
- Use while pale; plastic pump yellowed faster in a heat test
- pH
- Needs to be under about 3.5 to work
Sources: Chemist Confessions: three-week heat test of Timeless 20 percent · Timeless listing: 20 percent vitamin C, E, and ferulic acid
