Question 1

How is this different from L-ascorbic acid?

Accepted Answer

Ethylated form is more stable and less irritating while equally effective.

Question 2

Can sensitive skin use this?

Accepted Answer

Yes, the ethylated form is gentler than traditional vitamin C.

Question 3

Should I refrigerate this?

Accepted Answer

Not required due to its stability, but avoid heat/sunlight.

Question 4

When will I see results?

Accepted Answer

Glow immediately, pigmentation fades in 4-6 weeks.

Question 5

Can I use this with niacinamide?

Accepted Answer

Yes, they work synergistically - apply vitamin C first.

Question 6

Is this fragrance-free?

Accepted Answer

Yes, no added fragrance or essential oils.

Question 7

Why 23% concentration?

Accepted Answer

Optimal efficacy without compromising stability or tolerance.

Question 8

Can I use it twice daily?

Accepted Answer

AM is ideal, but PM is safe if tolerated.

Question 9

Is this cruelty-free?

Accepted Answer

Yes, never tested on animals.

Question 10

How long does one bottle last?

Accepted Answer

2-3 months with daily use (3-4 drops per application).

CosIQ Vitamin C-23% Ethylated Ascorbic Acid Face Serum