Question 1

How does 8% compare to higher concentrations?

Accepted Answer

Gentler for sensitive skin while still effective for brightening.

Question 2

Can I use this with niacinamide?

Accepted Answer

Yes, they work well together - apply vitamin C first.

Question 3

Is this better than L-ascorbic acid?

Accepted Answer

More stable and less irritating with similar benefits.

Question 4

When will I see results?

Accepted Answer

Glow in 1-2 weeks, pigmentation improvement in 4-6 weeks.

Question 5

Should I refrigerate this?

Accepted Answer

Not required due to stability, but avoid heat exposure.

Question 6

Can I use it twice daily?

Accepted Answer

Start with AM only, then add PM if tolerated.

Question 7

Is this fragrance-free?

Accepted Answer

Yes, no added fragrance or essential oils.

Question 8

Why choose ethylated vitamin C?

Accepted Answer

Penetrates deeply without acidic irritation.

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).

CosiQ Vitamin C-8% Ethylated Ascorbic Acid Face Serum