Question 1

What makes CosIQ 20% EAA Serum special?

Accepted Answer

Its 20% ethylated ascorbic acid offers superior brightening and stability vs traditional vitamin C, without irritation.

Question 2

Can I use this with AHAs/BHAs?

Accepted Answer

Yes, but space them out (e.g., acids at night, this serum in AM) to avoid sensitivity.

Question 3

How fast will I see results?

Accepted Answer

Initial brightening in 2-4 weeks; significant spot reduction in 6-8 weeks with consistent use.

Question 4

Is 20% strength too strong for beginners?

Accepted Answer

No, this gentle form is ideal for all skin types. Start with alternate-day use if concerned.

Question 5

Why choose this over regular vitamin C?

Accepted Answer

It won't oxidize quickly, works at neutral pH, and penetrates deeper without stinging.

Question 6

Can I use this under makeup?

Accepted Answer

Yes, its lightweight texture layers perfectly under SPF/makeup.

Question 7

Should I store this in the fridge?

Accepted Answer

Not required, but keep away from direct sunlight to maintain potency.

Question 8

Is this safe for acne-prone skin?

Accepted Answer

Yes, it helps reduce post-acne marks without clogging pores.

Question 9

What if I experience mild tingling?

Accepted Answer

Normal with active penetration. Reduce to every other day if persistent.

Question 10

Can I use this with retinol?

Accepted Answer

Yes! Use this in AM and retinol in PM for comprehensive anti-aging benefits.

CosIQ Vitamin CEF-20% Ethylated Ascorbic Acid Glow Face Serum