Is 4% niacinamide strong enough to fade dark spots?

It is a moderate, well-studied dose that suits daily use. Expect gradual improvement in tone over weeks, not fast fading of deep pigmentation.

Does the vitamin C in this serum do anything?

The 3-o-ethyl ascorbic acid is listed at only 10 ppm, which is far below typical effective levels. Treat niacinamide and arbutin as the main actives.

Can I use it with retinol or acids?

Yes, niacinamide and arbutin layer well with retinol and most acids. Introduce it slowly if your skin is reactive, and patch test first.

How does it compare with a straight vitamin C serum?

It is gentler and more barrier-focused, with weaker antioxidant brightening. A dedicated 10–20% vitamin C serum will do more for glow but irritates more often.

One 30 ml bottle of serum. No applicator or extra items are included.

K-beauty serums like this usually drop during store-wide sales and holiday events. No current price was available to judge whether now is a low point.

Eqqualberry Vitamin Illuminating Serum

Last price we saw

$22.99at Amazon, last seen Nov 2

Prices change often: ask the agent below to check today's price at every store.

Prices are checked against each store and labelled with when.

Ask our shopping agent

Our take on the Eqqualberry Vitamin Illuminating Serum

The Eqqualberry Vitamin Illuminating Serum is a 30 ml brightening serum built on 40% acerola water (400,000 ppm) plus 4% niacinamide, 2% arbutin and a small amount of 3-o-ethyl ascorbic acid. It also carries panthenol, tocopherol, five ceramides and eight forms of hyaluronic acid, so it aims at tone and glow while keeping the barrier supported. The vitamin C derivative is only 10 ppm, so most of the brightening work falls to niacinamide and arbutin rather than vitamin C. No current price was available to compare against its recent range.

Best forShoppers wanting niacinamide and arbutin brightening without strong vitamin CDull or uneven tone with a compromised barrier