How is this different from a pure L-ascorbic acid serum?

It uses 3-glyceryl ascorbate, a vitamin C derivative, which is gentler and more stable but works more slowly. Pure L-ascorbic acid serums at 10–20% act faster but sting more and oxidize sooner.

Can I use it with retinol or niacinamide?

Yes. The derivative form makes it easier to layer with retinol than strong pure vitamin C. Niacinamide pairs fine, though some people space them out if skin feels tingly.

Is the orange scent from fragrance?

The scent comes from orange oil in the ingredient list, not a synthetic fragrance. People with very reactive skin should patch test first.

How should I store it?

Keep it cool and out of direct sun, and use it within 12 months of opening. The derivative is more stable than pure vitamin C but still degrades over time.