Your morning serum is a shield. Your night serum is a repair crew. Using the same one for both is like wearing sunscreen to bed.
Vitamin C is unstable—it degrades in sunlight. But applied in the AM, it becomes your best defense against pollution and blue light. At night, your skin is primed for repair, not defense.
This is the C.E.O. 15% Vitamin C Brightening Serum from Sunday Riley. It’s $85. I tried it because “vitamin C + THD” is the gold standard for stability.
THD Ascorbate
This is the fat-soluble, super-stable form of vitamin C—doesn’t oxidize in the bottle.
Squalane Base
It’s an oil serum, which is unusual. Absorbs in 30 seconds, no sticky residue.
Pump Packaging
Airless pump keeps it fresh. You’ll use every last drop.
Photo: ibnu ihza / Unsplash
It’s not just a C serum. It’s a brightening cocktail with turmeric and bisabolol. The THD ascorbate is the star—it penetrates deeper than L-ascorbic acid.
- THD Ascorbate (15%): Fat-soluble vitamin C that actually sinks in
- Turmeric Extract: Calms redness while it brightens—a two-for-one
- Bisabolol: Soothes irritation from the actives
- Squalane: Hydrates without clogging pores
Photo: Poko Skincare / Unsplash
It feels like a dry oil—slippery for a second, then gone. No citrus smell, just a faint, earthy scent from the turmeric. Doesn’t pill under sunscreen.
By week two, my foundation sat differently. More even, less need for concealer. The surprise? It calmed my random chin redness.
My skin looks more even, less ruddy. Old acne marks faded faster. Did it make me “glow from within”? Not really. It made my skin look healthier, not shinier.
This is the AM defender you commit to. It works quietly but consistently. You won’t see a dramatic change overnight—you’ll just notice one day that your skin looks reliably good.