Ultimate Nourishing Rice Overnight Spa Mask — Reddit Reviews
by COSRX
Updated September 26, 2026
Niacinamide-rich sleeping mask for dehydration and overnight glow; can feel heavy.
What the community says
A leave-on rice sleeping mask with niacinamide, sunflower seed oil, glycerin, dimethicone, and allantoin. Redditors keep using it for dry, dehydrated, or post-retinoid skin, but it can feel greasy or cloggy if you overdo it.
What this means for you
What people love
Watch out for
Product details
Skin Type
Product Traits
Key Ingredients
What the science says
Acne
Some evidence
Niacinamide: 6 studies tested it on its own. See all 17 studies
What the studies found
- Most studies found niacinamide helped acne
- Some studies found 4% niacinamide cleared acne about as well as clindamycin
- One study found 4% niacinamide improved red, sore spots, but IPL worked better
- Some research found no clear difference, and a large review said the effects were uncertain
Hyperpigmentation
Some evidence
Niacinamide: 5 studies tested it on its own. See all 24 studies
What the studies found
- All of these studies found niacinamide helped fade dark spots or patches
- In clinical trials, 5% niacinamide faded dark spots more than a placebo
- It also helped when used with salicylic acid peels, more than peels alone
- Used on its own, it helped, but one study found a niacinamide mix worked better
- One study found the fading effect reversed after stopping niacinamide
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 41 mentions across 28 threads
COSRX Ultimate Nourishing Rice Overnight Spa Mask on Reddit, in one place — 28 threads from r/AsianBeauty, r/koreanskincare and 2 more, summarized.
“along side 2 Cosrx sleeping masks that I don’t love as much”
Mentioned
“2 Cosrx sleeping masks that I don’t love as much”
Mentioned
“Cosrx sleeping masks”
Mentioned
“Now when I need a little extra moisture I use the ultimate nourishing overnight rice mask from Cosrx.”
Positive
“focused on moisture/hydration instead until healed”
Positive
“when I need a little extra moisture”
Positive
“Cosrx ultimate nourishing rice overnight spa mask”
Positive
“plus either the Purito 5 ceramide moisturizer or Cosrx ultimate nourishing rice overnight spa mask.”
Positive
“Night time I use ...”
Positive
“moisturisers my skin love include the cosrx ultimate nourishing rice overnight spa mask and the illyoon ato cream!”
Mentioned
“same for me! It broke me out :( but I ended up using the rest as a hand cream for which it is PERFECT. for context, moisturisers my skin love include the cosrx ultimate nourishing rice overnight spa mask”
Mentioned
“Cosrx rice overnight mask i just cannot replace it. Its so good.”
Positive
“Cosrx has a moisturizer/ overnight mask with rice in it, may be a bit cheaper.”
Mentioned
“Cosrx has a moisturizer/ overnight mask with rice in it”
Mentioned
“may be a bit cheaper”
Mentioned
