
Aqua Marine Deep Serum — Reddit Reviews
by Dr. Althea
Updated October 13, 2026
Watery hydrating serum for tretinoin routines; helps prevent peeling and dryness.
What the community says
Redditors use a watery hydrating serum after toner and before moisturizer, including in tretinoin sandwich routines. People with extremely dry, dehydrated, sensitive skin report no peeling or dryness. Expect hydration, not quick transformation; dry skin may need cream over it.
What this means for you
What people love
Product details
Skin type data limited
Where to buy
What the science says
Acne
Some evidence
Niacinamide: 6 studies tested it on its own. See all 17 studies
Hyperpigmentation
Some evidence
Niacinamide: 5 studies tested it on its own. See all 20 studies
What the studies found
- All 5 studies that tested it on its own found it helped fade dark spots
- On its own, it reduced facial darkening and made skin look lighter than a placebo
- It also improved dark spots linked with sun damage in one clinical trial
- Used with other ingredients, it faded patches more than niacinamide alone or the other ingredient alone
- The side effects were similar and mild in the study that reported them
Anti-Aging
Some evidence
Niacinamide: 3 studies tested it on its own. See all 9 studies
What the studies found
- All 3 studies that tested it on its own found it helped with signs of aging
- Studies found it improved the look of wrinkles and made skin seem firmer
- Studies also found it helped dark spots and reduced redness and yellowing
- One study found it helped skin hold more water and lowered water loss through the skin
- Used with another ingredient, it improved dark spots, fine lines, wrinkles, and firmness more than niacinamide alone
Skin Barrier
Not proven yet
Few or mixed studies. This claim isn't established.
Niacinamide: 1 study tested it on its own. See all 17 studies
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 7 mentions across 2 threads
Dr. Althea Aqua Marine Deep Serum on Reddit, in one place — 2 threads from r/tretinoin and r/Rosacea, summarized.
“Then i go in with dr althea aqua marine deep serum”
Positive
“In the morning it’s just toner, serum, moisturizer and sunscreen.”
Positive
“most of the products didn’t show results till months later I’m on my 5th refill.”
Positive
“and Dr. cream. Althea Aqua”
Positive
“Dr. Althea Aqua”
Positive





