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Aqua Marine Deep Serum

Serum

Aqua Marine Deep Serum — Reddit Reviews

by Dr. Althea

Not enough verdicts yetSee the Reddit discussion

Updated October 13, 2026

Watery hydrating serum for tretinoin routines; helps prevent peeling and dryness.

What the community says

Backed by 57 studies

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.

From Reddit

Backed by 2 threads from r/tretinoin and r/Rosacea.

Read the threads ↓

What people love

  • Works in tretinoin sandwich routines
  • Easy toner-to-serum-to-moisturizer layering
  • Hydration step for extremely dry, dehydrated skin

Product details

Product Traits

Key Ingredients

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

    What the studies found
    • Most studies found niacinamide helped acne
    • It often cleared acne about as well as clindamycin when put on the skin
    • Some studies found it helped reduce red, sore spots and pimples
    • Some evidence is still uncertain because some studies found no clear difference
  • 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

    What the studies found
    • The one study that tested it on its own found it helped the skin barrier
    • It lowered water loss through the skin
    • It increased the thickness of the outer skin layer

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

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