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Retinol Boosting Serum | Intensive Firming, Hydration & Plumping Care with Retinol, Peptides & Vitamins | Pore-Refining, Smooth Radiant Skin | Korean Skincare, 1.01 fl. oz
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Retinol Boosting Serum | Intensive Firming, Hydration & Plumping Care with Retinol, Peptides & Vitamins | Pore-Refining, Smooth Radiant Skin | Korean Skincare, 1.01 fl. oz

4.7 / 5 ★★★★★ 833 ratings
10K+ bought #46 in Facial Serums Amazon, 2026-08-01
Quick verdict

A excellent, 4.7-star serum built around retinol. Best for congestion.

$18.90

Amazon price on 2026-08-02 · In Stock. Prices change often, check Amazon for today's price.

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Overview

The hero ingredient is retinol, and you use it as a targeted treatment step. With an excellent 4.7 out of 5 from over 833 ratings, it is one of the best-reviewed serums & toners in the range. It uses active ingredients, so patch test first and introduce it slowly if your skin is reactive.

Pros

  • Well-rated at 4.7/5 across 833 reviews
  • Built around retinol, a genuinely on-trend active

Cons

  • Contains actives that can irritate reactive skin, so patch test first
  • Priced above the cheapest options in the range
  • As a food-and-cosmetic product, results vary from person to person

At a glance

TypeSerums & Toners
Key ingredientretinol
Formatserum
Size1.01 fl. oz
Routine stepTreatment (serum step)
Best for skin typeOily, Dry, Combination, Normal
Sensitive-skin friendlyUse with care, contains actives
Rating4.7 / 5 from 833 ratings

What buyers actually say

We read a sample of the Amazon reviews for this product and describe the pattern in our own words. It is a sample, not a survey of all 833 ratings, and we do not reproduce customer reviews.

Tolerability is the through-line here. The recurring praise is that this behaves like a retinol without the usual cost of entry, with reviewers who describe sensitive skin or no prior retinol experience reporting brighter, smoother skin and no peeling. Several mention that a small pump goes a long way and that it absorbs without leaving a film. The practical warnings come from the positive reviews themselves: introduce it slowly, avoid pairing it with peels on the same day, and wear sunscreen. The main gripe is bottle size for the price, and one four-star reviewer found only a slight change in fine lines.

Praised for

  • Gentle enough for daily use, including for sensitive skin and retinol beginners
  • Brighter, smoother-looking skin and fading of dark spots with consistent use
  • Small pump goes far; absorbs without a greasy film
  • Priced well against other retinols reviewers have tried

Criticised for

  • Bottle feels small for the price, per a repeat buyer
  • Needs slow introduction, daytime sunscreen, and care about pairing with peels
  • One four-star reviewer saw only a slight blurring of fine lines and no clear edge over other retinols

How the ratings break down

Amazon's own star distribution for this product, read on 2026-08-02. We show the one-star share too, because an average alone hides it.

5 star 83%
4 star 10%
3 star 4%
2 star 1%
1 star 2%

What is retinol?

Retinol is a vitamin A derivative that targets fine lines, texture and firmness over time. It can irritate at first, so introduce it slowly and use sunscreen by day.

Key features

Frequently asked questions

Is the medicube Retinol Boosting Serum | Intensive Firming good for sensitive skin?

It contains active ingredients, so it can be too much for very reactive skin. Patch test first, introduce it slowly, and skip it if your barrier is compromised.

How do you use the medicube Retinol Boosting Serum | Intensive Firming?

Use it after toner, before moisturizer. Follow the directions on the pack, and always finish your morning routine with sunscreen.

Is the medicube Retinol Boosting Serum | Intensive Firming worth it?

For the price, it is an easy recommendation: 4.7 out of 5 from a large number of shoppers, doing a clear job in the routine. Results vary from person to person, so manage expectations.

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Not sure yet?

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