# COSRX COS-050 Retinol 0.5% Facial Oil Serum with 91% Squalane

Target fine lines in your nighttime routine with COSRX Retinol 0.5 Oil, featuring 91% squalane.

- [Original product page](https://www.ofertitastop.com/us/product/cosrx-cos-050-retinol-facial-oil)
- [View offer](https://www.ofertitastop.com/us/visit/cosrx-cos-050-retinol-facial-oil)
- Market: US
- Language: en-US
- Currency: USD
- Product updated: 2026-11-02T23:57:42.242Z
- Brand: COSRX
- Model: COS-050
- SKU: ofertitastop-us-176123
- Category: Health & Beauty > Personal Care > Cosmetics > Skin Care > Lotion & Moisturizer
- Source store: amazon US
- Active deal: Yes
- Price: 21.50 USD
- Previous price: 27.00 USD
- Discount: 20%
- Rating: 4.5 / 5
- Reviews: 3235

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## Description

For a nighttime skin care routine focused on fine lines and firmness, COSRX Retinol 0.5 Oil combines a retinol treatment with a nourishing oil format. Its 0.5% retinol helps target visible signs of aging, while 91% squalane helps protect the skin barrier.

Want a retinol step that also brings barrier-supporting ingredients into your routine? The formula pairs retinol with squalane and tocotrienol, a form of vitamin E, in one facial oil.

Apply 1–2 drops as the last step of your nighttime routine. Start gradually, following the product’s recommended schedule, and patch test before applying it to your face.

## How to use it

Use the oil at night as the final step in your skin care routine. For the first two weeks, the recommended frequency is three times per week. After the third week, use it every other day. Begin with a patch test on the body and proceed with facial use only if irritation does not persist.

If you use the product during the day, follow with SPF 30+ sunscreen to help protect skin from photosensitivity. This guidance makes the oil easy to place in a routine: reserve it for the final nighttime step, or pair daytime use with sun protection.

## Strengths

Retinol is the active ingredient for addressing the appearance of fine lines and wrinkles and supporting firmer-looking skin. The formula’s 91% squalane helps protect the skin barrier, while tocotrienol adds a vitamin E ingredient associated with skin care for signs of aging. Together, these ingredients make the product a focused option for someone choosing between a retinol-only treatment and a facial oil that also includes a retinol active.

The oil format fits naturally into a routine that already has a defined final step. Rather than adding separate retinol and facial oil products, you can apply this as one last-step treatment. Buyers describe the serum as moisturizing and often mention softer, smoother-feeling skin and a brighter-looking complexion. Feedback on consistency is mixed: some find it comfortable without a heavy feel, while others describe it as quite oily. Fragrance impressions also vary.

## Tech specs

- Name: COSRX Retinol 0.5 Oil
- Type: Retinol facial oil serum
- Retinol concentration: 0.5%
- Squalane: 91%
- Size: 0.67 fl oz
- Key ingredients: Retinol, squalane, tocotrienol (vitamin E)
- Reference: COS-050

## Before you decide

**How often should I use the oil at first?** For the first two weeks, use it three times per week at night. After the third week, the recommended schedule is every other day.

**Can I apply it in the morning?** If you use it during the day, follow with SPF 30+ sunscreen to protect your skin against photosensitivity.

**Should I patch test before facial use?** Yes. Apply a patch test on the body first, and proceed with facial use only if irritation does not persist.

## Final verdict

COSRX Retinol 0.5 Oil is suited to routines that prioritize care for fine lines and firmer-looking skin while incorporating an oil-based final step. Its combination of 0.5% retinol, 91% squalane, and tocotrienol gives shoppers a clear reason to choose it over a basic facial oil: it pairs barrier-supporting squalane with a retinol treatment in the same nighttime product.

## Images

![COSRX COS-050 Retinol 0.5% Facial Oil Serum with 91% Squalane — 1](https://www.ofertitastop.com/i/fhSXQFKd49lGhCDRi4R_jC3I00DqGKN5i1SKA4UFqzafdxN0GC6qkbGlUH754FSSYC5TylwK4lorgL5-yvF0MyPAicTVZh4CKYrQyIf8JI6NC-me-87IVQ.jpg)

![COSRX COS-050 Retinol 0.5% Facial Oil Serum with 91% Squalane — 2](https://www.ofertitastop.com/i/lJaNmK0GzDqctz9HfZboxsyMUr6LGRQA-9MurM89enjn0wyB38XLFgzawkBVs9Bx-79dGIuFIGmldfFNm0poTZPYeIuf9p9URBIMBWWRlnSHPY8P0Xc6ZA.jpg)

![COSRX COS-050 Retinol 0.5% Facial Oil Serum with 91% Squalane — 3](https://www.ofertitastop.com/i/INcwYJFaj9Zn54Juyn99JX9Qgob69rfCsEto7f4L8tzmM8y39rmtIhP28pwlrASPv3eYQYUTZUYZRKY5NUHYzk8AnjEWXJwS-6a8Xt-ipiXI0z5YEo4oFw.jpg)

![COSRX COS-050 Retinol 0.5% Facial Oil Serum with 91% Squalane — 4](https://www.ofertitastop.com/i/0aSFZrsknyT3sQDaoCcOOLDyVEoQXuNTOrAqfehRETzxPlCl0HDQVdNDyGPJ6obU1Jj07rD7mA0xLSsrAg7CZvPAQiDdb-K_AhE1Ywez7Q-BwGEvGqhKmw.jpg)

![COSRX COS-050 Retinol 0.5% Facial Oil Serum with 91% Squalane — 5](https://www.ofertitastop.com/i/03tkMxFhIJwz4zlpQZ-F3OcivEAHQ2yd1zxbbkRkg4lstodRvkiNSnG8-Nub1o9wZ-0Zno7N9NqNVqGo3FtPeT3Te-rE0FBp88YZcK6wSIQoHdd53ymXFg.jpg)