Retinal Serum
A dropper or pump leave-on that puts retinal in a fluid serum, worn at night before moisturizer rather than as a wash-off or cream-only treatment.
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![[KSECRET Official] SEOUL 1988 Retinal Serum Duo | Retinal Liposome 2% Serum (2EA) | Intensive Wrinkle Care, Pore Minimizing & Skin Renewal](https://p16-oec-general-useast5.ttcdn-us.com/tos-useast5-i-omjb5zjo8w-tx/503b26752be946e8a157126132d0e7a9~tplv-fhlh96nyum-resize-webp:600:600.webp?dr=12190&t=555f072d&ps=933b5bde&shp=8dbd94bf&shcp=a6e80448&idc=useast5&from=2378011839 "[KSECRET Official] SEOUL 1988 Retinal Serum Duo | Retinal Liposome 2% Serum (2EA) | Intensive Wrinkle Care, Pore Minimizing & Skin Renewal")
![[KSECRET Official] SEOUL 1988 Retinal Advanced Trio | Complete Retinal Routine with 2% Serum + 4% Eye Cream + 12% Shot | Intensive Wrinkle Care, Pore Minimizing & Skin Renewal](https://p16-oec-general-useast5.ttcdn-us.com/tos-useast5-i-omjb5zjo8w-tx/0a0fe519c3d94fddb95920e5ae8abedc~tplv-fhlh96nyum-resize-webp:600:600.webp?dr=12190&t=555f072d&ps=933b5bde&shp=8dbd94bf&shcp=a6e80448&idc=useast5&from=2378011839 "[KSECRET Official] SEOUL 1988 Retinal Advanced Trio | Complete Retinal Routine with 2% Serum + 4% Eye Cream + 12% Shot | Intensive Wrinkle Care, Pore Minimizing & Skin Renewal")
![[medicube] Retinol 1.9% Boosting Serum for Intensive Firming, Hydration, and Plumping Care | Smooth, Radiant, and Youthful-Looking Skin with 99.8% Pure Potent Formula | 30ml (1.01 fl.oz)](https://p16-oec-general-useast5.ttcdn-us.com/tos-useast5-i-omjb5zjo8w-tx/88e4ce1ae43d4e72b56c44783138a8fc~tplv-fhlh96nyum-resize-webp:600:600.webp?dr=12190&t=555f072d&ps=933b5bde&shp=8dbd94bf&shcp=a6e80448&idc=useast5&from=2378011839 "[medicube] Retinol 1.9% Boosting Serum for Intensive Firming, Hydration, and Plumping Care | Smooth, Radiant, and Youthful-Looking Skin with 99.8% Pure Potent Formula | 30ml (1.01 fl.oz)")
![[Purito Official] Retinol 0.1% + Retinal 0.1% Anti-Aging Facial Serum | for Wrinkles, Fine Lines & Firmer Skin | Dual Retinoids with NAD+, Improve Elasticity & Skin Texture | Korean Skincare](https://p16-oec-general-useast5.ttcdn-us.com/tos-useast5-i-omjb5zjo8w-tx/e43de2dc20a84ce49baa9fe1de0401b0~tplv-fhlh96nyum-resize-webp:600:600.webp?dr=12190&t=555f072d&ps=933b5bde&shp=8dbd94bf&shcp=a6e80448&idc=useast5&from=2378011839 "[Purito Official] Retinol 0.1% + Retinal 0.1% Anti-Aging Facial Serum | for Wrinkles, Fine Lines & Firmer Skin | Dual Retinoids with NAD+, Improve Elasticity & Skin Texture | Korean Skincare")
![[KSECRET Official] SEOUL 1988 Retinal Essential Set | Retinal Liposome 2% Serum (1EA) + Retinal Liposome 4% Eye Cream](https://p19-oec-general-useast5.ttcdn-us.com/tos-useast5-i-omjb5zjo8w-tx/27c514e3ba6c4e4686c91edd7b675896~tplv-fhlh96nyum-resize-webp:600:600.webp?dr=12190&t=555f072d&ps=933b5bde&shp=8dbd94bf&shcp=a6e80448&idc=useast5&from=2378011839 "[KSECRET Official] SEOUL 1988 Retinal Essential Set | Retinal Liposome 2% Serum (1EA) + Retinal Liposome 4% Eye Cream")
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Introduction
A retinal serum is the fluid, dropper-or-pump version of vitamin A—not a cleanser, not an eye cream, and not a retinol capsule. You spread a few drops on dry skin at night, wait, then seal with moisturizer so the serum does not sit sticky under sunscreen the next morning.
- Viscosity: watery essence versus silicone-smooth serum that pills under cream.
- Dispenser: metered pump versus open dropper that oxidizes faster once opened.
- Whether retinal is the hero or buried under oils, fragrance, and “brightening” extras you did not ask for.
If two serums list similar retinal percentages, choose the one that layers without pilling on your usual night cream. A serum that needs a separate moisturizer is normal; a serum that already feels like a lotion may be mislabeled cream.