Retinol 2.5% & Vitamin C Facial Serum – Brighten Dark Spots

Reveal a visibly brighter, more even-toned complexion with the TRSTAY Retinol 2.5% Vitamin C & A Facial Serum. This powerhouse essence combines a high-concentration retinol formula with the luminosity-boosting benefits of Vitamin C to help visibly diminish the appearance of dark spots, uneven tone, and fine lines — leaving your skin looking refreshed and radiant.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Why You'll Love It

• Retinol 2.5% – A high-potency retinol concentration that supports skin cell renewal for a smoother, more youthful-looking surface.
• Vitamin C & A Complex – Works to visibly brighten the complexion, fade the look of dark spots, and promote a more even skin tone.
• Collagen-Supporting Formula – Helps boost the skin's natural firmness and elasticity for a plumper, more supple appearance over time.
• Whole Face Application – Lightweight, fast-absorbing serum texture suitable for use across the entire face.
• Unisex – Formulated for all skin types and genders.

How to Use

1. Cleanse and gently pat your face dry.
2. Apply a small amount of serum to your fingertips and smooth evenly across the face.
3. Follow with your favourite moisturiser.
4. For best results, use as part of your daily skincare routine. If using during the day, finish with SPF.

Product Details

• Brand: TRSTAY
• Suitable For: All skin types – Unisex
• Application Area: Whole Face
• Pieces: 1 Unit
• Made in: Mainland China

Complete Your Skincare Routine

Pair this serum with other targeted skincare essentials from our collection:

• 0.5mm Mini Pocket Gel Pen – Quick Dry & Waterproof

For more information on retinol and skin health, visit the National Center for Biotechnology Information (NCBI) – Retinoids in Dermatology.

Learn more: South Korean beauty standards

Frequently Asked Questions

Q: What does the Retinol 2.5% Vitamin C Facial Serum do for my skin?

A: This facial serum is formulated to visibly brighten the complexion, reduce the appearance of dark spots and uneven skin tone, and support a smoother, more youthful-looking surface. The combination of retinol 2.5%, Vitamin C, and Vitamin A works together with a collagen-supporting formula to promote skin firmness and radiance with regular use.

Q: Is this serum suitable for sensitive skin?

A: This serum is formulated for unisex, whole-face use and is designed for a wide range of skin types. However, as retinol can be potent, we recommend starting with a patch test and introducing it gradually into your routine — especially if you have sensitive skin. Always follow up with a broad-spectrum SPF during daytime use.

Q: How long before I see visible results from using this facial serum?

A: Visible improvements in skin brightness and tone can vary from person to person. Most users begin to notice a more radiant and even complexion within 4–8 weeks of consistent daily use. For best results, use regularly as part of a complete skincare routine.

Q: Can I use this serum with my existing moisturiser or sunscreen?

A: Yes! This lightweight serum is designed to layer seamlessly under your moisturiser. If applying during the day, always finish with a broad-spectrum sunscreen, as Vitamin C and retinol can increase skin sensitivity to UV exposure.