Apply vitamin C serum in the morning after cleansing and toning, on dry, clean skin.  Use 3–5 drops or a pea-sized amount, gently patting it onto your face and neck—avoid rubbing.  

Allow 1–3 minutes for full absorption before layering other products. 

Follow with moisturizer and always finish with broad-spectrum SPF 30+, as vitamin C enhances sun protection but does not replace sunscreen. 

For sensitive skin, start 2–3 times per week, gradually increasing to daily use.  Use a formulation with 5–10% vitamin C; normal to oily skin can tolerate up to 20%. 

Pair with hyaluronic acid, niacinamide, or ferulic acid for enhanced brightness and hydration. 

Avoid combining with benzoyl peroxide, retinol, or strong AHAs/BHAs in the same routine to prevent irritation or inactivation of ingredients.  

Patch test is essential.
If irritation occurs, cease use and consult a physician.
Use only as directed on unbroken skin.
For external use only.
Keep out of reach of children.
Store in a cool, dry place between 5–25°C.
Protect from direct sunlight.
Due to the natural ingredients in the serum, colour may vary over time.

Ishikawa et al. (2019)27 women with solar lentigos applied 6% vitamin C lotion twice daily for 24 weeks. Treated areas showed significantly higher lightening (ΔL, p < 0.001) and reduced melanin index in both lesions and surrounding skin. 

Kim et al. (2020)18 patients used a 20% vitamin C + vitamin E + ferulic acid serum twice daily for 2 weeks post-laser. Treated sides showed significant reduction in melanin index (p < 0.05) and improved global skin texture.

The following peer-reviewed publications relate to topical vitamin C and antioxidant-based cosmetic ingredient research:

1. Traikovich, S. S. “Use of topical ascorbic acid and its effects on photodamaged skin.” Dermatologic Surgery, 25(9), 1999.

2. Fitzpatrick, R. E., et al. “Topical 10% L-ascorbic acid and tetrahexyldecyl ascorbate: effects on collagen synthesis and photoaged skin.” Dermatologic Surgery, 28, 2002.

3. Humbert, P. G., et al. “Topical ascorbic acid on photoaged skin: clinical, topographical, and ultrastructural evaluation.” Experimental Dermatology, 12(3), 2003.

4. Perez, M., et al. “Comparative study of topical L-ascorbic acid and hydroquinone in melasma.” Journal of the American Academy of Dermatology, 51, 2004.

5. Huh, C. H., et al. “Clinical efficacy of iontophoresis-assisted vitamin C in melasma treatment.” Journal of Dermatological Treatment, 13, 2002.