Vitamin C

What is Vitamin C in skincare?

Vitamin C is a powerful antioxidant and one of the most clinically validated brightening actives in skincare. Within RATIONALE, Vitamin C is delivered through Multi-Vitamin Complexes, and is the cornerstone of The Brightening Collection, formulated to neutralise free radicals and visibly brighten the complexion across a morning skincare ritual. 

What does Vitamin C do for skin?

Vitamin C neutralises free radicals generated by solar and environmental damage, slows excess melanin production, supports collagen integrity, and brightens the appearance of pigmentation. With consistent use, Vitamin C helps reveal a more luminous, even, and resilient-looking complexion. It is especially valuable in addressing dullness, uneven tone, and the visible signs of solar exposure. 

Which RATIONALE formulations contain Vitamin C?

Vitamin C is the foundation of The Brightening Collection. Key formulations include #2 The Brightening Serum (resilient skin), #2 The Brightening Hydragel (all skin), #2 The Brightening Light Crème (combination skin), and #2 The Mask (combination skin). Each pairs Vitamin C with a Multi-Vitamin Complex tailored to specific skin types. 

Can Vitamin C help with pigmentation?Yes. Vitamin C is one of the most effective topical actives for addressing the appearance of pigmentation. It works to slow excess melanin production and brighten existing pigmentation. For visible improvement, pair Brightening formulations with daily SPF and refining actives in the evening. Consistent use over four to twelve weeks delivers the most pronounced improvement in clarity and tone. 

Is Vitamin C suitable for sensitive skin?

Yes, when introduced thoughtfully. RATIONALE Vitamin C formulations are paired with skin-comforting actives to support tolerance across skin types. Sensitive skin types are encouraged to begin with lighter formulations such as #2 The Brightening Light Crème and to introduce gradually. Our Client Services Team or a RATIONALE Skin Therapist can recommend the formulation best suited to your skin. 

Can I use Vitamin C with niacinamide or retinol?

Yes. Vitamin C and niacinamide layer effectively in a daytime ritual together they offer antioxidant defence and barrier support. Vitamin C in the morning and retinol in the evening is a complementary pairing, with each active working at its optimal time. RATIONALE formulations are created to work in synergy across your full daily Ritual. 

When should I apply Vitamin C?

Vitamin C is most effective in the morning, applied after your Strengthening step and before your Brilliance formulations. Used in the morning, it provides antioxidant defence throughout the day and supports the visible brightening benefits of consistent SPF use. Daily application delivers cumulative results over weeks and months.