What is Olay Vitamin C Regenerist Day Cream? Brighten up your skin with Olay Vitamin C SPF30 moisturiser! Our hydra glow day moisturiser with SPF 30 delivers transformative skin results instantly and overtime. It is crafted with Vitamin C, a proven antioxidant known to combat freeradical damage and 99% pure Niacinamide, that penetrates up to 10 layers deep to help activate surface cell renewal. Experience the power of 24-hour hydration, keeping your skin moisturised throughout the day. In just one day, skin is visibly healthy and glowing. Over 14 days, experience a visibly more even skin tone and texture.