Yes, vitamin C is an excellent ingredient for day cream. It's a potent antioxidant that can help protect skin from environmental damage like pollution and UV rays, while also brightening the complexion and promoting collagen production.

The 'best' vitamin C cream is subjective and depends on individual skin type and concerns. Look for formulations with stable forms of vitamin C (like L-Ascorbic Acid or Tetrahexyldecyl Ascorbate) and consider factors like concentration, added ingredients, and reviews from users with similar skin.

Vitamin C cream is highly beneficial for older skin. It can help reduce the appearance of wrinkles, age spots, and hyperpigmentation by boosting collagen synthesis and evening out skin tone, leading to a more youthful appearance.

Daily application of vitamin C can lead to brighter, more even-toned skin with improved texture and reduced signs of aging. Some individuals may experience mild irritation, so start with a lower concentration and gradually increase frequency if needed.