Vitamin C is a powerful ingredient in many anti-aging products. Some studies show that it can reduce the appearance of wrinkles when you use it for at least 12 weeks. A healthy diet that’s high in this nutrient might help, too. Research suggests that people who eat more vitamin C have fewer wrinkles. It’s not limited to citrus fruits. Broccoli, red peppers, and spinach are chock full of it, too.