Leafy Greens: Spinach and kale are loaded with iron, which helps keep hair strong and prevents breakage. Spinach and kale are loaded with iron, which helps keep hair strong and prevents breakage. Berries: Bursting with antioxidants and vitamin C, which boosts collagen production for stronger hair. Bursting with antioxidants and vitamin C, which boosts collagen production for stronger hair. Nuts & Seeds: Almonds, sunflower seeds, and walnuts are full of vitamin E, helping protect your hair from stress and environmental damage.