Here's how you can help your dry hair. ingredients Eggs are a nutrient-rich hair superfood. Vitamins A and E, biotin, and folate are just some of the nutrients found in eggs that are said to help keep hair thick and healthy. Avocado is a great source of biotin, and adding this B-complex vitamin back into the diet may help hair to grow more healthily. Mayonnaise, when used as a hair mask, adds shine and strengthens hair from root to tip. The main ingredients in mayonnaise are egg and oil. The hig