Person: I heard mayonnaise is really good for your hair.
Me: Yes, because mayonnaise contains oil and whole egg which has protein in it. Of course you could cut out the middle man and eliminate the extra ingredients such as vinegar, lemon juice, spices and additives like emulsifier and simply try adding protein and oil to your hair. Most conditioners containing protein are called something with “reconstructing” but you can also simply add an egg yolk to your regular conditioner. Of course there are oils that penetrates the hair strands better than olive oil, such as coconut or camellia oil.
Person: *Blank stare* …But oil is really bad for your hair!