Parakeet Molting

I think my parakeet is molting because he is losing more feathers than usual and his feathers also look a little scruffy. I have 2 questions: I was wondering if there are any special kinds of fruits or vegetables that can strengthen his feathers and make them prettier while they are growing in. Second, when parakeets feathers are coming in, is it itchy? My parakeet will rub his face against the bars of the cage and scratch his head with his feet a lot. Thank you!!