I have been using Amino Acid Miracle for years and think it is the best bird vitamin out there as it contains high levels of essential amino acids plus vitamins. Available from ABBA. ADD one tablespoon to 4 cups dry nestling food. Can be added to egg food but I use a tablespoon to the large yellow tupperware bowl as it also has hard boiled eggs in it.
ABBA Fertility E is also very good and convenient. If you are having fertility problems, it takes about three weeks to turn it around and get excellent results.