I mix in high protein chick starter for extra vitamins and protein in the winter months. Once a month everyone gets an overnight dose of poultry cell diluted in their water. The problem with poultry vitamin supplements is that they are highly concentrated and too much of a good thing can be a very bad thing especially with vitamins. They can be given daily over short periods of time, but I would err strongly on the side of caution doing daily or even weekly doses long term. The side effects of a long-term vitamin overdoses can cause serious health complications such as vomiting, weakness, bone problems and even organ damage.