Super concentrated vitamin supplement (10 times stronger than standard Soluvite D) – very cost effective. Contains all 12 essential vitamins required for a balanced diet in birds along with increased levels of vitamin D3 to support birds with insufficient access to natural sunlight. Vitamin D3 is a particularly important nutrient. Birds housed indoors may lack D3, which can lead to poor breeding success and chick growth, inadequate calcium absorption and many other problems.