BELVIT-D3 is a unique combination of feed supplement with Vitamin K2-7, which improve the efficiency of Vitamin D3 metabolism and so helps to improve bone strength as well as egg shell quality. Belvit-D3 is 1,25-dihydroxy vitamin D, a metabolite of vitamin D3. When birds face enteric diseases and stress, birds are often unable to absorb and convert enough vitamin D3. Belvit- D3 is adsorbed in the intesne more effecvely than Vitamin D3 means its first metabolic step is by-passed.