Vetsense Avi-Calcium is a liquid calcium supplement with added Vitamin D3, formulated for birds. It targets two life stages where calcium demand commonly exceeds what a standard seed or grain diet provides: active laying hens requiring calcium for eggshell formation, and growing birds building bone density.

The supplement uses a highly soluble liquid calcium form, which is more readily absorbed than insoluble mineral sources such as crushed shell or grit alone. Vitamin D3 is included because calcium absorption depends on it — supplementing calcium without adequate D3 typically yields poor uptake. The solution mixes directly into drinking water, requiring no special equipment or preparation beyond a standard water container.

Birds on seed-heavy diets are among the most commonly calcium-deficient pets, particularly during breeding season or periods of rapid growth. Avi-Calcium addresses that gap without disrupting the bird's existing diet or introducing a supplement format they're likely to avoid.