2024 NOTE: Contents of supplements may have changed: it is not necessary to use listed brands. The total amount of active ingredient is all that matters.
SPECIFICALLY "NOW DRY VITAMIN D" referred to vitamin D3 (cholecalciferol). NOW has changed this dry form of its supplement to a vegetarian form, vitamin D2, ergocalciferol. This is a plant-based form and it is not fully bioavailable to cats. PLEASE USE A DRY VITAMIN D3, it will read cholecalciferol as the active ingredient.
SPECIFICALLY "NOW DRY VITAMIN D" referred to vitamin D3 (cholecalciferol). NOW has changed this dry form of its supplement to a vegetarian form, vitamin D2, ergocalciferol. This is a plant-based form and it is not fully bioavailable to cats. PLEASE USE A DRY VITAMIN D3, it will read cholecalciferol as the active ingredient.