Lions generally do not consume other carnivores, therefore it gets as much Vitamin A as it needs from its prey in the form of offal.
Which vitamin? The disease present would vary based on what vitamin is in the diet, so you'll have to be more specific.
My Mum supplements her diet with vitamin pills.
they do need it in their diet.
Vitamin A is essential for breeding stallions.
magnesium, vitamin A, and Vitamin D
In humans, vitamin c.
Depends on their diet.
Try testing your vitamin D &B12 levels
Vitamin A, Vitamin D..protein, not too much cholesterol
Beriberi is caused by lack of vitamin B1 in the diet
block vitamin D out of your diet
Vitamin D