Frequently Asked Questions Which vitamins can be acquired outside of an animal’s diet? Vitamin D is acquired outside of an animal’s diet through exposure to sunlight. Learn more about obtaining vitamin D from sunlight. How can calcium be obtained by an animal without consuming it? Calcium can be obtained by an animal through the ingestion of calcium-rich stones or shells. Learn more about calcium sources for animals. What is the source of vitamin C for animals? Animals can obtain vitamin C from their body’s natural synthesis. Unlike humans, most animals can produce their own vitamin C. Learn more about animals…