Question: what are the most essential vitamins?
Answer: VITAMIN A. GOOD FOR: Healthy eyes and general growth and development, including healthy teeth and skin. ... 
B VITAMINS. GOOD FOR: Energy production, immune function and iron absorption. ... 
VITAMIN C. ... 
VITAMIN D. ... 
VITAMIN E. ... 
VITAMIN K. ... 
FOLIC ACID. ... 
CALCIUM.