8. Vitamin E
This fat-soluble vitamin is important for vision, immune function, and the formation of blood vessels. It is also an antioxidant that protects your cells against damage by free radicals. The Mayo Clinic cautions that most people are able to get the required amount of vitamin E from their diet. Furthermore, too much vitamin E can have negative side effects. However, if your doctor recommends taking a vitamin E supplement, your body will best absorb it when it is taken with food. Natural food sources of vitamin E include green vegetables, nuts, seeds, and vegetable oils.
7. Vitamin K
It is rare to have a deficiency in vitamin K. Those at risk for a deficiency in this vitamin are people who are unable to absorb fat. This includes people with conditions such as cystic fibrosis, celiac disease, ulcerative colitis, and short bowel syndrome, according to the National Institutes of Health. Vitamin K is found in green vegetables such as broccoli, kale, spinach, and collards. To absorb more of this vitamin, consume these vegetables along with fatty foods such as salmon, nuts, avocado, or olive oil.
Your doctor may recommend supplementation with calcium, as American diets are often low in this important mineral. Calcium is critical for the formation of healthy teeth and bone tissues. It is also important for blood clotting, blood vessels, hormone secretion, and healthy nervous system function. There are two types of calcium supplements available. Katherine Zeratsky of the Mayo Clinic recommends taking calcium carbonate with food for better absorption. You can take calcium citrate either with or without food. Additionally, Zeratsky recommends taking smaller doses of calcium throughout the day, as doses greater than 600 mg at a time are not as well absorbed.Related: Can Vitamin and Mineral Supplements Really Help You Lose Weight?