A nutrient that the body needs in small amounts to function and stay healthy. Vitamin A helps in vision, bone growth, reproduction, growth of epithelium (cells that line the internal and external surfaces of the body), and fighting infections. It is fat-soluble (can dissolve in fats and oils). Vitamin A is found in liver, egg yolks, and whole milk dairy products from animals and in fish oils. It can also be made in the body from a substance found in some fruits and vegetables, such as cantaloupes, carrots, spinach, and sweet potatoes. Vitamin A is being studied in the prevention and treatment of some types of cancer. Also called retinol.

NIH National Cancer Institute, https://www.cancer.gov/publications/dictionaries/cancer-terms/def/vitamin-a

Vitamin C, also known as ascorbic acid, is a water-soluble nutrient found in some foods. In the body, it acts as an antioxidant, helping to protect cells from the damage caused by free radicals. Free radicals are compounds formed when our bodies convert the food we eat into energy. People are also exposed to free radicals in the environment from cigarette smoke, air pollution, and ultraviolet light from the sun.

https://ods.od.nih.gov/factsheets/VitaminC-Consumer/

Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and many other biological effects. In humans, the most important compounds in this group are vitamin D₃ and vitamin D₂.

Wikipedia

Vitamin E is a nutrient that's important to vision, reproduction, and the health of your blood, brain and skin. Vitamin E also has antioxidant properties. Antioxidants are substances that might protect your cells against the effects of free radicals - molecules produced when your body breaks down food or is exposed to tobacco smoke and radiation. Free radicals might play a role in heart disease, cancer and other diseases. If you take vitamin E for its antioxidant properties, keep in mind that the supplement might not offer the same benefits as naturally occurring antioxidants in food.

https://www.mayoclinic.org/drugs-supplements-vitamin-e/art-20364144

Vitamin K is a nutrient that the body needs to stay healthy. It's important for blood clotting and healthy bones and also has other functions in the body. If you are taking a blood thinner such as warfarin (Coumadin®), it's very important to get about the same amount of vitamin K each day.

https://ods.od.nih.gov/factsheets/VitaminK-Consumer/

Vitamin B1, thiamin, or thiamine, enables the body to use carbohydrates as energy. It is essential for glucose metabolism, and it plays a key role in nerve, muscle, and heart function.

https://www.medicalnewstoday.com/articles/219545

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Riboflavin (also called vitamin B₂) is important for the growth, development, and function of the cells in your body. It also helps turn the food you eat into the energy you need.

https://ods.od.nih.gov/factsheets/Riboflavin-Consumer/

Niacin (also called vitamin B3) helps turn the food you eat into the energy you need. Niacin is important for the development and function of the cells in your body.

https://ods.od.nih.gov/factsheets/Niacin-Consumer/

Vitamin B6 is a vitamin that is naturally present in many foods. The body needs vitamin B6 for more than 100 enzyme reactions involved in metabolism. Vitamin B6 is also involved in brain development during pregnancy and infancy as well as immune function.

https://ods.od.nih.gov/factsheets/VitaminB6-Consumer/

Folate is a B-vitamin that is naturally present in many foods. Your body needs folate to make DNA and other genetic material. Your body also needs folate for your cells to divide. A form of folate, called folic acid, is used in fortified foods and most dietary supplements.

Vitamin B₁₂ is a nutrient that helps keep your body's blood and nerve cells healthy and helps make DNA, the genetic material in all of your cells. Vitamin B₁₂ also helps prevent megaloblastic anemia, a blood condition that makes people tired and weak.

https://ods.od.nih.gov/factsheets/VitaminB12-Consumer/

Biotin is a B-vitamin found in many foods. Biotin helps turn the carbohydrates, fats, and proteins in the food you eat into the energy you need.

https://ods.od.nih.gov/factsheets/Biotin-Consumer/

Pantothenic acid (also called vitamin B₅) helps turn the food you eat into the energy you need. It's important for many functions in the body, especially making and breaking down fats.

https://ods.od.nih.gov/factsheets/PantothenicAcid-Consumer/

Choline is a nutrient that is found in many foods. Your brain and nervous system need it to regulate memory, mood, muscle control, and other functions. You also need choline to form the membranes that surround your body's cells. You can make a small amount of choline in your liver, but most of the choline in your body comes from the food you eat.

https://ods.od.nih.gov/factsheets/Choline-Consumer/

Calcium is a mineral found in many foods. The body needs calcium to maintain strong bones and to carry out many important functions. Almost all calcium is stored in bones and teeth, where it supports their structure and hardness.

National Institutes of Health, Office of Dietary Supplements

Iron is a mineral that is naturally present in many foods, added to some food products, and available as a dietary supplement. Iron is an essential component of hemoglobin, an erythrocyte (red blood cell) protein that transfers oxygen from the lungs to the tissues. As a component of myoglobin, another protein that provides oxygen, iron supports muscle metabolism and healthy connective tissue. Iron is also necessary for physical growth, neurological development, cellular functioning, and synthesis of some hormones.

National Institutes of Health, Office of Dietary Supplements

Iodine is a mineral found in some foods. The body needs iodine to make thyroid hormones. These hormones control the body's metabolism and many other important functions. The body also needs thyroid hormones for proper bone and brain development during pregnancy and infancy. Getting enough iodine is important for everyone, especially infants and women who are pregnant.

https://ods.od.nih.gov/factsheets/Iodine-Consumer/

Magnesium is a mineral that's crucial to the body's function. Magnesium helps keep blood pressure normal, bones strong, and the heart rhythm steady.

https://www.webmd.com/diet/supplement-guide-magnesium#1

Zinc is found in cells throughout the body. It helps the immune system fight off invading bacteria and viruses. The body also needs zinc to make proteins and DNA, the genetic material in all cells. During pregnancy, infancy, and childhood, the body needs zinc to grow and develop properly. Zinc also helps wounds heal and is important for proper senses of taste and smell.

https://ods.od.nih.gov/factsheets/Zinc-Consumer/

Selenium is a nutrient that the body needs to stay healthy. Selenium is important for reproduction, thyroid gland function, DNA production, and protecting the body from damage caused by free radicals and from infection.

https://ods.od.nih.gov/factsheets/selenium-consumer/

Your body uses manganese to make energy and protect your cells from damage. Your body also needs manganese for strong bones, reproduction, blood clotting, and a healthy immune system.

https://ods.od.nih.gov/factsheets/Manganese-Consumer/

Chromium is an essential trace mineral that can improve insulin sensitivity and enhance protein, carbohydrate, and lipid metabolism.

https://www.medicalnewstoday.com/articles/288177

Your body uses molybdenum to process proteins and genetic material like DNA. Molybdenum also helps break down drugs and toxic substances that enter the body.

https://ods.od.nih.gov/factsheets/Molybdenum-Consumer/

Though often referred to as vitamin B8, inositol is not a vitamin at all but rather a type of sugar with several important functions. Inositol plays a structural role in your body as a major component of cell membranes. It also influences the action of insulin, a hormone essential for blood sugar control. In addition, it affects chemical messengers in your brain, such as serotonin and dopamine). It has been estimated that a typical diet in the US contains around 1 gram of inositol per day. Rich sources include grains, beans, nuts and fresh fruits and vegetables.

https://www.healthline.com/nutrition/inositol

Vitamin B10 (or vitamin Bx) is an alternative name for the organic compound PABA, a white crystalline substance. It's considered part of the vitamin B complex, although it's not a vitamin nor an essential nutrient. It's found in brewer's yeast, organ meat, mushrooms, whole grains, and spinach. Your body can also synthesize the compound using certain bacteria in your gut. PABA then assists in the production of folate (vitamin B9). Yet, the amount of folate produced is inadequate to meet your needs, so you need to obtain it from other dietary sources. PABA is thought to benefit skin and hair when taken as a supplement. It's industrially produced and sold in pill, powder, extract, and topical application form.

https://www.healthline.com/nutrition/vitamin-b-10

Rutin is a bioflavonoid, or plant pigment, that is found in certain vegetables and fruits. Apples are full of rutin. Buckwheat, most citrus, figs, and both black and green tea also contain rutin. Rutin has powerful antioxidant properties. It also helps your body produce collagen and use vitamin C.

https://www.healthline.com/health/potential-benefits-of-rutin

Silicon is a naturally occurring mineral. Many foods including water, beer, coffee, and some vegetables naturally contain silicon.

https://www.webmd.com/vitamins/ai/ingredientmono-1096/silicon

Boron helps your body metabolize key vitamins and minerals, has a key role in bone health, and it also affects estrogen and testosterone levels.

https://www.healthline.com/health/brains-bones-boron

Vanadium is a trace metal found in certain foods and beverages including water (in very small amounts). Vanadium is also sold in dietary supplement form.

https://www.verywellhealth.com/the-benefits-of-vanadium-89524