Walk into any pharmacy or browse an online supplement store, and you’ll find hundreds of products promising better energy, stronger immunity, healthier skin, and improved overall wellness.
From vitamin D and B12 to multivitamins and magnesium, the options can feel overwhelming. So, what vitamins should you actually take?
The answer depends on your age, diet, lifestyle, medical history, and whether you have any nutritional deficiencies. While certain vitamins are essential for good health, that doesn’t mean everyone needs to take them as supplements. In fact, taking unnecessary vitamins or excessive doses can sometimes do more harm than good.
Understanding which nutrients your body needs, where to get them, and when blood testing may help can support more informed decisions.
Do You Really Need to Take Vitamins Every Day?
Not necessarily. Vitamins are essential nutrients that support functions such as energy metabolism, immune health, red blood cell production, and bone maintenance. However, many people can obtain sufficient amounts through a balanced diet.
A supplement may be beneficial when:
- Your diet doesn’t provide enough of a particular nutrient.
- You have a diagnosed vitamin deficiency.
- You’re pregnant or planning to become pregnant.
- You follow a restrictive diet, such as a vegan diet.
- You have a medical condition that affects nutrient absorption.
- Your healthcare provider recommends supplementation based on your individual needs.
The National Institutes of Health Office of Dietary Supplements explains that supplements can help people meet nutritional needs but shouldn’t replace a varied, nutritious diet.
Which Vitamins Should You Consider Taking?
Certain vitamins are more commonly discussed because deficiencies can occur in specific populations. Here’s what you should know about some of the most important ones.
1. Vitamin D: For Bone and Muscle Health
Vitamin D helps the body absorb calcium and supports bone, muscle, and immune function. Your body can produce vitamin D through sunlight exposure, but limited sun exposure, age, skin pigmentation, and certain medical conditions can affect vitamin D status.
Potential signs of significant deficiency include:
- Muscle weakness
- Bone pain
- Increased risk of fractures
- Fatigue, although this is nonspecific
Vitamin D is found in fatty fish, fortified dairy products, fortified plant-based milk, and some other foods.
Should you take it?
Supplementation may be appropriate if you have inadequate intake, a diagnosed deficiency, or certain risk factors. A 25-hydroxy vitamin D blood test can help assess vitamin D status when testing is clinically indicated. However, routine vitamin D testing is not recommended for every healthy adult.
Learn more from the NIH vitamin D fact sheet.
2. Vitamin B12: For Nerves and Red Blood Cells
Vitamin B12 plays an important role in nerve function, DNA production, and healthy red blood cell formation. It’s naturally present in animal-based foods, including meat, fish, eggs, and dairy products.
People following vegan diets may have difficulty obtaining enough B12 without fortified foods or supplements. Others at increased risk of deficiency include older adults and individuals with certain digestive or absorption disorders.
Possible deficiency symptoms include:
- Fatigue or weakness
- Numbness or tingling in the hands and feet
- Balance difficulties
- Memory or concentration problems
- Anemia
Should you take it?
B12 supplements may be particularly important for vegans and people with diagnosed deficiency or impaired absorption. A vitamin B12 blood test can help evaluate suspected deficiency. Additional testing may sometimes be needed to clarify borderline results.
3. Vitamin C: For Immune Function and Tissue Repair
Vitamin C supports immune function, collagen formation, wound healing, and antioxidant activity. It also helps the body absorb iron from plant-based foods.
Good dietary sources include citrus fruits, strawberries, bell peppers, broccoli, and tomatoes.
Should you take it?
Most people who regularly eat fruits and vegetables can obtain enough vitamin C from food. Supplementation may help when dietary intake is inadequate, but high doses don’t guarantee better immunity or prevent every illness.
Excessive vitamin C can cause gastrointestinal symptoms such as diarrhea and abdominal discomfort.
4. Folate (Vitamin B9): Especially Important Before Pregnancy
Folate helps the body produce DNA and healthy cells. It’s especially important during early pregnancy because adequate folic acid intake reduces the risk of neural tube defects.
Natural food sources include leafy greens, beans, lentils, and certain fruits. Folic acid is also added to fortified foods.
Should you take it?
People who could become pregnant are generally advised to obtain 400 micrograms of folic acid daily from supplements, fortified foods, or a combination, in addition to dietary folate. Individual needs may differ, especially during pregnancy or with certain medical conditions.
The CDC’s folic acid recommendations guide preventing neural tube defects.
5. Vitamin A: For Vision and Immune Health
Vitamin A supports vision, immune function, and normal growth and development. Sources include eggs, dairy products, liver, carrots, sweet potatoes, and leafy greens.
Should you take it?
Most people can meet their vitamin A requirements through food. High doses of preformed vitamin A can be toxic, and excessive intake during pregnancy can harm fetal development.
For this reason, high-dose vitamin A supplements should not be taken without appropriate medical guidance.
6. Vitamin E: For Cell Protection
Vitamin E is an antioxidant that helps protect cells from oxidative damage. It’s found in nuts, seeds, vegetable oils, and some green vegetables.
Should you take it?
Vitamin E deficiency is uncommon in otherwise healthy people. High-dose vitamin E supplements are generally unnecessary and may increase bleeding risk, particularly in people taking certain medications.
What About Magnesium, Iron, and Calcium?
Although they’re often grouped with vitamins in supplement discussions, magnesium, iron, and calcium are minerals, not vitamins. They still play essential roles in health.
| Nutrient | Main functions | When supplementation may be considered |
| Magnesium | Muscle and nerve function, energy production | Inadequate intake, certain deficiencies or medical conditions |
| Iron | Hemoglobin production and oxygen transport | Diagnosed iron deficiency, certain pregnancy-related needs |
| Calcium | Bone and teeth health | Inadequate dietary intake or certain bone-health needs |
| Zinc | Immune function and wound healing | Diagnosed deficiency or inadequate intake |
Iron deserves particular attention because taking it unnecessarily can cause side effects and, in excessive amounts, toxicity. If you suspect iron deficiency, a healthcare professional may recommend a complete blood count (CBC) and ferritin testing before supplementation.
What Vitamins Should Women Take?
Women’s nutritional needs vary depending on age, menstrual history, pregnancy status, diet, and health conditions. Some nutrients deserve particular attention during different life stages.
During reproductive years: Iron may be important for women with heavy menstrual bleeding, while folic acid is essential for those who could become pregnant.
During pregnancy: Prenatal vitamins are commonly recommended to help meet increased nutritional needs.
During perimenopause and menopause: Calcium and vitamin D support bone health, although supplementation depends on dietary intake and individual risk factors.
For women following vegan diets: Vitamin B12 supplementation is often necessary.
No single supplement combination is right for every woman.
What Vitamins Should Men Take?
Men also have varying nutritional needs depending on diet, age, activity level, and medical history. Vitamin D, vitamin B12, and other nutrients may matter when intake is inadequate, or deficiency risk is elevated.
However, men generally shouldn’t take iron supplements routinely unless a specific medical indication exists. A standard multivitamin may help address dietary gaps, but it isn’t a substitute for healthy eating or preventive medical care.
Can Vitamins Help With Fatigue and Low Energy?
Many supplements are marketed as energy boosters.
However, fatigue can have numerous causes, including:
- Poor sleep
- Stress
- Anemia
- Thyroid disorders
- Vitamin B12 deficiency
- Iron deficiency
- Certain chronic medical conditions
If fatigue is caused by a nutritional deficiency, correcting that deficiency may improve symptoms. But taking extra vitamins when your levels are already adequate won’t necessarily increase energy.
For persistent fatigue, identifying the underlying cause is more useful than trying multiple supplements without a clear reason.
Should You Take a Multivitamin?
A multivitamin can be convenient for people who struggle to meet certain nutritional requirements through food. However, research hasn’t consistently shown that daily multivitamins prevent major chronic diseases in otherwise healthy adults.
Before choosing one, consider whether you actually need the nutrients it contains. Some multivitamins may provide more than the recommended daily amount of certain vitamins or minerals, particularly when combined with other supplements.
Reviewing the Supplement Facts label can help you avoid unintentionally doubling up on ingredients.
Can You Take Too Many Vitamins?
Yes. Although vitamins are essential, excessive intake can cause health problems. Fat-soluble vitamins, including A, D, E, and K, can accumulate in the body.
For example:
- Too much vitamin D can raise calcium levels and cause kidney complications.
- Excessive preformed vitamin A can cause liver toxicity and other serious effects.
- High-dose vitamin E may increase bleeding risk.
- Excessive vitamin B6, although water-soluble, can cause nerve damage.
Supplements may also interact with prescription medications. More isn’t always better, especially with concentrated products.
How Do You Know Which Vitamins You’re Deficient In?
Symptoms alone aren’t always reliable indicators of vitamin deficiencies. Fatigue, weakness, hair changes, and difficulty concentrating can have multiple causes.
Blood testing can help identify certain nutritional deficiencies when there’s a medical reason to investigate them.
Common tests include:
Vitamin D (25-Hydroxy) Test
Measures the main circulating form of vitamin D and helps evaluate vitamin D status.
Vitamin B12 Test
Measures vitamin B12 in the blood and may help investigate anemia, neurological symptoms, or suspected deficiency.
Folate Test
May be useful in selected cases when folate deficiency is suspected.
Iron and Ferritin Tests
Help evaluate iron status and possible iron deficiency.
Complete Blood Count (CBC)
Can identify certain patterns of anemia, although it doesn’t directly measure vitamin levels.
Not every vitamin deficiency can be reliably diagnosed with a routine blood test, and broad testing panels aren’t necessary for everyone.
The most useful tests depend on your symptoms, diet, medical history, and risk factors.
Vitamin Deficiency and Nutritional Blood Testing in Kansas City, MO & Overland Park, KS
If you’re unsure whether you need vitamin supplements, appropriate laboratory testing may help answer specific questions about your nutritional health.
Test Smartly Labs offers direct-access vitamin and nutritional blood testing throughout the Kansas City metropolitan area, including options for people investigating possible vitamin deficiencies, fatigue, and general wellness concerns.
Depending on your needs, available testing options may include:
- Vitamin D testing
- Vitamin B12 testing
- Folate testing
- Iron and ferritin testing
- Complete blood count (CBC)
- Other nutritional and wellness blood panels
Frequently Asked Questions
What vitamins should I take every day?
No single vitamin supplement is needed by everyone. Your requirements depend on your diet, age, health conditions, and other factors. Some people benefit from vitamin D, B12, or folic acid supplementation, while others can meet their needs through food.
What are the most common vitamin deficiencies?
Vitamin D and vitamin B12 deficiencies are important concerns in certain populations. Iron deficiency is also common, although iron is a mineral rather than a vitamin.
Should I take vitamin D and B12 together?
They can generally be taken together when appropriate, but you should first determine whether you need either supplement and what dose is suitable.
What vitamins help with tiredness?
Vitamin B12, folate, and other nutrients support normal energy metabolism. However, supplementation is most helpful when fatigue is related to a deficiency. Iron deficiency and thyroid disorders can also cause fatigue.
Is it better to take a multivitamin or individual vitamins?
It depends on your needs. A multivitamin may help fill dietary gaps, while individual supplements can be more appropriate when a specific deficiency has been identified.
Can I find out which vitamins I’m lacking through a blood test?
Blood tests can help identify certain deficiencies, including vitamin D and B12. However, no single routine test accurately evaluates every vitamin and mineral in your body.
Where can I get vitamin deficiency testing near Kansas City?
Test Smartly Labs offers vitamin and nutritional blood testing at locations in Kansas City, MO; Overland Park, KS; and Independence, MO. Available tests can help investigate specific nutritional concerns when testing is appropriate.
Final Thoughts
So, what vitamins should you take?
For most people, the answer starts with a balanced diet and an understanding of individual nutritional needs—not a long list of supplements. Vitamin D, B12, folate, and other nutrients are important for good health, but supplementation is most useful when you have a clear reason to take them.
Rather than guessing based on symptoms or supplement marketing claims, consider your diet, medical history, and whether targeted blood testing is appropriate.
If you’re looking for vitamin deficiency testing in Kansas City, Overland Park, or Independence, Test Smartly Labs offers convenient laboratory testing options to support informed decisions about your nutritional health.
