Sound Advice: July 15, 2026

Do you really need vitamin supplements?

Usually, no—most healthy adults who eat a reasonably balanced diet do not need vitamin supplements, and studies have not shown broad benefits from routine multivitamins for preventing heart disease, cancer, memory decline or early death. Supplements are most useful when there is a real need, such as a proven deficiency, a restricted diet, pregnancy or certain medical conditions that affect absorption.

When supplements make sense

• A blood test shows a deficiency, such as vitamin B12 or vitamin D.
• You are pregnant or trying to conceive; folic acid is the big exception because it helps prevent neural tube defects.
• You have a condition that limits absorption, such as celiac disease, Crohn’s disease or bariatric surgery.
• You follow a very limited diet, such as veganism, where B12 is commonly needed.

Why food usually wins

Food gives you vitamins along with fiber, protein, and other compounds that pills do not provide, and experts consistently say supplements are not a substitute for a healthy diet. Some nutrients are also better absorbed from food, and taking more than you need can be harmful, especially with certain fat-soluble vitamins and high-dose products.

Practical rule

If your diet is varied and you do not have a known deficiency or special situation, you probably do not need a vitamin supplement. If you are considering one, the best first step is to identify the specific nutrient and the reason for taking it rather than using a general multivitamin “just in case”.

Which supplements are actually worth considering by age, diet or health condition?

Some supplements are worth considering, but mostly when a specific need exists rather than as a routine habit. The clearest cases are pregnancy, older age, vegan or very restricted diets, and certain medical conditions or medications that raise deficiency risk.

By life stage

• Pregnancy or trying to conceive: Folic acid is the big one, because it lowers the risk of certain birth defects.
• Age 50+: Vitamin B12 becomes more worth discussing because absorption can drop with age, and vitamin D and calcium are often relevant for bone health.
• Older adults with low sun exposure or low dietary intake: Vitamin D is commonly considered, especially if blood levels are low.

By diet pattern

• Vegan or strict vegetarian: B12 is the most important routine consideration because natural food sources are mainly animal-based.
• Low fish intake: Omega-3 supplements may be reasonable for some people, especially those with cardiovascular disease who do not eat fish regularly.
• Low fiber intake: A fiber supplement can help meet intake goals and support bowel regularity.

By health condition

• Bone health concerns or osteoporosis risk: Calcium and vitamin D may be useful, especially if intake is low.
• Age-related macular degeneration: A specific AREDS formula can slow further vision loss in people who already have AMD.
• Certain digestive or absorption problems: B12, iron, vitamin D or other nutrients may be needed depending on the condition, but this should be individualized.

Usually not worth it

• Routine multivitamins for otherwise healthy adults generally have weak evidence for preventing major disease.
• High-dose antioxidant supplements are not a good default choice and can sometimes be harmful.
• “Energy” or “immune boost” products often have much less evidence than the marketing suggests.

Practical way to decide

1. Start with diet, age, and medications.
2. Check whether there is a real deficiency risk or a condition with evidence-based benefit.
3. Prefer targeted supplements over broad “everything” formulas.
4. Use blood tests or clinician guidance when the answer is unclear.

A simple example: A 30-year-old omnivore with a varied diet usually does not need much beyond maybe folic acid if planning pregnancy, while a 65-year-old vegan is much more likely to benefit from B12 and possibly vitamin D.

Here’s a practical ranking of supplements with the strongest evidence for meaningful benefit, followed by those with narrower or more conditional support. The key idea is that the best-supported supplements usually help specific people or specific problems, not everyone.

Strongest evidence

1. Creatine monohydrate — One of the best-studied performance supplements; it reliably improves strength, power, and lean mass when paired with training.
2. Folic acid in pregnancy — There is strong evidence that it reduces neural tube defects, so it’s one of the clearest “must-consider” supplements for people who could become pregnant.
3. Vitamin B12 for deficiency or vegan diets — There is very strong evidence when intake or absorption is inadequate, because deficiency can cause serious neurologic and blood problems.
4. Vitamin D for deficiency or low sun exposure — Helpful when blood levels are low; evidence is strongest for correcting deficiency and supporting bone health.
5. Calcium for low intake / bone health risk — Best supported when dietary calcium is inadequate and fracture risk is a concern.

Moderate evidence

6. Protein supplements — Useful if you cannot consistently meet protein needs from food, especially for older adults, athletes or people recovering from illness.
7. Omega-3 fish oil — Reasonable for some people who do not eat fish regularly, especially those with cardiovascular disease; it is not a universal health booster.
8. Fiber supplements — Helpful when diet falls short, especially for bowel regularity and meeting intake targets.
9. AREDS eye formula — Evidence-based for people who already have moderate or advanced age-related macular degeneration, but not for prevention in healthy eyes.

Weaker or mixed evidence

10. Magnesium — Can help when you are deficient, but broad health claims are often overstated.
11. Iron — Very useful when deficiency is confirmed, but not a good default supplement because excess iron can be harmful.
12. Multivitamins — Convenient, but large studies generally have not shown major disease-prevention benefits for healthy adults.
13. Antioxidant blends — Poor evidence overall, and some high-dose forms have shown harm in trials.

Bottom line

The most evidence-based supplements are usually targeted: creatine for training, folic acid for pregnancy, B12 for vegans or deficiency, vitamin D and calcium for bone-related needs, and protein or fiber when diet falls short. For healthy people eating a varied diet, multivitamins and “all-purpose” formulas are usually much lower on the list.

  

N. Russell Wayne

Weston, CT  06883

 203-895-8877

 

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