Supplements and the Right Way to Use Them

In a perfect world, a balanced diet would provide every vitamin and mineral our bodies need. In reality, nearly three in five American adults now turn to dietary supplements to fill nutritional gaps or boost their health, fueling a $60-billion-a-year industry . But as the market expands, so does the confusion. With social media influencers promoting untested cure-alls and AI chatbots dispensing questionable advice, it’s increasingly hard to separate fact from hype .

Supplements can be beneficial, but they can also be risky. This guide cuts through the noise to help you understand what supplements are, when they are truly needed, and the safest way to incorporate them into your life.

Part One: Understanding Supplements and Their Regulation

Before taking any supplement, it is helpful to understand what these products actually are and how they are regulated—or rather, how they are not.

What Are Dietary Supplements?

Dietary supplements are intended to add to—or “supplement”—your diet . They come in many forms, including tablets, capsules, powders, gummies, and liquids, and are meant to be ingested . Common types include :

Vitamins: Such as multivitamins, vitamin D, and biotin.
Minerals: Like calcium, magnesium, and iron.
Botanicals or Herbs: Such as echinacea, ginger, and curcumin.
Amino Acids: For example, tryptophan and glutamine.
Live Microbials: Commonly known as probiotics.

The Regulatory Reality

A critical point to understand is that the U.S. Food and Drug Administration (FDA) does not have the authority to approve dietary supplements for safety and effectiveness before they are sold to the public . They are regulated as a category of food, not drugs .

This means that supplement companies are responsible for ensuring their products are safe and that their label claims are truthful, but the FDA primarily steps in after products are already on the market . While the FDA can take action against unsafe products, such as issuing warnings or requesting recalls, this post-market approach means that many products can be sold without any prior review of their contents or claims .

Part Two: When Supplements Are (And Aren’t) Necessary

The first question to ask is not what to take, but whether you need to take anything at all.

Who Really Needs Supplements?

The experts agree: supplements typically make sense only for those with a proven deficiency, a restricted diet, or a specific condition known to benefit from them .

Restricted Diets: People with highly limited diets can benefit from supplements. For example, vegans are advised to take vitamin B12, which is typically found in animal products, and should also consider calcium, zinc, iron, and vitamin D .
Life Stages and Conditions: Those who are pregnant should take prenatal vitamins containing folic acid and omega-3 fatty acids . People over age 50 may need extra nutrients like calcium, vitamin D, and vitamin B12 to promote bone and nerve health . Supplements have also been proven to help with conditions like osteoporosis, high triglycerides, and age-related macular degeneration .
Medication Effects: Individuals taking GLP-1 agonists (like Ozempic) or who have undergone bariatric surgery likely need additional nutrients because they are eating less .

Who Can Skip Them?

For others, a good-quality multivitamin isn’t usually harmful, but it may be unnecessary . As one expert notes, “if someone is eating a varied-enough diet, they should be getting all their nutrition through that” .

Blood tests can show if you are clinically deficient in certain vitamins or minerals . If you are feeling fatigued or having other symptoms, it is wise to look at the major pillars of well-being first: “Are you getting enough calories, carbs, fats, proteins? Are you getting enough sleep? These are the big drivers” .

Part Three: The Right Way to Take Supplements

If you and your healthcare provider have decided that supplements are the right choice for you, proper usage is key to both safety and effectiveness.

1. Always Consult a Professional First

Before starting any supplement, talk with a doctor, pharmacist, or registered dietitian . This is non-negotiable. Many supplements can interact with prescription or over-the-counter medications, sometimes dangerously . For example :

Vitamin K can make blood thinners less effective.
St. John’s Wort interacts with almost every prescription medication you can think of, including antidepressants .
Ginkgo biloba and omega-3s have mild blood-thinning effects and can increase the risk of bleeding when combined with blood thinners or aspirin .
Calcium, magnesium, and iron can block the absorption of thyroid hormone medication .

Share the details: Bring the actual bottles of your supplements to your appointments so your care team can check for interactions and read ingredient lists .

2. Understand Dosage and Timing

“More” is not better. Higher doses do not lead to better results and can backfire . For example, too much vitamin B6 can damage nerves, and high doses of omega-3s can trigger irregular heartbeat in some people . Aim for a supplement that provides around 100% of the Recommended Dietary Allowance (RDA) and stay under the Tolerable Upper Intake Level (UL) .
Take supplements at the right time. The absorption of some supplements depends on when and how you take them .
- Calcium citrate can be taken with or without food, but calcium carbonate should be taken with food .
- If you are taking a large dose, split it. For example, taking 1,000 mg of calcium a day should be split into two or more doses of 500 mg or less .
- Calcium, magnesium, zinc, and iron all compete for absorption. To get the most from them, take them at different times of the day . Taking magnesium at night can even support better sleep .
Check for interactions with food. The tannins in green or black tea can bind to iron, blocking its absorption, so do not drink tea at the same time as your iron supplement .

3. Choose High-Quality Products

Because the FDA does not verify the contents of supplements, you have to do your homework .

Look for third-party verification. The supplements industry can vary widely in purity and dosage . Independent groups like US Pharmacopeia (USP), NSF, or Consumer Lab test products to verify that they contain the ingredients and amounts listed on the label . Look for their seals on the bottle.
Beware of “natural” claims. Do not assume that “natural” means safe. Some “natural” products, like turmeric pills, have been found to contain high doses of heavy metals .
Check the expiration date. Do not buy supplements that have expired or that will expire before you can finish the bottle .

Conclusion: Supplements as a Supporting Actor

The most important takeaway is that supplements are meant to supplement a healthy lifestyle, not replace it . “Focus on eating whole foods and a variety of foods,” says a clinical dietitian . “People think it’s easier to take a pill than to go exercise. True, but it doesn’t make it better” .

A supplement cannot make up for unhealthy eating habits or a sedentary life. Think of your health as a play: diet and exercise are the lead actors; supplements are supporting cast members who can shine in the right role, but they can never carry the show alone.