Four Common Myths About the Safety of Vitamins and Supplements

When many people think about vitamins and supplements (collectively referred to here as ‘supplements’), two ideas often come to mind:

• They’re natural
• They’re safe

In many cases, this may be true — but the reality is more nuanced.

To understand supplement safety, we need to look beyond assumptions and marketing messages.

Before exploring four common myths about supplement safety, let’s first define what “supplement safety” really means.

 

What Does Supplement Safety Mean

Supplement safety refers to whether an ingredient is likely to be safe when used as directed, based on:

• Scientific evidence
• Historical use
• Appropriate quality and manufacturing controls

Quality controls matter because they help ensure that the product being sold matches the ingredient and dosage studied in research.

People often describe any discomfort related to supplement use as a “side effect.”

You may also hear the terms adverse reaction or adverse event.

While these terms are sometimes used interchangeably, they are not exactly the same:

Understanding these distinctions helps put supplement safety into perspective.

 

How Do We Know If Supplements Are Safe?

Here’s an important fact many people don’t realize:

 

Supplements are not approved by the U.S. Food and Drug Administration (FDA) before they are marketed in the U.S.

 

It’s easy to assume that because supplements are often considered natural and generally safe, FDA review isn’t necessary.

In addition, supplements are regulated by the FDA as a category of food[1], and most foods do not require FDA review or approval before being marketed.

That idea makes sense at first — but the reality is more nuanced.

Under U.S. law, supplement ingredients must meet specific requirements to be legally marketed.

There are three primary pathways for supplement ingredients in the U.S.:

1. Generally Recognized As Safe (GRAS) 

An ingredient may be considered GRAS based on the following factors:

• Expert consensus: Qualified experts agree the ingredient is safe
• Science-based: Supported by published research or a long history of food use
• Amount matters: Safety depends on the intake levels

2. Old dietary ingredients (ODIs)

• Ingredients marketed in the U.S. before October 15, 1994
• Supported by documented history of safe use

3. New dietary ingredients (NDIs)

• Ingredients introduced after October 15, 1994
• Require an NDI notification submitted to the FDA before marketing
• Must include safety data at intended intake levels
• Subject to FDA review, and may not be marketed if FDA raises safety concerns

Overall, all three pathways are supported by scientific data and expert interpretation.

That responsibility ultimately falls on supplement companies, which are legally required to ensure their products are safe and properly labeled.[2]

While many companies aim to comply with these requirements, the system places a significant burden on manufacturers.

Research has shown potential quality and labeling concerns across the industry, including:

• Wide ranges in labeling accuracy across different studies[3],[4],[5]
• Detection of undeclared or unexpected ingredients, particularly in certain high-risk product categories.[6]
• Limited use of third-party quality certifications[7],[8] – among the most trusted standards for supplement quality.[9]

These findings do not prove that supplements are unsafe, but they do highlight why quality, transparency, and consumer education matter.

In addition, gaps between what consumers understand and what scientific evidence actually shows may contribute to misconceptions about supplement safety (see image below).

Because of these complexities, it’s often wise to consult healthcare providers (HCPs), reputable manufacturers, and credible scientific sources when evaluating supplement use.

Now, let’s take a closer look at four common myths about supplement safety.

 

Four Common Myths About Supplement Safety

Myth 1: “Supplements are natural, so they must be safe”

“Natural” is one of the most common terms used in supplement marketing — but it can be misleading.

Consider the following facts:

1. Whether natural or synthetic, all foods, supplements, and medicines are made from the same basic building blocks: chemical molecules.
2. Supplements can be produced in several ways:
   • Extracted from natural resources
   • Produced through fermentation
   • Chemically synthesized

Regardless of how an ingredient is sourced, some level of processing is almost always needed to ensure consistency and quality.

In other words, there is no such thing as a 100% natural, completely unprocessed supplement.

1. While traditional diets and natural remedies played important roles historically, average life expectancy was substantially shorter in the past.
   • In 1900, average life expectancy in the U.S. was about 33–49 years, depending on race and gender.[10] Today it is about 78 years.[11]
   • Advances in nutrition, sanitation, medicine, and science have all contributed to longer lifespans today.

Bottom line: “Natural” is not a safety guarantee.

Decisions about supplements should be based on scientific evidence, product quality, and appropriate use — not simply whether something is labeled as “natural.”

 

Myth 2: “Supplements don’t have side effects”

Some people strongly believe that supplements are completely safe and have no side effects.

Let’s take a look at what the data actually show.

1. Each year in the U.S., an estimated 23,000 emergency room (ER) visits are linked to supplement use.[12]
2. Not all supplement ingredients carry the same level of risk.[13]

It’s important to keep perspective: medicines account for far more ER visits overall.

Each year, Millions of ER visits are linked to medicine use.[14]

However, this does not mean supplements are risk-free.

Key takeaway:

1. Supplements can cause side effects in some individuals.
2. Safety considerations should be evaluated on a case-by-case basis.

 

Myth 3: “Supplements don’t need scientific evidence because they’re generally safe”

In reality, science is the reason many supplements are considered safe in the first place.

A supplement is not inherently safe simply because it exists on the market.

At a high level, safety determinations typically consider:

1. Research studies
2. Historical use
3. Dosage and duration

Consumers should be especially cautious with new or trendy ingredients where human safety data may be limited.

Science first. Trends second.

 

Myth 4: “All supplements are unsafe”

Paradoxically, there are also people who fall into the other extreme when it comes to supplement safety.

This group generally falls into two camps:

1. The unbelievers: “I think supplements are simply unsafe because there’s no science or data behind them.”
2. The skeptics: “I’m skeptical about supplements. If I feel discomfort after taking one, I tend to assume the supplement is the cause.”

These broad generalizations are often untrue.

 

Busting the myth from the unbelievers

The truth is that the level of scientific support varies widely across supplement ingredients.

Some ingredients are supported by multiple well-designed human studies, while others may have limited or no human research.

For example, berberine has a relatively strong body of evidence supporting its role in normal heart and metabolic health.

However, evidence for its use in other health areas may be less robust.

 

Busting the myth from the skeptics

Skeptics may be quick to blame supplements for any discomfort they experience.

In reality, it can be difficulty to determine whether a supplement is truly the cause.

Many factors can influence how we feel throughout the day.

For instance, someone may take a supplement intended to support heart and metabolic health, then later engage in more physical activity than usual — such as running extra laps.

Feeling unusually tired afterward could be attributed to the supplement, the exercise, or a combination of factors (illustrated below).

When in doubt, it’s a good idea to talk with a healthcare provider or the supplement manufacturer to better understand potential causes and next steps.

 

Final Thoughts

Supplements can play a role in supporting overall health and well-being.

However, broad assumptions that they are either entirely safe or entirely unsafe are oversimplifications.

A thoughtful approach includes:

• Looking at scientific evidence related to safety
• Choosing reputable manufacturers that follow quality standards
• Considering individual health needs
• Talking with qualified HCPs when appropriate

By focusing on data, logic, and transparency, we can make more informed decisions about supplement safety — beyond common myths.

 

Sincerely,

Derek Tang, PhD, MS, BSPharm

Truth Full Health

Your Trusted Supplement Partner

 

Disclaimer: All blogged content is for informational purposes only and does not replace professional medical advice. Information related to supplement safety is general in nature and may not apply to every individual. Statements made about vitamins or supplements (officially called “dietary supplements”) have not been evaluated by the U.S. Food and Drug Administration (FDA). Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare provider before beginning any new supplement, diet, or lifestyle program. We encourage readers to review the cited studies and to contact us with general questions; we cannot provide individualized medical advice.

 

[1] https://www.fda.gov/drugs/news-events-human-drugs/fdas-regulation-dietary-supplements-dr-cara-welch

[2] U.S. Food and Drug Administration. FDA 101: Dietary Supplements. Updated June 2, 2022. Accessed January 31, 2026. https://www.fda.gov/consumers/consumer-updates/fda-101-dietary-supplements

[3] Title: Analysis of Select Dietary Supplement Products Marketed to Support or Boost the Immune System.
First author: C Crawford. Journal: JAMA Network Open. Year of publication: 2022.

[4] Title: Resveratrol Food Supplement Products and the Challenges of Accurate Label Information to Ensure Food Safety for Consumers. First author: M Bensa. Journal: Nutrients. Year of publication: 2023.

[5] Title: Label Accuracy of Weight Loss Dietary Supplements Marketed Online With Military Discounts. First author: C Crawford. Journal: JAMA Network Open. Year of publication: 2024

[6] Title: Prevalence of adulteration in dietary supplements and recommendations for safe supplement practices in sport. First author: AR Jagim. Journal: Frontiers in Sports and Active Living. Year of publication: 2023.

[7] Title: Third-Party Evaluation: A Review of Dietary Supplements Dispensed by Military Treatment Facilities From 2007 to 2011. First author: DR Jones. Journal: Military Medicine. Year of publication: 2015.

[8] Title: Third-Party Certification of Dietary Supplements: Prevalence and Concerns. First author: A Cancio. Journal: Military Medicine. Year of publication: 2012.

[9] The quality of a supplement means it has the right ingredients, in the right amounts, and is free from harmful contaminants.

[10] SeniorLiving.org. 1900-2000: Changes In Life Expectancy In The United States. Published November 21, 2025. Accessed January 31, 2026. https://www.seniorliving.org/history/1900-2000-changes-life-expectancy-united-states/

[11] Centers for Disease Control and Prevention (CDC). Life Expectancy – FastStats. Updated November 9, 2023. Accessed January 31, 2026. https://www.cdc.gov/nchs/fastats/life-expectancy.htm

[12] Title: Emergency department visits for adverse events related to dietary supplements. First author: N Shehab. Journal: New England Journal of Medicine. Year of publication: 2015.

[13] Title: An Increase in Dietary Supplement Exposures Reported to US Poison Control Centers. First author: N Rao. Journal: Journal of Medical Toxicology. Year of publication: 2017

[14] Title: US Emergency Department Visits Attributed to Medication Harms, 2017-2019. First author: DS Budnitz. Journal: JAMA. Year of publication: 2021