What Harvard Health Wants You to Know About Brain Supplements

A recent Harvard Health Publishing article delivers an important reality check for anyone considering brain health supplements: don't buy into the hype. Despite billions spent annually on "nootropics" and "cognitive enhancers," the scientific evidence doesn't support their claims—and some products may actually pose serious health risks.

The Harvard Warning: Why Experts Are Concerned

Harvard Medical School researchers have consistently warned that the brain supplement market is fraught with problems. Dr. Pieter Cohen, a physician and associate professor at Harvard Medical School, identified a disturbing pattern: many over-the-counter brain supplements contain unlisted, unapproved pharmaceutical drugs that aren't legal in the United States.

In one study published in Neurology, Cohen's team found unapproved drugs—including analogs of piracetam, vinpocetine, phenibut, and picamilon—in 10 different brain supplements tested. These substances appeared in doses up to four times higher than typical therapeutic levels, with some combinations presenting unknown risks to consumers.

Two Reasons to Avoid Brain Supplements

According to Dr. Cohen, consumers should steer clear of brain-boosting supplements for two critical reasons:

1.      No proven efficacy — "I'm not aware of any supplement ingredient that's legal [and] can improve memory and cognitive function," Cohen stated.

2.      Hidden dangers — These products may contain potent pharmaceutical drug and/other chemical substances not approved for use in the United States, without the extensive safety and efficacy studies required for FDA-approved prescription drugs.

What the Research Actually Shows

The Global Council on Brain Health (GCBH)—an independent collaborative of scientists, doctors, and policy experts brought together by AARP—conducted an extensive evidence review of brain-health supplements. Their conclusion, published in 2019: they could not endorse any ingredient, product, or supplement formulation designed for brain health.

For the small handful of supplements that have been well-researched, results showed no brain health benefit in people with normal nutrient levels.

There have been more recent comprehensive reports and systematic reviews since the 2019 GCBH statement, though the overall conclusions remain largely consistent with those findings.

The most recent comprehensive review published in 2024 in Age and Ageing provides an updated state-of-the-art assessment for clinicians on nutrition and dementia prevention.  This review emphasizes that strong evidence exists to support healthy, plant-based dietary patterns (Mediterranean, MIND, or Nordic diets) for maintaining cognitive function, but continues to find limited evidence for individual supplements. The World Health Organization and other leading public health bodies now support these dietary pattern recommendations rather than specific supplement formulations. 

A 2023 systematic review of over-the-counter memory supplements published in CNS Drugs examined 103 commercially available products and identified the 18 most common ingredients.  The authors concluded that there is currently no compelling evidence for use of apoaequorin, coenzyme Q10, coffee extracts, L-theanine, omega-3 fatty acids, vitamin B6, vitamin B9, or vitamin B12 supplementation for memory.  They found some evidence for ashwagandha, choline, curcumin, ginger, Lion's Mane, polyphenols, phosphatidylserine, and turmeric, but noted that "dietary supplements geared toward improving cognition are a billion-dollar industry that continues to grow despite lacking a solid scientific foundation for their marketing claims." 

Multiple Cochrane systematic reviews from 2018 (still considered current gold-standard evidence) concluded that vitamin and mineral supplementation strategies for cognitively healthy adults in mid or late life do not have meaningful effects on cognitive decline or dementia.  A 2021 systematic review in the Journal of Alternative and Complementary Medicine evaluated nine commonly marketed supplement ingredients and found that "the low level of certainty in the state of the science" combined with inconsistent and imprecise studies "hinder the ability to develop recommendations about using such ingredients for consumers interested in boosting their cognitive performance." 

A 2025 comprehensive review in the Journal of Alzheimer's Disease acknowledged that while vitamin deficiencies are associated with cognitive decline, "findings from epidemiological and clinical studies remain mixed" and emphasized "the need for further research to determine optimal dosing, efficacy, and long-term impact of vitamin supplementation in dementia prevention."

The evidence base has expanded, but the fundamental conclusion remains unchanged: no individual supplement ingredient or formulation can be endorsed for brain health in healthy adults based on current evidence. The focus has shifted toward whole dietary patterns rather than isolated supplements.

The FDA Regulation Gap

Unlike prescription medications, dietary supplements do not require FDA pre-market approval, safety testing, or efficacy evaluation before being sold to consumers. Under the Dietary Supplement Health and Education Act (DSHEA) of 1994, supplements are regulated as foods rather than drugs, which fundamentally limits the FDA's postmarket surveillance authority.

The FDA's role is primarily reactive—the agency can only take action after a product has entered the market and been identified as potentially unsafe.

This regulatory gap means companies can make bold claims about brain health without scientific backing, and consumers have little protection against adulterated, mislabeled or misbranded products.

The BrainSavers Approach: Evidence Over Hype

At BrainSavers, we believe in empowering you with scientific evidence-based strategies for cognitive health—not marketing hype. The Harvard Health findings reinforce why we at BrainSavers focus on:

• Lifestyle interventions with robust medical-science support, such as regular physical exercise, cognitive engagement, stress management and quality sleep

• Foundational nutritional approaches through natural, unprocessed or minimally processed whole foods rather than isolated supplements

• Consulting your doctor or a licensed nutritionist for addressing specific nutrient deficiencies diagnosed through proper testing

• If you're concerned about nutrient deficiencies—such as vitamin B-12, which can cause neurological damage and a dementia syndrome—consult your healthcare provider. A simple blood test can identify deficiencies that require treatment, which is much sounder approach than taking unproven supplements.

The Bottom Line

As the Harvard Brain Health article says: “The question remains: with no evidence, why do people still buy into brain health supplements? A major reason seems to be that it’s easier to take a pill than to make lasting lifestyle changes.

Instead, invest in doing more exercise and following a plant-based diet. These can help with memory and brain health in the long term more than any supplement.”

That statement is a fundamental truth when it comes to healthy brain (and body) health through the lifespan.

The Harvard message is clear: save your money and protect your health by avoiding brain health supplements that make promises they can't keep. Instead, focus on proven strategies for maintaining cognitive function as you age.

Have questions about evidence-based approaches to brain health? We're here to help you navigate the science and separate fact from fiction.