Does Prevagen Really Improve Memory? - (2024)


According to the Prevagen website, “Prevagen is an over-the-counter supplement for healthy brain function and memory improvement.” A disclaimer indicates that these statements are “Based on a clinical study of subgroups of individuals who were cognitively normal or mildly impaired.” Its package also claims that Prevagen supports “healthy brain function, sharper mind, and clearer thinking.”

However, as discussed below, there is little evidence that Prevagen (from Quincy Bioscience) provides any meaningful benefit in terms of memory improvement, and the extent of potential improvement appears to be minimal. Due to actions by the FTC, the marketing claims for Prevagen have been scaled back from earlier claims that it treats conditions such as head injuries and Alzheimer's disease.

Here are the details about Prevagen:

Prevagen Ingredients

The main ingredient in Prevagen is apoaequorin (10 mg per capsule, taken once daily). Apoaequorin is a protein first discovered in jellyfish, and is now apparently produced synthetically by genetically modified bacteria. According to the company, apoaequorin can help protect brain cells by binding to excess calcium, which might otherwise damage or destroy the cells - noting that excess calcium can result in memory impairment. However, there do not appear to be any studies that show apoaequorin, when taken orally, reaches the brain, or binds to enough excess calcium to reduce the risk of brain cell damage. The FDA has also warned Quincy Bioscience that the agency considers synthetic apoaequorin a "new drug" and therefore not an acceptable ingredient in a dietary supplement.

Prevagen also contains 50 mcg (2,000 IU) of vitamin D3 per capsule, which is more than twice the amount needed by most people, although below the Upper Tolerable Intake Level. The label suggests that a single capsule be taken daily “in the morning, with or without food.” As discussed in our Vitamin D Review, this is not the ideal way to take vitamin D, as it is best absorbed when taken with a meal that contains fats.

Prevagen Clinical Studies

There is little clinical evidence that Prevagen protects brain cells, or improves memory. Two of the three clinical studies cited by the company have not been published in a peer-reviewed journal. The first study reported that people who slept fewer than 7 hours per night and then took Prevagen daily for 3 months increased their amount of sleep by an average of 37 minutes per night. However, this study did not list the dose of Prevagen used, and was not blinded or placebo-controlled, making it difficult to draw any conclusions. The second clinical study found that men and women who took 10 mg of Prevagen daily for 3 months had significant improvements in word recall and remembering driving directions, but this study was also not blinded or placebo-controlled.

The third study was placebo-controlled and double-blinded (i.e., neither the patients or the researchers knew who was taking Prevagen and who was taking the placebo) and, in 2016, was published in a peer-reviewed journal. In the study, men and women (average age 62) with self-reported memory "concerns" but who were not diagnosed with a memory-impairment disorder took one 10 mg capsule of Prevagen daily for 3 months. No overall benefit was found. Further analysis of the results found that those who were cognitively normal had a 10.9% improvement in the number of items correctly recalled, but this was not a statistically significant improvement compared to a 3.8% increase among those given the placebo (Moran, Adv Mind Body Med 2016). The published study was authored entirely by employees of Quincy Bioscience, the marketer of Prevagen. Concerns about the quality of the study and the analysis of the results were raised by the FTC in 2017 when the agency charged Quincy Bioscience with making unsubstantiated claims.

Safety and Side-Effects

Preliminary studies in rats have found apoaequorin, the main ingredient in Prevagen, to be safe (Moran, Food Chem Toxicol 2013; Moran, Regul Toxicol Pharmicol 2014).

A low incidence of adverse events such as headache, nausea, constipation, edema and hypertension has been reported by the makers of Prevagen (FDA GRAS Notification 2014).

There are no known drug interactions, but the Prevagen website suggests "as with any new course of supplementation, you may want to talk with your doctor before beginning Prevagen use."

Prevagen Lawsuits

In January 2017 the Federal Trade Commission (FTC) charged Quincy Bioscience with making false and unsubstantiated claims, noting that the study noted above only found a benefit in a small subset of participants and only on certain measures of cognitive function. The agency stated in its complaint that "Given the sheer number of comparisons run and the fact that they were post hoc, the few positive findings on isolated tasks for small subgroups of the study population do not provide reliable evidence of a treatment effect." The suit was finally settled in 2020 with cash refunds to purchasers. The settlement allowed Quincy to continue marketing Prevagen provided it qualified its advertising claims with a court-approved disclaimer, as noted above. However, even the scaled-back claim and disclaimer has been criticized as “unreliable given that the analysis was not adjusted for multiple testing in accordance with good statistical practice.” (Degnan, FDLI 2021).

In March 2024, a jury verdict for another case brought against Prevagen by the state of New York (Federal Trade Commission et al v. Quincy Bioscience Holding Company, Inc. et al, Case #1:17-cv-00124) found that all eight statements challenged in the suit, including "Prevagen improves memory" and "Prevagen improves memory within 90 days," lacked support by "competent and reliable scientific evidence." Furthermore, the jury found two of the statements to be deceptive or materially misleading: These were that "Prevagen reduces memory problems associated with aging" and "Prevagen is clinically shown to reduce memory problems associated with aging."

FDA Warning Letter

In 2012, the FDA issued a warning to Quincy Bioscience because the company claimed Prevagen could treat conditions such as head injuries and Alzheimer's disease. The company also failed to report almost 1,000 adverse events associated with the product, including seizures, strokes, and heart arrhythmias. (Note: adverse events associated with the use of a product do not necessarily mean the adverse event was caused by the product.) In addition, the FDA warned Quincy that its unapproved and synthetic version of apoaequorin should be regulated and marketed as a drug, not as a supplement. According to anarticle in Isthmus, a Wisconsin newspaper, on February 5, 2013, Quincy's president claimed, "We've been able to satisfy all of their requests," referring to theFDA warning.

Counterfeit Prevagen

In November 2023, a lawsuit was filed by Quincy Bioscience, LLC and, Inc. against multiple parties based in Kenya for allegedly selling counterfeit Prevagen on during 2021 and 2022 under seller accounts including Walgreen Deals, Rite Aid Online, Mac Defense, and Milleys Malls. Authentic Prevagen appears to be sold on Amazon by “Prevagen Official Store.”

The Prevagen website states that Prevagen can be purchased from its official Amazon store, and that the company "cannot guarantee nor authenticate Prevagen bought from any other source on Amazon, Ebay, etc.." For more details and a list of verified sellers for Prevagen and other supplements, see ConsumerLab's article about how to avoid counterfeit supplements when shopping online.


The cost for a one-month supply of Prevagen varies depending on the formula: $39.95 for regular strength (10 mg) (the dose used in the studies above), $59.95 for "Extra Strength" Prevagen (20 mg) and $89.95 for "Professional Formula" Prevagen (40 mg), which does not appear to require a prescription or professional license to purchase.

+ 5 sources

In addition the results of its expert testing, ConsumerLab uses only high-quality, evidence based, information sources. These sources include peer-reviewed studies and information from agencies such as the FDA and USDA, and the National Academy of Medicine. On evolving topics, studies from pre-print journals may be sourced. All of our content is reviewed by medical doctors and doctoral-level experts in pharmacology, toxicology, and chemistry. We continually update and medically review our information to keep our content trustworthy, accurate, and reliable. The following sources are referenced in this article:

Does Prevagen Really Improve Memory? - (2024)
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