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Published on: 9/17/2026
Yes, Prevagen can cause side effects in adults over 60, though reported reactions are usually mild and uncommon. Users and adverse event reports have described headaches, dizziness, nausea, upset stomach, diarrhea, chest discomfort, tremors, and sleep changes, and older adults may be more sensitive because of slower metabolism, existing conditions, or interactions with prescription medications. Because the active ingredient, apoaequorin, is a protein, allergic reactions are also possible, and Prevagen's memory benefits remain scientifically unproven. If new symptoms such as confusion, palpitations, or persistent digestive upset appear after starting any supplement, they may signal something unrelated that deserves attention. There are several important factors to consider, including who should avoid it entirely, so review the complete details below before continuing or stopping use.
If you are over 60 and noticing symptoms like memory changes, dizziness, headaches, or stomach trouble, guessing whether a supplement is the cause can delay finding the real explanation. A free, instant, online symptom check asks about your symptoms, age, and health history, then helps you understand possible causes and what type of care makes sense next. It takes only a few minutes, requires no appointment, and can give you clearer questions to bring to your doctor or pharmacist.
Last reviewed for medical accuracy: 09/17/2026
As we age, it’s natural to look for ways to support memory and cognitive health. Prevagen is one of the most talked-about supplements on the market, marketed for its potential to improve memory in older adults. But if you’re over 60, you may wonder: does Prevagen have side effects? Below, we break down what the research and credible health authorities say, in clear, straightforward language.
Prevagen is an over-the-counter dietary supplement that contains apoaequorin, a protein originally sourced from jellyfish. The manufacturer claims it helps maintain or improve memory function in people 40 and older. Although small clinical trials have been conducted, regulatory bodies have raised questions about the strength of the evidence behind these claims.
Key points about Prevagen:
While many users report no issues, some people may experience mild to moderate side effects. In most cases, these are temporary and resolve once the supplement is stopped. Reports include:
These symptoms are generally uncommon and mild. If you notice any of these effects after starting Prevagen, you might consider pausing the supplement for a few days to see if they improve.
Serious side effects are rare, but it’s important to be aware of the possibilities, especially for those over 60 who may have other health conditions or take multiple medications. Watch for:
If you experience any of these serious symptoms, stop taking Prevagen immediately and seek medical attention. Always err on the side of caution when your health is involved.
Adults over 60 often have unique health factors that can influence how any supplement affects them:
Multiple Medications:
Chronic Conditions:
Nutritional Status:
Immune System Changes:
Though marketed heavily on TV and online, Prevagen remains a supplement with limited high-quality evidence behind its claims. That doesn’t mean it’s unsafe for everyone—just that you should proceed thoughtfully.
If you and your healthcare provider decide Prevagen might be worth a try, consider these practical steps:
You may want to pause or stop taking Prevagen if you notice:
If side effects are mild and temporary, some people choose to continue while monitoring carefully. If they persist or worsen, it’s best to discontinue use and check in with a healthcare professional.
Not sure whether your symptoms warrant a doctor’s visit? You might consider doing a free, online symptom check, using the doctor approved Ubie Symptom Checker. It’s a quick way to assess what might be going on and get guidance on next steps.
Prevagen is widely used by people over 60 seeking memory support. While many tolerate it well, a subset of users report side effects ranging from mild (headache, nausea) to rare but serious (allergic reactions, severe dizziness). Current research is limited, and regulatory bodies caution against overstated claims.
Before starting Prevagen—or any supplement—consider the following:
If you decide to try Prevagen, monitor your response closely. And remember, for any symptom that could be serious or life-threatening, speak to a doctor right away.
Speak to a doctor if you experience severe or worrying symptoms. Your health—especially after 60—deserves professional attention and personalized care.
(References)
* Hersant H, He S, Maliha P, Grossberg G. Over the Counter Supplements for Memory: A Review of Available Evidence. CNS Drugs. 2023 Sep;37(9):797-817. doi: 10.1007/s40263-023-01031-6. Epub 2023 Aug 21. PMID: 37603263.
* Drugs for dementia. Med Lett Drugs Ther. 2026 Mar 30;68(1751):49-56. doi: 10.58347/tml.2026.1751a. PMID: 41874248.
* Grossman S, Nathan JP, Siuzdak A, Liang J, Sprycha C. Prevagen(®): Analysis of Clinical Evidence and Its Designation as a "#1 Pharmacist Recommended Brand". Sr Care Pharm. 2022 Aug 1;37(8):335-338. doi: 10.4140/TCP.n.2022.335. PMID: 35879840.
* Drugs for cognitive loss and dementia. Med Lett Drugs Ther. 2022 Aug 22;64(1657):129-136. PMID: 35984642.
* Apoaequorin (Prevagen) to improve memory. Med Lett Drugs Ther. 2021 Nov 1;63(1636):175-176. PMID: 35085208.
* Hickson SV, Darnell LK. Enhancing Cognitive Function with Herbal Supplements. Nurs Clin North Am. 2021 Mar;56(1):59-67. doi: 10.1016/j.cnur.2020.10.005. Epub 2020 Dec 29. PMID: 33549286.
* Spence J, Chintapenta M, Kwon HI, Blaszczyk AT. A Brief Review of Three Common Supplements Used in Alzheimer's Disease. Consult Pharm. 2017 Jul 1;32(7):412-414. doi: 10.4140/TCP.n.2017.412. PMID: 28701253.
* Moran DL, Tetteh AO, Goodman RE, Underwood MY. Safety assessment of the calcium-binding protein, apoaequorin, expressed by Escherichia coli. Regul Toxicol Pharmacol. 2014 Jul;69(2):243-9. doi: 10.1016/j.yrtph.2014.04.004. Epub 2014 Apr 24. PMID: 24768935.
* Litwin SE, Vatner DE, Morgan JP. Inotropic effects of alpha 1-adrenergic agonists in myocardium from rats with postinfarction heart failure. Am J Physiol. 1995 Nov;269(5 Pt 2):H1553-63. doi: 10.1152/ajpheart.1995.269.5.H1553. PMID: 7503248.
* Chen W, Xu J, Chen J, Wang JF, Zhang S, Pei ZM. Acidic Stress Induces Cytosolic Free Calcium Oscillation, and an Appropriate Low pH Helps Maintain the Circadian Clock in Arabidopsis. Plants (Basel). 2024 Nov 4;13(21). doi: 10.3390/plants13213107. Epub 2024 Nov 4. PMID: 39520026; PMCID: PMC11548685.
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