Several supplements, vitamins, and dietary strategies have clinical evidence supporting their ability to improve short-term memory. The right approach depends on what’s behind your memory problems. A nutrient deficiency, poor sleep, or chronic stress each calls for a different solution, and sometimes the most effective “thing to take” isn’t a pill at all. Here’s what the evidence actually supports.
Rule Out a Vitamin B12 Deficiency First
Before spending money on specialty supplements, check the basics. Vitamin B12 deficiency is one of the most common and most treatable causes of memory problems, especially in adults over 50. Your body needs B12 to maintain the protective coating around nerve cells, and when levels drop low enough, short-term memory, concentration, and processing speed all suffer.
Deficiency is typically defined as blood levels below 150 pmol/L, though some researchers use thresholds as high as 350 pmol/L. People at highest risk include vegetarians and vegans (B12 comes almost exclusively from animal foods), adults over 60 (who absorb it less efficiently), and anyone taking long-term acid-reducing medications. A simple blood test can identify the problem, and supplementation or dietary changes can reverse memory symptoms when B12 is the underlying cause.
DHA Omega-3 Fatty Acids
DHA, a type of omega-3 fat concentrated in fish and algae oil, is the most structurally important fatty acid in the brain. It makes up a large portion of neuronal cell membranes and plays a direct role in how brain cells communicate. In clinical research, 900 mg per day of DHA taken over 24 weeks improved learning and memory performance, particularly in older adults experiencing age-related cognitive decline.
You can get DHA from fatty fish like salmon, mackerel, and sardines, or from fish oil and algae-based supplements. If you’re supplementing, look for the DHA content specifically, not just total fish oil. Many capsules contain more EPA (a related omega-3 that’s more anti-inflammatory than brain-specific) than DHA, so read the label carefully.
Bacopa Monnieri
Bacopa monnieri is an herb used in traditional Indian medicine that has accumulated a surprisingly strong evidence base for memory. In a study of healthy older adults, a standardized extract at 300 mg per day significantly improved both the continuity of attention and quality of memory after just four weeks compared to placebo. A higher dose of 600 mg per day improved the speed of memory recall on the same timeline.
Bacopa works in part by supporting the brain’s chemical signaling systems involved in learning and recall. It’s widely available as a supplement, but patience matters. Most studies run 8 to 12 weeks, and the benefits tend to build gradually rather than appearing overnight. Some people experience mild stomach upset, so taking it with food helps.
Magnesium L-Threonate
Most magnesium supplements don’t meaningfully raise magnesium levels in the brain because they can’t easily cross the blood-brain barrier. Magnesium L-threonate is different. Developed by researchers at MIT, this specific form was shown to increase magnesium concentrations in cerebrospinal fluid by 7% to 15% within 24 days in animal studies, while other common forms (citrate, glycinate, chloride, gluconate) could not.
In a double-blind, placebo-controlled trial of 109 healthy adults aged 18 to 65, a formula built around magnesium L-threonate produced significant improvements across all five subcategories of a clinical memory test, as well as in overall memory quotient scores. Older participants saw the largest gains. If you’re already low in magnesium (and many people are, since modern diets tend to be magnesium-poor), this form is worth considering specifically for cognitive benefits.
Phosphatidylserine
Phosphatidylserine is a fat-like molecule that forms a critical part of every cell membrane in your body, with especially high concentrations in the brain. It helps brain cells transmit signals efficiently and supports the formation and retrieval of memories. Supplemental doses typically range from 100 to 500 mg per day, and it’s commercially available as an oral supplement specifically marketed for cognitive function.
It’s worth noting that the magnesium L-threonate study mentioned above combined its formula with phosphatidylserine, so these two may work well together. Phosphatidylserine is also found naturally in organ meats, soybeans, and egg yolks, though dietary amounts are relatively small.
Huperzine A
Huperzine A is a compound extracted from Chinese club moss that works by blocking the enzyme that breaks down acetylcholine, one of the brain’s key memory-related chemical messengers. This is the same basic mechanism used by several prescription medications for cognitive decline, but huperzine A is available over the counter as a supplement.
Research shows it’s a potent and selective inhibitor of that enzyme, outperforming several prescription alternatives in lab comparisons. A phase II clinical trial in the United States found that participants with mild to moderate cognitive impairment who took 400 micrograms twice daily showed significant improvement in cognitive function compared to placebo. Lower doses in the range of 150 to 250 micrograms twice daily are used clinically in China. Because it affects the same brain pathway as prescription memory drugs, don’t combine it with those medications without medical guidance.
Ginkgo Biloba: A Caution
Ginkgo biloba is one of the most popular supplements marketed for memory, but its evidence is mixed and it carries a notable safety concern. Ginkgo reduces platelet aggregation, which means it can increase bleeding risk. In a large study of veterans, taking ginkgo alongside the blood thinner warfarin raised the risk of a bleeding event by 38%. If you take any anticoagulant or antiplatelet medication, including aspirin, ginkgo is not a safe choice. Even without blood thinners, it can cause issues before surgical procedures.
The MIND Diet for Long-Term Protection
What you eat daily may matter more than any single supplement. The MIND diet, developed specifically to protect brain function, combines elements of the Mediterranean and DASH diets with an emphasis on foods linked to cognitive health. People with the highest adherence to the MIND diet had a 53% lower rate of Alzheimer’s disease in cohort research from Harvard and Rush University.
The framework is straightforward:
- Daily: 3+ servings of whole grains, 1+ servings of vegetables, and olive oil as your primary cooking fat
- 6+ times per week: green leafy vegetables like spinach, kale, or salad greens
- Most weeks: 5+ servings of nuts, 4+ meals with beans, 2+ servings of berries, 2+ meals with poultry, and at least 1 serving of fish
Berries and leafy greens are the standout categories. The diet also limits red meat, butter, cheese, pastries, and fried food. You don’t need to follow it perfectly. Even moderate adherence was associated with meaningful cognitive protection in the research.
When Memory Loss Needs More Than Supplements
Occasional forgetfulness, like misplacing your keys or blanking on a name, is normal at any age. But if memory problems are interfering with daily tasks, getting worse over time, or being noticed by people around you, a formal screening can clarify what’s going on. The Montreal Cognitive Assessment is a widely used 30-point test that detects mild cognitive impairment with about 90% sensitivity, far better than older screening tools. A score below 26 generally flags the need for further evaluation.
Mild cognitive impairment is not dementia, and not everyone with it progresses. But identifying it early opens the door to interventions, including the supplements above, lifestyle changes, and in some cases prescription treatments, that work best when started sooner rather than later. Sleep quality, physical exercise, stress management, and social engagement all have strong independent effects on memory that no supplement can fully replace.