Phosphatidylserine for Dementia Prevention: Does It Actually Work?

One of the most widely cited studies on phosphatidylserine involved people experiencing age-related cognitive decline. After taking the supplement for 6 to 12 weeks, participants showed a modest improvement in facial recognition compared to a placebo group. This study put phosphatidylserine on the map — but what most people don't know is what happened after the headlines.

Phosphatidylserine supplements typically cost around $18 per month — less than $0.60 a day. If that could actually prevent dementia, it would seem like a no-brainer. But before you reach for your wallet, let's take a closer look at what the research really shows, why the two most-cited studies have serious flaws, and what actually works for brain health.

The Two Studies Behind the Hype — And Their Problems

Study #1: Dr. Crook's 1990s Research

Phosphatidylserine first gained widespread attention in the early 1990s through research published by Dr. Thomas Crook. The findings suggested that 6 to 12 weeks of supplementation improved facial recognition in people with age-related cognitive decline. The supplement market ran with it — some marketers claimed it could make your memory "10 years younger."

But there are two major problems with this study:

Problem 1 — Practice effect: The placebo group's scores also improved over time, simply from repeated exposure to the same tests. The gap between the supplement group and the placebo group wasn't particularly striking, suggesting the improvement may have been a learning effect rather than a true cognitive benefit.

Problem 2 — Different raw material: That study used phosphatidylserine extracted from bovine (cow) brain tissue. Bovine-derived phosphatidylserine naturally contains DHA — a fatty acid that plays a critical role in brain function — chemically bonded to it. Today's phosphatidylserine supplements are almost entirely soy-derived. Without the DHA component, expecting the same results from a plant-based product is a stretch.

Study #2: Tel Aviv University Research (Early 2000s)

Because the original bovine-based study no longer applies to modern products, supplement companies have shifted to citing research from Tel Aviv University, published in the early 2000s. This study reported improvements in learning ability, name-face association, and facial recognition after 12 weeks of taking 300 mg per day of soy-derived phosphatidylserine.

The catch? This study had no control group. Without a placebo comparison, it's impossible to tell whether improvements came from the supplement or simply from participants becoming more familiar with the tests over time. Even more notably, the study enrolled only 15 participants — a detail that rarely makes it onto product pages.

What Regulatory Bodies Say

The U.S. Food and Drug Administration (FDA) has concluded that there is no credible scientific evidence that phosphatidylserine prevents dementia. The Alzheimer's Association goes further, explicitly stating that it does not recommend phosphatidylserine supplementation.

Can You Get Enough from Food?

The typical supplemental dose is 300 mg per day. The average American already consumes roughly 228 mg per day through diet. A 3.5 oz (100 g) serving of mackerel provides about 480 mg, and herring provides around 360 mg — both well above the supplement dose. If you regularly eat fish or other animal-based foods, additional supplementation is likely unnecessary.

Bottom line: phosphatidylserine isn't completely useless, but the evidence for supplementation is too weak to justify the cost.

If You're Already Taking Phosphatidylserine

If you're currently taking a phosphatidylserine supplement and want to make the most of it, here are two practical tips:

Take it with fat: Phosphatidylserine is fat-soluble. Taking it on an empty stomach can significantly reduce absorption. Always take it immediately after a meal that contains dietary fat.

Pair it with B vitamins: Your body needs vitamin B12, vitamin B6, and folate to metabolize phospholipids and produce neurotransmitters. Without these, even high-quality phospholipids may not be fully utilized by the brain.

Better Alternatives for Brain Health

1. High-Dose Omega-3 (DHA-Focused)

If phosphatidylserine forms the structural framework of brain cell membranes, omega-3 fatty acids — particularly DHA — keep those membranes fluid and allow signals to travel efficiently. South Korea's Ministry of Food and Drug Safety (MFDS) recognizes omega-3's role in memory improvement, though at a minimum combined EPA + DHA dose of 900 mg per day.

For stronger results, aim for 900 mg of DHA specifically, not just a combined total. One of the most cited studies on omega-3 and memory — referenced over 800 times in the scientific literature — enrolled 485 adults aged 55 and older with mild cognitive decline. After six months of 900 mg/day of DHA, participants showed measurable memory improvements. Higher blood levels of DHA consistently corresponded with fewer errors on memory tests. The placebo group showed no such benefit.

Compare that to the phosphatidylserine study with 15 participants and no control group — the contrast in study quality is significant.

How to choose an omega-3 supplement: Most products list combined EPA + DHA, not each separately. EPA is typically present in higher amounts than DHA — often in a roughly 2:1 ratio. If a label says 900 mg total, that might be 600 mg EPA and only 300 mg DHA. For memory support, choose products with the highest total EPA + DHA content and take two capsules per day (morning and evening) to get closer to a DHA-focused 900 mg dose. Look for products with IFOS certification and from reputable manufacturers.

2. Aerobic Exercise

This is the most powerful, evidence-backed intervention for brain health — more effective than any supplement currently on the market.

Aerobic exercise immediately increases blood flow to the brain and triggers the release of brain-derived neurotrophic factor (BDNF) — a protein that supports the growth and maintenance of neurons. This isn't something you swallow and hope reaches your brain; it's something your body produces itself in direct response to physical movement.

The landmark study on exercise and brain volume was published in 2011 by researchers at the University of Pittsburgh, led by Dr. Kirk Erickson. It enrolled 120 adults between the ages of 60 and 80 and has been cited over 6,800 times. One group walked briskly for 40 minutes, three times per week, for one year. A control group did only light stretching.

After one year, MRI scans showed that the aerobic exercise group had a 2% increase in hippocampal volume — the region of the brain central to memory. Normally, the hippocampus shrinks by 1 to 2% annually with age. This means that walking alone effectively reversed 1 to 2 years of age-related brain shrinkage. The stretching group continued to show hippocampal decline.

Three brisk 40-minute walks per week is one of the most well-supported dementia prevention strategies in existence.

Summary: What to Do Instead

Phosphatidylserine is a component your brain genuinely needs — but the scientific evidence that taking it as a supplement meaningfully improves cognition is very thin. Here's a practical, evidence-based approach:

If you want a supplement for brain health, choose high-dose omega-3 with attention to DHA content rather than phosphatidylserine. Aim for at least 900 mg DHA per day.

For dietary phosphatidylserine, eat fatty fish like mackerel once or twice a week. You'll get more phosphatidylserine — along with DHA — than any capsule can provide, and in a form your body knows how to use.

For brain health overall, walk briskly for 40 minutes, three times a week. This is the single most validated intervention for preserving and even growing brain volume as you age. No supplement comes close.

Before spending money on a supplement backed by a 15-person study with no control group, consider investing that time and energy into the habits that have the strongest evidence behind them.