What Is Phosphatidylserine, and Why Does the FDA Limit Its Memory Claim?

What the sources let us say about the first ingredient on Memopryl's list.

• Phosphatidylserine sits in the wall of every cell, and brain cells hold a lot of it.
• Supplements are often made from soy, and the trials used soy-derived phosphatidylserine.
• One trial gave 78 adults aged 50 to 69 with memory complaints 100 or 300 mg a day for 6 months.
• A smaller pilot gave 30 older adults 300 mg a day for 12 weeks, with no placebo group.
• The FDA lets sellers make a memory claim for it only with wording that admits the evidence is very limited.
• The Memopryl amount and the source of its phosphatidylserine are not published.
• No dietary supplement is FDA approved, and that includes Memopryl.

Phosphatidylserine is a fat-like molecule. It is part of the wall that wraps every cell in the body, and brain cells carry plenty of it. The brand's own graphic describes it as a phospholipid found in cell membranes.

Supplements are often made from soy. It is the first of the six named ingredients in the Memopryl formula, which is why it is worth a closer look in any Memopryl supplement review.

The sources we hold report no side effects for it. That is a gap in the sources and not an all-clear, so the usual medicine check still applies to the capsule as a whole.

Two studies carry the story. The larger one, by Kato-Kataoka and colleagues in 2010 (Kato-Kataoka et al., 2010), tested soy phosphatidylserine in Japanese adults who had memory complaints. The smaller one, by Richter and colleagues in 2013 (Richter et al., 2013), was a pilot.

A pilot with no placebo group carries less weight. People can improve over twelve weeks for many reasons, and without a comparison group you cannot tell which reason it was.

In 2003 the FDA wrote letters about a possible phosphatidylserine and memory claim (FDA, qualified health claims). It said a seller may use the claim only with strong qualifying words. The words say that research is very limited and preliminary, and that there is very little scientific evidence for the claim.

That is called a qualified health claim, and it is a weak form of permission. It is not an approval of the ingredient or of any product that contains it. The FDA does not approve dietary supplements before they are sold (FDA, Q&A on Dietary Supplements).

So, is Memopryl FDA approved? No. Memopryl's bottle does not make a phosphatidylserine claim at all. The front carries three support lines about concentration, brain energy and productivity, each with an asterisk that points to the standard FDA statement.

Not directly. Both trials enrolled older adults who already had memory complaints. Memopryl is sold for healthy adults aged 18 and over who want focus support, and that is a different group.

Among Memopryl's six ingredients, only bacopa has a placebo-controlled result in healthy adults. Phosphatidylserine sits in the middle. It has a real trial, but not in busy workers.

Phrases such as memopryl brain health and memopryl cognitive support are search words, not label claims. There is one more detail worth keeping in mind. The gain in the larger trial was biggest in people who began with lower scores. Someone who starts with a strong memory may have less room to improve.

The trials used soy-derived phosphatidylserine. Which source Memopryl uses is not published in the material we hold. Do not guess.

Nobody outside the brand can say, because the amount is not published. The table puts the trial next to what we know about the capsule.

Read your own panel on arrival and write the number next to this table. If the line shows a blend total instead of single amounts, you will not be able to separate phosphatidylserine from the rest, and that is worth telling your pharmacist.

The studies ran from 12 weeks to 6 months. The refund window is 60 days, and shipping days count inside it. So a Memopryl trial cannot copy a phosphatidylserine trial.

What you can do is keep a plain log. Rate your focus once a week, note your sleep and your coffee, and look for a trend and not a single good day. Buyers in the retailer's pack most often mention 3-4 weeks. The retailer supplied that figure, and it is not independently verified.

If memory changes are what worry you, a log is the wrong tool. The National Institute on Aging advises talking with a doctor about noticeable changes (NIA, memory and aging).

Our view: phosphatidylserine is a plausible ingredient with a thin evidence trail. The trials were real, but they were in older adults with memory complaints, and the FDA itself asks sellers to say how little is known. That should lower expectations a notch, not remove it from the formula.

What would raise our confidence is simple: a published panel with the amount and the source. Until then, the useful step is to read your bottle, write the number down and show it to a pharmacist.

This is general information and not medical advice. Memopryl is not FDA approved, and no supplement is. It does not treat, cure or prevent any disease. If you or someone close to you has noticeable memory changes, see a doctor first.

Last updated October 16, 2026.