Phosphatidylserine Explained Simply

1. What It Is About

Phosphatidylserine is a building block of the membrane that surrounds every cell. This membrane is called the cell membrane. The building block is mainly located on the inner side of this membrane and helps transmit signals from outside into the cell. It is found in all animal and plant cells. Natural sources include soy, sunflower seeds, and animal tissues such as brain or liver. For dietary supplements, it is usually extracted from soy or sunflower lecithin; lecithin is a fat-like substance derived from plants.

An important point for understanding the studies: Phosphatidylserine is rarely tested on its own. Participants often receive it in combination with omega-3 fatty acids or phosphatidic acid. Omega-3 fatty acids are fats from fish and plant oils, while phosphatidic acid is another building block of the cell membrane. If a combination shows an effect, it cannot later be determined which component made the difference. Additionally, most studies do not measure direct levels of the substance in the blood or tissues because it is rapidly metabolised. Instead, studies rely on memory tests or observations in daily life.

2. What Studies Show

Showed: In a 2014 study, 36 children aged 4 to 14 with ADHD received soy-derived phosphatidylserine for two months. At the end, ADHD symptoms, attention problems, and restlessness were reduced in the group receiving the substance compared to before; the placebo group showed no change. Short-term auditory memory also improved. A placebo is a sham treatment without an active ingredient 4.

Showed: A second study from 2010 followed 157 older adults with subjective memory complaints over 15 weeks. Participants received phosphatidylserine combined with omega-3 fatty acids or a placebo. The analysis showed that those with initially better memory performance were better able to recall information and retain learned material 2.

Showed: In 2014, 84 older adults with Alzheimer’s dementia were given a complex of phosphatidylserine and phosphatidic acid over two months. In the placebo group, everyday activities such as dressing or eating deteriorated over time, whereas in the group receiving the complex, these abilities remained stable 3.

Plausible In a small 2016 study, 15 postmenopausal women aged 60 to 84 received a multi-ingredient preparation containing phosphatidylserine for six months; 12 others received a placebo. The women taking the preparation showed faster reaction times in a movement test, improved word recall, and a higher habitual walking speed 1. Since the preparation contained multiple ingredients, the effect cannot be attributed solely to phosphatidylserine.

Hypothesis There are older studies from 1990 and 1992 involving healthy men that suggest phosphatidylserine may attenuate the physical stress response after exertion 56. A later 2012 study found improvements in men with chronic high stress who took omega-3 fatty acids in phosphatidylserine; the effect of phosphatidylserine alone is not yet known 7. A 2013 study examined tolerability in children who received the substance alongside omega-3 fatty acids over a short period 8. All these findings are preliminary and not yet conclusive.

3. What Remains Unclear

Almost all human studies test phosphatidylserine in combination with other substances. Whether the substance alone has any effect remains unanswered. It is also unclear how much of it actually reaches the brain; most studies do not measure levels in the nervous system. Long-term observations and larger participant groups are lacking. Results in Alzheimer’s dementia are inconsistent. There is little reliable evidence regarding cardiovascular diseases or antioxidant effects; antioxidant refers to the ability to neutralise aggressive particles in the body. Whether the observed effects truly relate to memory or are mediated by reduced stress responses is another open question. The key question for future research is whether larger studies using pure phosphatidylserine in various formulations can confirm these findings.

4. What This Means in Everyday Life

When reviewing the scientific evidence, one encounters many small studies involving different groups: children with ADHD, older adults with memory complaints, people with Alzheimer’s dementia, and men under stress. The results point in a similar direction but were almost always tested in combination with other substances. Whether phosphatidylserine alone has any effect cannot be concluded from these findings. Observed outcomes include performance in test tasks, daily activities, and stress responses—not overall disease progression. Comparing the studies also reveals that each group was narrowly defined, such as older adults with mild symptoms. The next step is to clarify whether pure phosphatidylserine, taken over a longer period, has any effect in clearly defined groups and which measurable changes occur in the nervous system.

All details with study numbers and sources: detailed page on phosphatidylserine. For children: Phosphatidylserine for children.