Phosphatidylserine is a phospholipid, a fatty substance produced in the body that helps transmit messages between nerve cells in the brain. It covers and protects brain cells, aids blood clotting, and may play a key role in retaining memory sharpness.

Phosphatidylserine exists naturally in certain foods and is sold as a dietary supplement. Studies in animals suggest that levels decline with age, and supplements may counteract this. Likewise, they may help with conditions such as:

Attention deficit-hyperactivity disorder (ADHD)
Alzheimer’s disease
Anxiety
Depression
Multiple sclerosis
Stress
In addition, phosphatidylserine supplements are purported to promote healthy sleep, improve mood, and enhance exercise performance.

This article discusses phosphatidylserine benefits, dosage, and possible side effects.

side effects of phosphatidylserine
Verywell / Gary Ferster
Health Benefits of Phosphatidylserine
A handful of studies have explored the health effects of phosphatidylserine supplements. However, most of the studies are small and dated.

May Boost Athletic Performance
Phosphatidylserine supplements may help increase exercise capacity and improve athletic performance. Researchers also found that phosphatidylserine may help decrease muscle soreness and protect against an increase in levels of cortisol, a stress hormone that often occurs as a result of overtraining.

May Improve Memory Loss
Phosphatidylserine is often taken to try to slow age-related memory loss. In a study published in the Journal of Clinical Biochemistry and Nutrition, 78 older people with mild cognitive impairment were assigned to six months of treatment with phosphatidylserine supplements or a placebo.

In tests performed at the end of the six-month period, participants who took phosphatidylserine were found to have experienced a significant improvement in memory.

May Ease Depression
Phosphatidylserine is thought to play a role in helping to regulate mood. In a 2015 study published in Mental Illness, for instance, people over the age of 65 with major depression took a supplement containing phosphatidylserine and the omega-3 fatty acids DHA and EPA three times daily for 12 weeks.4 At the study’s end, scores on a depression scale had improved.
More research is needed from large-scale, well-designed clinical studies before phosphatidylserine (or DHA) can be recommended for depression. This Mental Illness study, for example, cannot conclude whether phosphatidylserine, DHA, EPA, or the combination of supplements provides benefits.

May Treat ADHD Symptoms
Using phosphatidylserine in combination with omega-3 fatty acids may aid in the treatment of ADHD symptoms in children, suggests a 2012 study published in European Psychiatry.5 For the study, 200 children with ADHD were assigned to 15 weeks of treatment with either a placebo or a supplement containing phosphatidylserine and omega-3 fatty acids.

Study results revealed that participants treated with the combination of phosphatidylserine and omega-3 fatty acids experienced a significantly greater reduction in hyperactive/impulsive behavior and a greater improvement in mood compared to those given the placebo.

Another study published in 2014 compared phosphatidylserine to placebo in children who had been diagnosed with ADHD.6 After two months, the treatment group showed significant improvement in auditory memory, inattention, and impulsivity. This was a small study involving only 36 children. More and larger studies need to be performed to further assess safety and efficacy.

May Lower Cortisol Levels
Some studies have shown that phosphatidylserine supplementation reduces the body’s levels of cortisol7, a steroid hormone that the body produces in response to stress. Cortisol also plays a major role in regulating many of the body’s functions. High levels are associated with adverse health effects such as increased blood glucose and blood pressure, so keeping cortisol levels in check is beneficial.

What Is Cortisol?
Recap
Although research is limited, some evidence hints that phosphatidylserine may help improve exercise capacity, alleviate muscle soreness, protect memory, regulate mood, and improve symptoms of ADHD. However, further research is needed to explore these possible benefits.

Warnings and Contraindications of Phosphatidylserine
Phosphatidylserine may have a blood-thinning effect. If you take blood-thinning medication such as Coumadin (warfarin), take anti-inflammatory medication, or have blood-clotting problems, speak with your doctor before taking phosphatidylserine. Do not take it within two weeks of scheduled surgery.

Phosphatidylserine supplements may also interact with medications used to treat glaucoma, Alzheimer’s disease, antihistamines, and antidepressants. Because additional potential interactions with many medications have not been tested, iask your doctor before using phosphatidylserine.

Supplements haven’t been tested for safety and due to the fact that dietary supplements are largely unregulated, the content of some products may differ from what’s specified on the product label.

The safety of supplements in people who are pregnant or breastfeeding, children, and those with medical conditions or who are taking medications has not been established.