Phosphatidylserine

Medically reviewed by Prof. Giorgi Pkhakadze, MD, MPH, PhD — GMJ Editorial Board

What is Phosphatidylserine?

Phosphatidylserine (PS) is a phospholipid compound that plays a crucial role in cellular function, particularly in brain cells. It is a naturally occurring component of cell membranes, with the highest concentrations found in brain tissue. As an essential structural component of neural membranes, phosphatidylserine helps maintain cell membrane fluidity and supports various cellular processes including neurotransmitter release and cell signaling.

While the human body can produce small amounts of phosphatidylserine, production typically declines with age. Originally derived from bovine brain tissue, commercial supplements now primarily use soy-derived or sunflower-derived phosphatidylserine due to safety concerns. The compound has gained attention as a nootropic supplement, marketed primarily for cognitive support and brain health.

Health benefits & uses

Cognitive function and memory (Moderate evidence): Multiple studies suggest phosphatidylserine may help improve memory, attention, and cognitive processing in both aging adults and younger individuals. Clinical trials have shown modest improvements in memory tasks and cognitive test scores, particularly in older adults experiencing age-related cognitive decline.

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Exercise performance and recovery (Limited evidence): Some research indicates phosphatidylserine supplementation may help reduce exercise-induced stress and improve recovery. Studies have examined its effects on cortisol levels following intense physical activity, with mixed but generally positive results.

Stress response (Limited evidence): Preliminary research suggests phosphatidylserine may help modulate the body’s stress response by potentially reducing cortisol levels and supporting healthy stress adaptation, though more research is needed to confirm these effects.

ADHD symptoms (Limited evidence): Small-scale studies have investigated phosphatidylserine’s potential benefits for attention deficit hyperactivity disorder symptoms in children, showing some promise but requiring larger, more robust trials for confirmation.

How it works

Phosphatidylserine functions primarily through its role in maintaining cellular membrane integrity and facilitating cellular communication. In brain cells, it supports the fluidity and stability of neuronal membranes, which is essential for proper neurotransmitter function and signal transmission between neurons.

The compound influences several key mechanisms: it helps maintain optimal membrane composition for neurotransmitter release, supports the activity of membrane-bound enzymes, and may influence the production of acetylcholine, a neurotransmitter important for memory and learning. Additionally, phosphatidylserine appears to support the hypothalamic-pituitary-adrenal axis, potentially helping to regulate cortisol production and stress response.

As people age, natural phosphatidylserine levels in brain tissue tend to decrease, which may contribute to age-related cognitive changes. Supplementation aims to restore optimal levels and support continued neuronal function.

Dosage

There is no established Recommended Daily Allowance (RDA) or Upper Limit (UL) for phosphatidylserine. Typical dosing ranges used in clinical studies and recommended by manufacturers include:

Adults: 100-300 mg daily, usually divided into 2-3 doses taken with meals. Most cognitive studies have used doses between 100-400 mg daily for periods ranging from 6 weeks to 6 months.

Timing: Generally taken with meals to improve absorption and reduce potential gastrointestinal upset. Some practitioners recommend taking the largest dose in the evening, as phosphatidylserine may support relaxation and sleep quality.

Individual needs may vary significantly, and consultation with a healthcare provider is recommended before starting supplementation, especially for those with existing health conditions or those taking medications.

Food sources

Natural dietary sources of phosphatidylserine include:

• Animal products: Brain tissue (highest concentration), organ meats, fish (mackerel, herring, tuna), chicken, and beef
• Dairy: Milk, cheese, and yogurt in smaller amounts
• Plant sources: Soybeans and soy products, sunflower lecithin, white beans, and rice
• Other sources: Egg yolks and some nuts and seeds

However, typical dietary intake from food sources is relatively low (estimated at 2-10 mg daily), making it difficult to achieve the higher amounts used in therapeutic studies through diet alone.

Safety & side effects

Phosphatidylserine is generally well-tolerated by most people when used at recommended doses. Reported side effects are typically mild and may include:

• Gastrointestinal upset, including nausea or stomach discomfort
• Insomnia or sleep disturbances (particularly if taken late in the day)
• Headache (rare)
• Dizziness (rare)

Long-term safety data is limited, though studies lasting up to 6 months have not reported significant adverse effects. Soy-derived and sunflower-derived phosphatidylserine are considered safer than the original bovine-derived forms, which were discontinued due to concerns about transmissible spongiform encephalopathies.

Interactions

Medications: Phosphatidylserine may potentially interact with anticoagulant medications (blood thinners) as it might affect blood clotting. Individuals taking warfarin, heparin, or other anticoagulants should consult their healthcare provider before use.

Other supplements: Generally considered safe to combine with most supplements. However, those taking multiple nootropics or cognitive enhancers should monitor for cumulative effects and discuss combinations with a healthcare provider.

Cholinesterase inhibitors: Theoretical interactions may exist with medications used for Alzheimer’s disease, as phosphatidylserine may influence acetylcholine levels.

Who should be cautious

Specific populations should exercise caution or avoid phosphatidylserine supplementation:

• Pregnant and nursing women: Safety data is insufficient; supplementation is not recommended
• Children: Limited safety data available; use only under healthcare provider guidance
• People with soy allergies: Should avoid soy-derived phosphatidylserine and opt for sunflower-derived forms
• Those on blood-thinning medications: Require medical supervision due to potential interaction risks
• Individuals with bleeding disorders: Should consult healthcare providers before use

Frequently asked questions

How long does it take to see effects from phosphatidylserine?

Most studies show cognitive benefits emerging after 6-12 weeks of consistent use. Some individuals may notice subtle improvements in memory or focus within 2-4 weeks, while others may require longer periods. Effects on exercise recovery and stress may be more immediate, potentially noticeable within days to weeks.

Should I take phosphatidylserine with or without food?

Taking phosphatidylserine with meals is generally recommended to improve absorption and reduce the likelihood of gastrointestinal upset. The fat content in meals may help enhance the absorption of this fat-soluble compound.

Is soy-derived or sunflower-derived phosphatidylserine better?

Both forms appear to be equally effective and safe. The choice often depends on individual allergies or sensitivities. Sunflower-derived phosphatidylserine is preferred for those with soy allergies, while soy-derived forms have been more extensively studied in clinical trials.

Can I take phosphatidylserine if I’m vegetarian or vegan?

Yes, both soy-derived and sunflower-derived phosphatidylserine supplements are suitable for vegetarians and vegans, as they don’t contain animal products. Always verify the supplement source and check for other ingredients that might not align with dietary preferences.

Will phosphatidylserine help with sleep?

Some people report improved sleep quality when taking phosphatidylserine, possibly due to its effects on stress hormones like cortisol. However, timing matters – while some find evening doses helpful for relaxation, others may experience mild stimulation. Individual responses vary considerably.