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Phosphatidylserine – The Brain Fat for Memory, Focus, and Stress Resilience
Phosphatidylserine (PS) is a phospholipid predominantly found in brain cell membranes, making up 15% of the total phospholipids in the brain. It is the only supplement with an FDA-qualified health claim for cognitive function and is considered one of the most well-researched nootropics available.
Physiological Function in the Brain
- Cell Membrane Integrity: PS provides structural support for neuron membranes – influencing fluidity and signal transmission efficiency.
- Neurotransmitter Release: Acetylcholine, dopamine, and serotonin release are PS-dependent.
- Glucose Uptake: PS improves glucose utilization in the brain (the most important energy substrate).
- Cortisol Modulation: Reduces excessive cortisol release during stress (HPA dampening).
- Neural Plasticity: Supports the growth and repair of nerve cell extensions (neurites).
- Apoptosis Signal: PS flips to the outer membrane as an "eat-me" signal for immune cells (phagocytosis).
FDA Health Claim
The FDA allows the following qualified health claim (2003): "Phosphatidylserine may reduce the risk of cognitive dysfunction in the elderly." One of the few such recognitions for a supplement.
Clinical Evidence
| Area of Application | Effect | Dose | Evidence |
|---|---|---|---|
| Memory (elderly) | Improved short- and long-term memory, slowed cognitive decline | 300 mg/day | Very well documented |
| ADHD in children | Reduced hyperactivity, improved attention | 200–300 mg/day | Well documented |
| Stress resilience / Cortisol | Cortisol peak after exercise reduced by 30% | 400–800 mg/day | Well documented |
| Sports cognition | Improved reaction time and accuracy after training | 400 mg/day | Moderate |
| Alzheimer's (early) | Slowed progression, improved cognitive scores | 300 mg/day | Moderate |
PS Sources: Soy vs. Sunflower vs. Bovine Brain
| Source | PS Content | Bioavailability | Status |
|---|---|---|---|
| Bovine brain extract (bovine PS) | Very high | Highest | No longer approved (BSE risk) |
| Soy lecithin PS | Well standardizable | Good | Standard in supplements |
| Sunflower PS | Well standardizable | Good | Preferred (soy-free, low allergen) |
Dosage
- Cognition / Memory: 300 mg/day (3× 100 mg with meals)
- Stress Resilience / Sport: 400–800 mg/day
- ADHD: 200–300 mg/day
- Intake: With meals (fat-soluble phospholipid); can be taken in the evening (promotes sleep by lowering cortisol)
- Onset of Action: Usually after 4–8 weeks of regular intake
Frequently Asked Questions (FAQ)
Can I get phosphatidylserine from food?
Phosphatidylserine-rich foods: Beef brain (~713 mg/100g – rarely eaten today), tuna (~194 mg/100g), chicken liver (~123 mg/100g), white beans (~107 mg/100g). For therapeutic doses, supplements are necessary.
PS and Alzheimer's – can it cure the disease?
No – PS can slow cognitive decline and improve cognitive functions in early stages. It is not a cure for Alzheimer's and does not replace medical treatment.
