What Is Phosphatidylserine?
Phosphatidylserine (PS) is a phospholipid that forms a critical component of every cell membrane, with the highest concentrations in neuronal membranes. It is particularly concentrated in the inner leaflet of the plasma membrane of brain cells, where it participates in signal transduction, receptor function (NMDA, AMPA, mAChR), and neurotransmitter release.
PS is synthesised endogenously from phosphatidylcholine or phosphatidylethanolamine, but dietary intake (primarily from organ meats, fish, and soy) is important, especially as endogenous synthesis declines with age. PS supplementation has been studied since the 1980s with a substantial evidence base for memory and stress management.
Key Benefits
- Memory and cognition: Multiple RCTs confirm PS 300mg/day improves memory formation, delayed recall, and cognitive processing speed in adults with age-related memory decline. FDA qualified health claim: "very limited and preliminary scientific research suggests PS may reduce the risk of cognitive dysfunction."
- Cortisol blunting: PS (400–800mg/day) significantly reduces exercise-induced cortisol and ACTH in athletes. Lower doses (100–300mg) provide moderate cortisol modulation in response to psychological stress.
- ADHD: Emerging evidence for PS in children and adults with attention deficits—improves focus, impulse control, and working memory.
- Mood: PS reduces anxiety and depression scores in stressed adults, partly through cortisol reduction and partly through direct neurotransmitter support.
PS is particularly valuable for overtraining prevention. Heavy exercise raises cortisol chronically, which impairs recovery, muscle protein synthesis, and cognitive function. PS 400–800mg/day in athletes reduces post-exercise cortisol by 20–30%, accelerates recovery, and prevents the cognitive impairment associated with overtraining. Indian athletes, military personnel, and professionals in high-stress careers are ideal users.
Forms and Sourcing
| Form | Source | Notes |
|---|---|---|
| Sharp-PS GOLD | Sunflower lecithin | Non-GMO, soy-free; preferred; comparable efficacy |
| Sharp-PS GREEN | Soy lecithin | Original form with 20+ years data; may concern GMO or phytoestrogen sensitive |
| Bovine brain PS | Bovine cortex | Richest natural source; largely discontinued due to BSE concerns |
Frequently Asked Questions
Does phosphatidylserine improve memory?
Yes—11 RCTs confirm PS 300mg/day improves verbal memory and delayed recall in adults with age-associated memory impairment. The FDA has issued a qualified health claim for PS and cognitive dysfunction. Effects begin after 4–6 weeks. Best evidence is for adults 50+ with early memory concerns; data in young healthy adults is more limited.
Does phosphatidylserine lower cortisol?
Yes—clearly established in athletes. PS 400–800mg/day reduces post-exercise cortisol by 20–30% without impairing performance. In stressed non-athletes, 200–400mg/day reduces acute cortisol responses. This makes PS uniquely valuable as a cortisol modulator that doesn't suppress the entire stress response—it blunts the peak while allowing appropriate baseline cortisol function.
Sunflower vs soy phosphatidylserine – which is better?
Sharp-PS GOLD (sunflower) is preferred: non-GMO, soy-free, suitable for those avoiding phytoestrogens, and has comparable efficacy to soy-PS in head-to-head comparisons. Soy-PS (Sharp-PS GREEN) has 20+ years of clinical data and is also effective. Choose sunflower PS unless cost is a significant factor, in which case soy-PS remains a valid option.
What is the phosphatidylserine dosage and when to take it?
Cognitive support: 100mg three times daily (300mg total) with meals. Cortisol blunting for athletes: 400–800mg before training. General supplementation: 100–200mg/day with meals. PS is fat-soluble—always take with food containing fat. Morning and lunch timing is practical. Allow 4–6 weeks to assess cognitive benefits.