Phosphatidylserine for Cognitive Function
Phosphatidylserine has a qualified FDA health claim for cognitive dysfunction, which reflects limited and inconsistent supporting evidence.
Overview
Verdict
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- 100 mg three times daily (300 mg/day) with meals; older trials used bovine-derived material, current products are soy or sunflower-derived
- Expected timeframe
- 3-6 months
Protocol
- form
- Soy or sunflower-derived phosphatidylserine. This matters: the trials showing the clearest cognitive benefit in the 1980s and 1990s used bovine cortex-derived phosphatidylserine, which is no longer available because of BSE concerns, and plant-derived material has a different fatty acid composition and weaker supporting evidence
- duration
- 3-6 months; cognitive trials ran 12-24 weeks
- co factor
- Take with meals containing fat. Evidence is mixed. Early trials with bovine-derived phosphatidylserine in age-associated memory impairment and mild dementia showed modest improvements in memory and learning measures, which is the basis of the reputation. Trials using soy-derived material have been much less consistent - some show benefit on memory in older adults with subjective complaints, others show nothing. The US FDA permits only a heavily qualified health claim, stating that very limited and preliminary evidence suggests phosphatidylserine may reduce cognitive dysfunction risk. Mechanistically it is a membrane phospholipid concentrated in neurons, influencing membrane fluidity, neurotransmitter release and signal transduction.
- titration
- Build to 100 mg three times daily with meals, totalling 300 mg/day
- starting dose
- 100 mg with breakfast
Evidence
What the studies say
Phosphatidylserine and the human brain
Glade MJ, Smith K
Evidence for cognitive benefit derives mainly from small trials with older bovine preparations; soy-derived trials show weaker and inconsistent effects
The effect of phosphatidylserine administration on memory and symptoms of attention-deficit hyperactivity disorder: a randomised, double-blind, placebo-controlled clinical trial
Hirayama S, Terasawa K, Rabeler R +5 more
Phosphatidylserine improved ADHD inattention and impulsivity scores and short-term auditory memory versus placebo
Safety
Caveats
Be aware of the source issue: the trials that generated phosphatidylserine reputation used bovine brain-derived material that is no longer sold, and today soy or sunflower-derived products may not replicate those results. The FDA-permitted claim is explicitly qualified as based on very limited and preliminary evidence. Phosphatidylserine is not a treatment for dementia. Progressive memory loss affecting daily function needs medical assessment - reversible contributors including B12 deficiency, hypothyroidism, depression, sleep apnoea, alcohol and anticholinergic medication burden are common and treatable, and early diagnosis of dementia allows access to treatment and planning. Safety: generally well tolerated, with insomnia and stomach upset the main effects, particularly at doses above 300 mg/day or when taken late in the day. Doses above 600 mg/day have not been well studied. There is a theoretical additive bleeding risk with anticoagulants, antiplatelet drugs and fish oil, and a theoretical interaction with anticholinergic and cholinergic medications including donepezil - discuss with your doctor if you take these. Soy-derived products should be avoided in soy allergy; sunflower-derived alternatives exist. Avoid in pregnancy and breastfeeding, as safety data are absent.
Less likely to help if
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