What are the side effects of Phosphatidylserine?

Potential side effects include: Insomnia at high doses (paradoxical), GI upset, Nausea.

Can phosphatidylserine help with sleep?

Phosphatidylserine (PS) is a phospholipid that may help regulate cortisol, the stress hormone that can interfere with sleep when elevated at night. A study in the Journal of the International Society of Sports Nutrition found that PS supplementation blunted exercise-induced cortisol spikes. By supporting healthy cortisol rhythms, PS may indirectly promote better sleep quality, particularly for people with stress-related sleep issues.

How does phosphatidylserine support sleep?

Phosphatidylserine (PS) supports sleep primarily through its role in blunting the cortisol stress response via HPA axis modulation. Elevated evening cortisol is a recognized driver of sleep-onset difficulty and nighttime awakenings. By reducing cortisol output, PS may help the brain's sleep switch — the ventrolateral preoptic nucleus — transition more easily from wakefulness to sleep. Current evidence is rated Grade D (Preliminary), based on 2 studies with positive but early-stage results.

What is the recommended dose of phosphatidylserine for sleep?

Studies on phosphatidylserine for stress and cortisol reduction — the pathway most relevant to sleep — typically use doses of 100 to 400 mg per day. Doses of 300 to 400 mg in the evening are most commonly used in sleep-related research. Soy-derived PS is the most common supplement form, though sunflower-derived PS is available for those avoiding soy. The evidence for sleep specifically is still preliminary (Grade D), so PS is best considered as part of a broader stress-management approach.

Is phosphatidylserine safe to take for sleep?

Phosphatidylserine is considered safe and well-tolerated. It has GRAS (Generally Recognized as Safe) status in the United States. Clinical trials on cognitive function — where PS is more extensively studied — have generally reported a good safety profile at doses up to 400 mg per day for extended periods. Because the direct sleep evidence is still at the preliminary (Grade D) stage, PS is best used alongside other evidence-supported sleep strategies rather than as a primary sleep aid.

Is phosphatidylserine better taken in the morning or at night for sleep?

For sleep support, phosphatidylserine is most commonly taken in the evening — the time when cortisol reduction is most directly relevant to sleep initiation. Some formulas recommend splitting the dose between afternoon and evening to attenuate the late-day cortisol rise that can interfere with wind-down. Morning dosing is more common in cognitive performance protocols, where normalizing the cortisol awakening response is the target. Evening dosing aligns with the cortisol-lowering rationale for sleep.

Phosphatidylserine

phospholipid

Also known as: PS, SerinAid

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About

Phosphatidylserine is a phospholipid found in high concentrations in brain cell membranes. Research suggests it may support sleep by blunting the cortisol stress response through HPA axis modulation, potentially helping reduce evening cortisol levels that interfere with sleep.

How It Works

Blunts cortisol response to stress via HPA axis modulation; reduces evening cortisol for sleep facilitation.

Evidence For Conditions

Condition	Grade	Studies	Participants
Anxiety-Related Sleep Problems	D	2	--	View →

Side Effects

Insomnia at high doses (paradoxical)
GI upset
Nausea

Drug & Supplement Interactions

Blood thinners — phosphatidylserine may have mild anticoagulant effects
Anticholinergic drugs — may affect cholinergic signaling
Alzheimer's medications (cholinesterase inhibitors) — potential interaction

Always inform your healthcare provider about all supplements you take.

Quick Facts

Dosage: Sleep: 100-300 mg, evening
Forms: capsule tablet
Natural Sources: Soybeans, White beans, Egg yolks, Chicken liver, Bovine brain
Upper Limit: Not established; studied up to 600 mg/day
Best Time: With dinner or 1-2 hours before bed

Evidence Summary

Anxiety-Related Sleep Problems D

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.