Buy Phosphatidylserine

Products that match the form and dose used in the studies. Umbral earns a commission on some purchases; the order never changes because of it.

Emerging

300–400 mg/day of PS; the one trial with a positive TSST result used 400 mg PS plus 400 mg phosphatidic acid, and 600 and 800 mg did not work in that same trial

Ratings, prices and photos were read from Amazon on Sep 18, 2026. Amazon prices change; the current one is on the product page.

As an Amazon Associate, Umbral earns from qualifying purchases. Product data is provided by Amazon and may change; ratings and prices shown are Amazon’s, not Umbral’s. Recommendations are based on the evidence grade and the form used in trials, never on commission.

Phosphatidylserine 300 mg, Memory, Focus + Cortisol Support

4.5(6,142)

$19.95

300 mg per serving is the bottom of the trial range and the most-bought single-ingredient PS. Anything sold as a memory blend hides how much PS you are actually taking.

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Amazon price on Sep 18, 2026.

Nutricost Phosphatidylserine 400 mg, 120 Capsules

4.5(1,298)

$23.95

400 mg is the dose that moved cortisol in the stress-test trial. Note that 600 and 800 mg did nothing in that same study — more is not better here.

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Amazon price on Sep 18, 2026.

NOW Soy-Free Phosphatidyl Serine 150 mg, sunflower-derived

4.6(405)

$27.70

Sunflower-derived, for anyone avoiding soy. Two capsules give you the 300 mg dose, and it is the highest-rated of the three.

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Amazon price on Sep 18, 2026.

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What to look for

✓Soy- or sunflower-derived phosphatidylserine, 300–400 mg/day; the HPA-axis trials used either bovine-cortex PS (no longer sold) or a soy PS + phosphatidic acid complex (PAS) at 400 mg + 400 mg
✓300–400 mg/day of PS; the one trial with a positive TSST result used 400 mg PS plus 400 mg phosphatidic acid, and 600 and 800 mg did not work in that same trial
✓Third-party tested (USP, NSF, Informed Sport)

What to avoid

✕Proprietary blends that hide the dose per ingredient
✕Unstandardised extracts with no active-compound percentage

Safety notes

· Insomnia and stomach upset are reported above 300 mg/day — an own-goal in a sleep stack if dosed late.
· Soy-derived product: avoid with soy allergy; sunflower-derived PS is the alternative.
· Older bovine-cortex PS is off the market over TSE risk; do not source it.

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As an Amazon Associate, Umbral earns from qualifying purchases. Product data comes from Amazon and may change; ratings and prices are Amazon's, not Umbral's. Suggestions are based on the science and the form used in studies, never on commission.

Umbral is a wellness product, not a medical device. It does not diagnose, treat, cure or prevent any disease. Supplement information is educational; talk to a clinician before starting anything, especially if you are pregnant, under 18, managing a condition or taking medication.

These statements have not been evaluated by the Food and Drug Administration.