Phosphatidylserine

Cortisol and the stress response to intense exercise

The indication with the best evidence in healthy people is the dampening of the cortisol rise caused by high-intensity physical exercise: several controlled trials have shown that 600 milligrams per day of phosphatidylserine (or divided doses of 400 mg) taken before intense training sessions significantly reduce the post-exercise cortisol peak, which may translate into better recovery, a lower sense of accumulated fatigue, and better adaptation to training over the weeks.

This indication is especially relevant for endurance athletes, weightlifters, and people with high training loads who show signs of overtraining; the active doses are high (400 to 800 mg/day), which makes use more expensive, but the physiological effect is well documented and the safety profile is excellent compared with other cortisol-control strategies such as pharmacological corticosteroids.

Cognition in aging

In older adults with mild cognitive impairment, several randomized trials have shown modest improvements in episodic memory, free recall, and performance on attention tests with doses of 300 milligrams per day (100 mg ×3) for 3 to 6 months; the effects are consistent but modest, comparable to other cholinergic compounds such as citicoline, and are usually perceived more in formal neuropsychological tests than in the subjective day-to-day feeling.

In healthy young adults the data are more limited and the effects on "normal" cognition are small or inconsistent, which suggests that phosphatidylserine works best when there is a substrate of impairment or when it is used in the specific context of demanding physical training, not as a general-purpose nootropic for people without cognitive problems.

Pediatric ADHD and other uses

Some trials in children with ADHD have shown modest improvements in attention and behavior with doses of 200 to 300 milligrams per day for 2 to 4 months, especially when phosphatidylserine was combined with omega-3; these data are interesting but come from small and heterogeneous studies, and the decision to use it in children should be made with professional advice, not as a substitute for validated conventional interventions.

How to take it and precautions

The doses studied range from 100 to 800 milligrams per day depending on the indication: 100-300 mg/day for cognition in older adults, 400-800 mg/day to dampen the cortisol response to intense exercise, divided into two or three doses with meals because its absorption improves with dietary fat; clinical effects usually appear between 4 and 12 weeks, as it is not a fast-acting compound.

It is generally well tolerated; the most frequent adverse effects are mild digestive discomfort and insomnia if taken very late; people taking anticoagulants should be cautious because there are theoretical data on an interaction with platelet aggregation, especially at high doses; soy-derived products are allergenic for people with a soy allergy, a limitation to keep in mind when choosing the source.