Phosphatidyl Serine (PS) is naturally produced in the brain, although its production dwindles as we age. Natural health practitioners often recommend PS for Memory, Alzheimer’s disease, Sports Injuries, and even Depression. Available in capsules it is naturally present in animal tissues, particularly those from the brain, liver and kidney but is most commonly produced from soybeans. The recommended maintenance dosage is between 100-300mg daily, although some practitioners may recommend a loading dose of 300-500mg daily for 2 weeks before starting the maintenance dose.

https://www.nationalnutrition.ca/food-supplements/lecithin/phosphatidyl-serine-ps.html ↗