Dietary Supplement PS Factor Healthy Brain Function Purity & Potency Guaranteed Sharp•PS Green PS-IQ synergistically combines PS (phosphatidylserine) and valuable essential fatty acids to support brain function. The tuna oil and EPO are tested for heavy metals, pesticides and peroxide. PS-IQ is ideal for anyone seeking nutritional brain support safely and naturally. Manufactured by Natural Factors to ensure safety and potency in accordance with Good Manufacturing Practices (GMP) of the FDA and Health Canada.