Pure Encapsulations Cognitive Amino Acids – Pure Amino Acid Combination Pure Encapsulations Cognitive Aminos contains a combination of amino acids, including the essential amino acids phenylalanine and tryptophan. These two amino acids cannot be produced by the body itself and must therefore be obtained through diet. They are precursors to important neurotransmitters in the central nervous system and are thus indispensable for the organism. Application: Take 1 capsule 3 times daily between meals. Note: Lactose-, fructose-, and gluten-free. Do not take during pregnancy or while breastfeeding. The concurrent use of antidepressants is subject to a strict benefit-risk assessment by a physician.