Pure Serine Supplement, 500 Grams (250 Servings), Filler Free, Water Soluble, No GMOs, and No Gluten10May promotes natural production of L-Tryptophan & L-Cystine over time10Taking daily offers essential amino acid support for optimal brain health10No Additives, No Preservatives, No Fillers, No GMOs, No Artificial Colors, No Soy, and No Gluten10Scoop is included to get the correct measurement every time. Take it daily with or between meals by adding it to a shake or smoothie10