This L-Tryptophan pure powder (free base form) complies with US Pharmacopeia (USP) Quality Standards. There is not any additive or filler inside. Assay > 99%. It is fresh and new. There are 1~1.5 years shelf life available.

Characteristics: White to gray crystalline powder, very slightly bitter taste, slightly soluble in water.

Use suggestions: As a pure ingredient to mix in water, juice, or mix in smoothie, shake, or for formulation, R&D (research and development), or any other proper purpose. General serving size for an adult is 1/2 teaspoon of the powder (0.5 gram) 1 to 3 times daily on an empty stomach. For sleep aid, best used before bedtime. Consult a doctor before an individual consumption.

Storage conditions: Store in a closed container in cool and dry place, keep away from strong light and heat.

Size options: Kinds of packing sizes are available. Please choose above to order.