NuSci L-Threonine Powder Pure (1000 Grams (2.2 lb))

What the brand says

L-threonine is classified as an essential amino acid. Human’s body does not synthesize L-threonine, so it must be obtained through the diet. L-Threonine is a key component of collagen, elastin and enamel proteins. Generally suggested serving size for adults: To take 1/2 teaspoon of the powder (2 g) 1 to 2 times daily. Or, adjust the use amount for specific use purpose.