Lamberts® takes great care to ensure the purity of the 5-htp used in this product which is extracted from a natural source the seeds of a plant called griffonia. The extract from this plant is now one of the most extensively used supplements worldwide and is particularly popular in the usa where it has a long history of use. Our tablets are manufactured in the uk to pharmaceutical gmp standards. 5-htp short for 5-hydroxytryptophan is a derivative of tryptophan an amino acid that is present in high protein foods such as meat and dairy products and whilst the body makes its own 5-htp from tryptophan it is able to use the 5-htp provided by supplements. Daily intake: 1 to 3 tablets lamberts quantity – 60 tablets 5-htp 100mg.