Solgar 5-HTP Complex 90 Vegi Capsules 5-HTP (5-Hydroxytryptophan) is made by the body from the amino acid tryptophan and cannot be sourced from the diet. 5HTP is then changed into the neurotransmitter known as Serotonin. Solgar 5-HTP Complex 90 Vegi Capsules Extra Info Suitable for vegans Sugar, salt & starch free