natural source, extracted from 800mg of griffonia seeds, a well-researched compound, featuring in 15 published studies, small, easy-to-swallow, taste-free tablets 5 htp or 5-hydroxytryptophan is a naturally occurring compound our bodies manufacture from the amino acid tryptophan. 5-htp is converted into serotonin in the brain, where it acts as an important chemical messenger. 5 htp is a well-researched nutrient, with over 15 published studies supporting its use. 5 htp tablets are now a top-selling supplement in the usa. & its long history of use has shown it to have an excellent safety record.each of our taste-free coated 5 htp uk tablets provides 100mg of pure 5-htp a level widely used in published empirical studies.we also insist on using the purest grade available for our 5-htp supplement. the 5-htp in our formula is extracted from the seeds of the griffonia simplicifolia tree. these seeds are carefully & sustainably harvested to ensure our raw materials are of the highest quality. unlike many other 5 htp uk products, this makes our formula a natural source, not synthetic. the raw material in our 5 htp uk supplement also undergoes heavy metal & microbiological testing to maintain the strictest quality & safety standards. our 5 htp formula is also made to good manufacturing practice (gmp) in uk factories. we've chosen to provide our 5 htp uk in small, easy-to-swallow tablets instead of capsules since this material can deliver highly concentrated amounts of the compound. our 5 htp uk formula is suitable for both vegetarians & vegans. unsure if our 5-htp supplement is for you? don't worry. our expert nutrition advisors are here to help. simply click the chat button located at the bottom right-hand of our website.