Why Lindens?. 1 tablet provides 50mg Griffonia Simplicifolia Seed Extract 5-HTP 8:1 ratio, equivalent to 400mg L-5-Hydroxytryptophan (5-HTP) with added 900mcg Vitamin B5 (15% NRV). One tablet provides L-5 Hydroxytryptophan (5-HTP) from Griffonia Seed Extract 8:1 ratio: 50mg with added Vitamin B5.