Natrol 5-htp 200 mg. Maximum strength dietary supplement helps make you feel calm and relaxed so you can seize the day. These 30 dietary supplements each come in a time-released capsule for maximum potency and faster effect. Our formulation works by helping boost healthy production of serotonin to help you maintain a positive outlook in life. Safe for everyday use, this 100% drug-free supplement is non-habit forming and may help reduce occasional feelings of anxiety.