Just this one: https://www.amazon.com/Prescription-Nutritional-Healing-Fifth-Practical/dp/1583334009/ https://www.amazon.com/Prescription-Nutritional-Healing-Fi

Just this one: https://www.amazon.com/Prescription-Nutritional-Healing-Fifth-Practical/dp/1583334009/ https://www.amazon.com/Prescription-Nutritional-Healing-Fift... However that is just a book, and it doesn't even make a big deal out of 5-HTP in particular. I guess that's how I found out about it though. There are a number of supplements people take to tackle their own ailments including depression, and that is one of them. There's a reddit community /r/nootropics which discusses mood-altering supplements a lot.