Last week I went off of it for two weeks just to see if I could discern any difference. I felt my mild depression return and I couldn't lift myself out. With the supplement, I can.
Very expensive, but I'm going to keep using it as I feel the results are worth it. Their website cites published clinical studies to it's efficacy.
Disclaimer: I have no relationship with the company other than being a customer and I don't derive any direct or indirect benefits from sales of their products. Just sharing this in case it helps someone and to see if anyone else has experience with their products.