Just adding personal experience with a family member here....
SSRIs had some very severe side effects for him, but 5HTP really helped greatly. It was a physician that tapered him off the SSRI and onto the 5HTP
He actually found 50mg each night to be optimum dose (this was for OCD & anxiety) but I know some people benefit from higher doses. It does make one sleepy, at least it did him.
I do also know of some people who prefer Tryptophan over 5HTP, but my relative did not tolerate it as well as the 5HTP.

Again, always discuss with your own doctors, and a word of caution that 5HTP cannot be taken with SSRIs or anything else that elevates Serotonin levels as that can cause Serotonin Syndrome