I recently came off 60mg of Citalopram for depression and anxiety and moved onto Sertraline by my doc.
I'm currently on 100mg of Sertraline, my doc is likely to raise it to 150mg at my next appointment then to 200mg after that.

I've read that 5-HTP works well for depression and anxiety. Would it be okay if I took 25mg of 5HTP and 50 mg of Sertraline for a week or two to test whether it will work better for me?

The reason I want to try both is because I read that 5-HTP increases serotonin levels in the blood but does not necessarily cross the blood-brain barrier. And also that Sertraline does not increase serotonin levels but helps current serotonin cross the blood-brain barrier. Is there any truth in this or have I misunderstood?