Guides to clinical psychology and mental health research
Guides
One question per page
A study summary answers what one paper found. These pages answer the question people actually arrive with, and gather every study we have covered that bears on it. They are updated as we publish more, and they say plainly where the evidence runs out.
Is EMDR evidence-based?
EMDR reduces PTSD symptoms and clearly beats no treatment, but pooled trials do not show it beating other established trauma therapies. What the evidence says, with every claim linked to its source.
7 studies covered
Does vitamin D help depression?
In a randomized trial of young people who were both depressed and vitamin-D deficient, eight weeks of high-dose vitamin D did not beat placebo for depression. What the evidence says, linked to its source.
6 studies covered
Bipolar disorder vs borderline personality disorder
The two are confused often enough that researchers built machine-learning models to separate them. What that research found, and what it says about which half of the problem is harder.
9 studies covered
Do psychedelics affect memory and cognition?
A single dose of psilocybin or MDMA showed no working-memory impairment in healthy volunteers, and better task accuracy three months on. Why that study's missing control group matters.
3 studies covered
What predicts therapy dropout?
Who the person is, which therapy they get, and how often sessions happen all move completion rates. What the research shows, and why the field cannot agree what finishing even means.
6 studies covered
Updated September 15, 2026