Supplements and Antidepressants: The Interaction Checklist
Important framing first: this page is information, not medical advice, and anyone on psychiatric medication should run every supplement past their prescriber or pharmacist — a two-minute conversation that prevents real harm. That said, the interaction landscape has known shape. Here’s the map.
The genuinely risky tier
- St. John’s Wort — the notorious one: a potent serotonin syndrome risk with SSRIs/SNRIs/MAOIs, plus it lowers blood levels of many other drugs via liver enzyme induction. Never combine. (We don’t recommend it at all.)
- 5-HTP and tryptophan — serotonin precursors; combining with serotonergic antidepressants stacks toward serotonin syndrome risk. Prescriber conversation mandatory.
- High-dose SAMe — same serotonergic stacking concern.
The caution tier (dose-dependent, prescriber-dependent)
- Ashwagandha — thyroid interaction (relevant if on thyroid augmentation), possible sedative additivity, immune stimulation (relevant alongside immune-modulating treatments). Our full exclusion list applies with extra force here.
- Valerian — sedative additivity with sedating psychiatric meds — the valerian file.
- Melatonin — mixed, mostly small interactions; some prescribers are comfortable, others not. Ask.
The generally-lower-risk tier for sleep support
- Magnesium (glycinate) — no direct serotonergic activity; the main caution is general (kidney disease, antibiotic spacing)
- Glycine — a food-level amino acid; no established antidepressant interaction
- L-theanine — minimal interaction signal, though BP-medication users should note its mild BP effect
“Generally lower risk” is not “zero risk with your specific regimen” — the two-minute pharmacist check remains the rule.
Why this page exists
Most supplement sites bury interactions; a site that leads with them is either foolish or honest — we choose honest, because readers on psychiatric treatment deserve a map with the minefields drawn in ink. For everyone else, the master comparison ranks the sleep options from scratch.