A serious-topic disclaimer first
Low mood and depression are medical conditions, not supplement problems. Nothing here is a treatment or a substitute for therapy, medication, or professional care. Persistent symptoms warrant a clinician, and if you are in crisis, call or text 988 (U.S. Suicide and Crisis Lifeline) [4].
What's been studied
- Saffron has some randomized-trial evidence for low mood, though studies are often small.
- Omega-3s (EPA-weighted) have been studied for mood with mixed results [3].
- Vitamin D matters if you're deficient; correcting a shortfall supports overall health, and low levels are common [2].
- St. John's wort may be helpful for mild-to-moderate low mood per NCCIH — but it is also a powerful interaction hazard (see below) [1].
- Saffron, 5-HTP, L-tryptophan, rhodiola, and magnesium round out the commonly discussed options, with varying evidence.
The critical safety issue
Several mood supplements act on serotonin or drug-metabolizing enzymes:
- St. John's wort weakens many medicines — birth control, blood thinners, heart and HIV drugs, and more — and combined with antidepressants can be dangerous [1].
- 5-HTP and L-tryptophan raise serotonin and should not be combined with antidepressants (SSRIs/SNRIs/MAOIs) without medical supervision, due to serotonin syndrome risk.
Always tell your clinician and pharmacist what you take.
Practical guidance
Protect the basics first — sleep, activity, light, connection, and professional support. Correct a vitamin D shortfall, consider omega-3s, and treat serotonergic supplements (St. John's wort, 5-HTP, L-tryptophan) as clinician-supervised only. Supplements are a small, cautious adjunct to mental-health care, never a replacement [3][4].
