Is There a Role for Saffron Phytotherapy in Treating Depression?

BRIEF COMMUNICATION

The field of integrative psychiatry is rapidly expanding, fueled in part by patients seeking natural remedies over conventional pharmaceuticals. A 2010 survey demonstrates that the majority of integrative medicine visits involve a mental health condition, of which depression is the most common.¹ As psychiatrists trained in Western medicine, we are disconnected from such therapeutic modalities and their evidence basis, often struggling to provide appropriate psychoeducation to our patients. Here, we adopted an “open-minded” approach and examined the evidence behind the use of saffron in patients with depressive disorders.

Saffron is the dried stigma of the crocus sativa plant and has been used in Eastern medicine for centuries for various ailments including mood.² Cultivation of the stigmas, which contain the components believed to have therapeutic properties, is extremely labor intensive. Stigmas contain 4 bioactive compounds: crocins and crocetins, which are responsible for the characteristic deep yellow color of saffron; picrocrocin, responsible for the characteristic bitter taste; and safranin, responsible for the hay-like aroma.³ These compounds exert antioxidant, anti-inflammatory, serotonergic, neuroendocrine, and neuroprotective effects.

An early metanalysis of 6 double-blind RCTs, all conducted in Iran, encompassing 230 adults with major depressive disorder (MDD) brought forward compelling evidence for the efficacy of saffron as an antidepressant.⁴ All studies compared saffron dosed 30 mg per day against conventional antidepressants, or placebo. Two studies compared saffron with placebo treatment; 3 compared it with fluoxetine 20 mg daily; and 1 with imipramine 100 mg daily. Overall, there was a significant reduction in the Hamilton Depression Rating Scale (HAMD), without statistical significance between groups.

Since then, additional studies have emerged. A randomized controlled trial (RCT) comparing citalopram to saffron, showed improvements in both depression and anxiety over 6 weeks as measured by the HAMD and the Hamilton Anxiety Rating Scale (HAMA) in patients with mild to moderate symptoms.⁵ Another double-blind RCT used a slightly higher dose of saffron at 50 mg daily against placebo in mild to moderate MDD patients over 12 weeks. A statistically significant reduction in depression was found, as measured by the Beck Depression Inventory (BDI).⁶

In a 2015 double-blind RCT, Talaie and colleagues⁷ looked specifically at the stigma component crocin dosed at 15 mg twice daily as an adjunct to SSRI treatment in 40 patients and found significant score improvement on the BDI after 4 weeks when compared with placebo. More recently, Kashani and colleagues⁸ compared saffron dosed at 15 mg twice daily against fluoxetine 20 mg daily in the treatment of mild to moderate postpartum depression over 6 weeks and found equal efficacy among the 2 treatments. Remission and partial response rates were almost identical between the groups. A 2019 study restricted to a patient population aged 60 years and older compared reduction in HAMD with daily treatment of saffron 60 mg against sertraline 100 mg for 6 weeks.⁹ In line with previous studies of wider patient populations, the researchers concluded that both agents were equally effective at reducing depressive symptoms.

A systematic review by Marx and colleagues¹⁰ analyzed 23 studies and demonstrated saffron had a large positive effect size over placebo for depressive symptoms (g = 0.99) and anxiety symptoms (g = 0.95) and when used as an adjunct (g = 1.23) to traditional antidepressant medications. The authors went as far to conclude saffron appeared superior to placebo, both interdependently and as an adjunct, but a potential publication bias was noted. Two more recent meta-analyses have found similar results. In a 2018 meta-analysis of 7 RCTs, saffron was of comparable efficacy to traditional antidepressants and without any reports of serious adverse events reported.¹¹ Most recently, Khaksarian and colleagues concluded that saffron was as effective as fluoxetine in the treatment of MDD upon review of 8 RCTs.¹²

Importantly, no serious adverse effects were reported in any of these saffron studies. In fact, one study even evaluated its cardio protective effects in patients with comorbid depression and prior histories of post-percutaneous coronary interventions.¹³ The underlying mechanism for this was hypothesized to be attributed to crocin scavenging free radicals, exerting antioxidant effects, and inducing hypotensive effects.

Thus far, in several small studies, saffron dosed at 15 mg twice daily has shown similar efficacy to conventional antidepressants. This finding, however, was only demonstrated in patients with mild to moderate severity of unipolar depression. The exact adverse effects, long-term outcomes, as well as feasibility for use in populations with comorbidities or on complex regimens have not been explored. It is important to note that in all studies, 4 to 6 weeks were required for any demonstrable improvement. It is also relevant to note that studies of cognitive behavioral therapy (CBT) in mild to moderate depression have shown results on par with conventional antidepressants, and with the studies of saffron.^14,15 Saffron supplements are not cheap. Online retailers are selling it for $120 per ounce, equating to 280 doses and about 86 cents per day or $26 per month—twice the cost of a SSRI treatment.¹⁶

Clinical bottom line

Current evidence is intriguing regarding the potential antidepressant effects of saffron. We certainly do not consider this to be ready for clinical implementation and do not advocate for its endorsement by physicians in replacement of the current standard of care. However, it is likely that in our practices, we will encounter patients who have questions concerning integrative therapeutic modalities, and it is important to know the existing evidence as well as limitations of recent studies. Potentially, if saffron is to undergo rigorous large trials for safety and efficacy and obtain FDA approval, it could serve as an option for patients with unipolar mild-moderate depression who are resistant to conventional antidepressants or CBT.

Dr Stanciu is Assistant Professor of Psychiatry at Dartmouth’s Geisel School of Medicine and Director of Addiction Services at New Hampshire Hospital, Concord, NH. He is the Addiction Section Editor for Psychiatric Times. Dr Teja is an upcoming PGY-5 Addiction Psychiatry Fellow at Dartmouth’s Geisel School of Medicine, Hanover, NH. The authors report no conflicts of interest concerning the subject matter of this article.

References

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