A preliminary placebo-controlled study of 20 patients with SAD Yoga poses printable found that hypericum plus weak light placebo was as effective as hypericum with bright light therapy in Yoga poses printable reducing symptoms of Sad Kasper, 1997.
In an eight-week 11-item postal survey of members of the SAD Association in the Uk Wheatley, 1999, those who used Kira 900 mg/day n = 168 had significant improvements in SAD symptoms that were comparable to improvements in those using Kira 900 mg/day plus light therapy n = 133. Limitations of this study include lack of randomization or blinding, and lack of information about the quantity and intensity of light therapy used by the subjects.
Although controlled clinical trials are needed to establish the efficacy of hypericum for SAD, preliminary data are supportive.
Quality and Potency of Brands Exercise care in choosing a quality brand of St. John's Wort. Standardized extracts usually contain 0.3-0.