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Question: Do any supplements help relieve stress?
Answer: Fish oil may blunt some of the effects of mental stress, such as increased heart rate and nervous activity. Several clinical studies show ashwagandha may help to relieve symptoms in people with anxiety. And, interestingly, a particular probiotic has been shown to lower levels of the "stress" hormone cortisol, and measures of psychological distress such as depression and anger.
L-theanine, an amino acid found in black and green tea, has been shown to reduce stress responses without causing drowsiness, and there is some evidence that the herbs passionflower and lemon balm may be helpful for anxiety.
One clinical trial found 500 mg of holy basil leaf extract taken twice daily significantly reduced measures of anxiety in men and women (Bhattacharyya, Nepal Med Coll J 2008). See the Encyclopedia article about Ayurvedic medicine for other uses for this herb - which is listed by its scientific name, Ocimum sanctum.
Ginseng is sometimes promoted for reducing stress, although one clinical study found it did not have an effect on cortisol levels. There is weak evidence that valerian supplements may produce a calming effect in stressful situations.
Be aware that low blood levels of iron and vitamin B6 have been associated with stress responses such as hyperventilation and panic attacks in women (Mikawa, Acta Med Okayama 2013), so be sure you're getting sufficient intake of these nutrients. There is some evidence that daily supplementation with a multivitamin-multimineral supplement may help people to cope with stressful situations.
For more information, use the links above, and see the Encyclopedia article about Stress.