Exercise and omega-3 fatty acids/fish oil have proved very effective at easing mild anxiety and may aid concentration. Try a daily 30 minute walk and/or 4 to 6 1,00mg omega-3/fish oil capsules daily in 2 or 3 divided doses (start off with 1 a day and increase by one every few days).
Note: omega-3s tend to thin the blood so may be contraindicated if you have hemophilia or are taking blood thinning medication, including over-the-counter ones such as a daily aspirin. Seek medical advice if this is the case.
Having seen the devastating effects of Kava Kava in Australian Indigenous communities (and I've heard in North American ones too) I don't recommend it. St John's Wort (SJW) seems to work for some and not others. Trial data is very mixed. Be aware that SJW interacts with many prescription medications and over-the-counter supplements so seek advice if you are taking these. You might find these articles useful:
Ginkgo has repeatedly failed to show positive results, see for example this recent Wellsphere
article, and I suspect the same is true of ginseng. But give them a try.
Sorry about the typo, it is 1,000mg of omega-3, which should contain at least 180mg eicosapentaenoic acid (EPA) and 120mg docosahexaenoic acid (DHA).
Valerian may be effective for very mild anxiety, but these benefits can be a short lived. Despite the claims, Valerian is not a natural form of Valium (diazepam). In fact diazepam is a natural compound which occurs in most foods. I'm less convinced by passion flower. However, there shouldn't be any harm in trying them.
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