Swedish Herbal Institute, Original Arctic Root Rhodiola Rosea, SHR-5, 40 Capsules

I can't say I noticed any difference - however this is the exact formulation that was used in a randomized trial that showed Rhodiola could help with fatigue from stress.

Just one person's thoughts here, and not sure why or how, but this seems to toughen me up mentally and physically, most notably in times of mental stress, physical exertion, or temporary under-nutrition. It does not seem to cause stimulation like caffeine, but will keep me awake if taken late in the day. I try to keep it in my medicine cabinet, and my briefcase.

I and my family took this for about two months, and while at first it seemed to help everyone's energy levels, after a couple weeks the effect really tailed off. Also, the first week or so of taking this affected my digestion negatively.I switched to New Chapter Rhodolia Force 100, and notice a big difference! My son and husband have noticed as well--my son is a runner, and his performance has improved.

I often take this in the morning and it helps clear the cob webs. Really seems to help consentration and focus.