I've started taking Ashwagandha at the end of 2014 with noticeable effects in reduction of anxiety and improved energy. At the time I was using Seeking Health's 300mgs capsules, 3% whitanolides extract and I kept going for almost 3 months, then I ran out of it and took a pause to avoid overdoing it. Fast forward to this year, I was going to try Ashwagandha again since I was dealing with lots of fatigue and inability to deal with many simple physical tasks. I ordered again the same brand but noticed they had changed the formula, this time 4.5% extract in 450mg capsules. I thought "maybe this time I will get a stronger effect". It turns out I didn't and I realized there are many different formulations out there some of which provide very different effects and some probably don't even work. The new SeekingHealth product did nothing for me in terms of energy boost (or anxiety reduction) but it regularly gave me a mild stomach ache. I was puzzled, so I started reading a bit and it turns out that some Ashwagandha extracts work better for boosting energy while others tend to be more relaxing. In other words you may be buying a product labeled "Ashwagandha" and not know exactly which effect to expect, if any. Why is that? Apparently it depends on the type of extract (root vs root + leaves) and in particular the concentrations of individual whitanolides (the active ingredients of the plant) which are numerous and with different functions. If you're a chemistry nerd you can take a look here: http://examine.com/supplements/Ashwagandha/ under "Composition", there's a whole lot of components. I recently tried Jarrow's Ashwagandha which uses a patented extract called KSM-66 which did the trick for me, boosting my low energy to a less horrible level. Unfortunately this extract does not affect anxiety nor it can be used before going to bed to help sleep (as I used to do with the previous product). There's another patented extract called Sensoril, which seems more fine tuned towards relaxation and anxiety reduction, but I've never tried it. Seems a bit more difficult to find too, at least in my area. What is your experience with Ashwagandha? What brand and dosage are you using? Has anyone tried the Sensoril extract? If so did it help? Cheers PS: if you have tried it and didn't get any effect, chances are you've tried an inefficacious product such as the Seeking Health extract. (I used to like their products because they don't add a ton of fillers, but this time they let me down.) I'd recommend giving a try to Jarrow's product. You should feel the effects pretty rapidly. For me it makes a signicant difference at 600-900 mgs/day.