I have not purchased this product from Amazon but have used it or its differently branded cousins for 19 years. I will tell you I have never noticed better sleeping or increased energy. However I have found nothing better for back pain.
I herniated a disc in 1993 and decided not to have surgery, I rehabbed it myself and was out of work for 6 months. Siberian Root was recommended by my son's martial arts instructor who was schooled in Chinese medicine. This product,combined with rest and stretching treatments, kept me from ever having back surgery.
When the injury was fresh, I started taking up to 6 per day and noticed no negative side effects whatsoever, but a reduction in pain. I am generally not allergic to many things either, your mileage may vary. As time went on I eventually dropped to one per day maintenance dose.
Did it work, was it the Siberian root? You decide. After 6 months, I ran out and within 3 days, my knee started involuntarily twitching from pressure on the nerve involved along with the return of muscle pain. I restarted Siberian root and both the pain and twitching stopped again. I had a similar episode 2 years after the fact, only this time it took two weeks for the pain and twitching to return. I have been taking it ever since, one per day. No problems. I have recommended it to family members who have had similar results.
Its effect are subtle but very real, and I think it takes some days or weeks to build up in your system. For me, this stuff was a life saver. My own opinion is that that it has anti-inflammatory properties and may even rebuild nerve pathways. I say that only because I have regained most of the muscle strength I lost in my inner thigh when the herniation happened.
UPDATE: 10/2015
Not long after the review I found I didn't even need Siberian Root anymore, the pain and twitching had stopped never to return....or so I thought. This time I had been off Siberian Root for 2-3 years and had suffered no issue with the nerve pressure when, yes, it has returned again. I took two capsules and the situation resolved almost immediately, so that is why I am back to buy some more. There is no doubt after 22 years this stuff works and works well even though its effects can be subtle
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