I was impressed by this product so only after 1 day taking it I came back here again to order one more to put at my work place. However, another brand's chaga was on sale (four sigmatic) so I tried that. Compared to four sigmatic, I think this brand is better. The only problem is that all chaga products seem to be expensive. I take 3g (1 tea spoon) per meal (best before meal but I take it after meal but still feel the effect) and this means that one bottle can be consumed very quickly.