Excellent product. As far as the production of Growth Hormone is concerned, this product is one of the best. By studying I discovered that GABA is produced by the liver, but in small amounts. Therefore the need for this supplementation. The butyric amino acid that is produced by the liver sends the signal to our pituitary gland, causing it to produce the body's natural Growth Hormone. That is why I use this product before bed and every day I agree REGENERATED and well disposed. I have only one criticism to make. For we should have at our disposal a very large volume of GABA powder as a 1-kilo bag, for example. Thank you.