I am writing this after 2 years of use, I still have the original bottle and I keep it refrigerated. This product is basically an extract of a seaweed species called Ascophyllum nodosum. The thing is its a very potent product so use carefully and at 1/4 of recommended dilution. I believe its rich in cytokine hormones as lot of root growth can be seen after usage. It definitely gives a boost to plants provided you are using good soil. Use once weekly and at night. Best time to spray is just before the plants starts bearing flowers. Its also useful for seed germination as a pre-soak but use only a couple of drops for say one cup of water. I'll probably buy again after I finish my present bottle. It would be good if they mentioned the percentage(%) concentration on the label (standard brands of Ascophyllum nodosum concentrate come in various strengths) and I hope they will maintain the product quality in future.