The biggest boost you can give your plants after nutrients is a high-quality fulvic acid, and T.A. Fulvic is the best in the world. Fulvic new formula comes from a unique source of fulvic acid, even more, complete than the previous one. It is a much darker colour due to the humic acids voluntarily preserved during extraction to avoid an excess of potassium in the solution. An overall more effective product, with a wider spectrum of active molecules, for the greatest benefit of your plants!