I bought it online from Symbio UK, see here .
Fulvic Acid is the element found in humus, the highly nutritious layer of the earth. Partially decomposed matter is the basis of humus and peat. It is this highly nutritious layer that feeds plants and ensures that they grow strong and healthy. Fulvic Acid is created in extremely small amounts by millions of beneficial microbes that work on the decaying plant matter. It combines with a variety of minerals to create a complex molecular compound. Fulvic Acid works to activate the nutrients within soil so that they can be utilised by the cells of plants. It is often termed ‘nature’s miracle molecule’ and for good reason. - Victoria Health
A liquid solution of concentrated fulvic acid that spectacularly improves the
performance of fertilisers, reduces transpiration and improves early season
plant growth in low light conditions. Widely used by commercial growers to boost
yields and improve crop size - Symbio UK