GREEN PLANET - GPH UPTAKE - 10LGPH Uptake is a liquid humic acid supplement that greatly improves the availability and uptake of nutrients from the soil. It promotes a healthy and active root zone throughout all stages of growth. GPH Uptake is a soluble formula of humic acid that aids the plant with nutrient uptake throughout its entire life cycle. Humic acid acts as a chelator, and when added, will improve your soils ability to hold onto nutrients. This means your grow medium is