Supplements is a large category with a wide variety of products. Most of these products can be broken down into a few specific function. Firstly, some of these products provide specific nutrients that may be missing or deficient from your plants base nutrient formula or needed in higher amounts for your growing style (Ex. Calcium/Magnesium). Second, many of these products add beneficial vitamins, amino's, bacteria and more to increase the ability of your plants to uptake nutrients (Ex. Vitamin B, Mycorrhizae). Lastly some of these products are designed to boost the overall health of your plants or help them recovery from periods of stress (Foliar Sprays and Kelp).