Carbotein CARBOTEIN2.5 2.5 gal Soil Conditioner is an economical soil conditioner with superior plant growth promoting properties. Carbotein is a liquid soil conditioner that contains a mixture of organic vegetable extracts. It can be used alone or added to other sources of nitrogen, phosphorus and potassium. Carbotein not only promotes vertical growth, it also increases buds and flowers. Expect higher fruit and vegetable yields as well.