Nitrogen Retention refers to the body’s ability to hold on to its critical nitrogen. The presence of certain specific substances in the body can help it to retain nitrogen. Anabolic steroids are one such class of substances. A second class are anabolic triturpenoids derived from natural herbal extracts. These products are legal and healthy for human consumption. Examples of these are pure Yohimbine alkaloids, Turnera, Suma, Agave, Maca and Catuaba.