AI: 00.8%. Indole-3-butyric Acid. Hormodin is a root inducing plant hormone. Hormodin is a formulation of indole-3-butyric acid (IBA). IBA is a synthetic auxin rooting hormone, which acts as a root stimulant. Hormodin 3 is prepared specially for propagating the more difficult to root varieties, including many of the evergreens and dormant leafless cuttings.