Single crystals of L-tyrosine-doped triglycine sulphate (LTTGS) were grown by low-temperature solution method. Morphological changes were observed on the grown crystals. Crystalline quality and cell parameter values were determined using rocking curve and powder X-ray diffraction analysis. The presence of r-tyrosine in LTTGS was estimated qualitatively by FTIR analysis. Microhardness studies carried out using Leitz Weitzler hardness tester at room temperature showed a decrease due to doping. Domain studies on b-cut plates were observed using scanning electron microscopy.