The invention provides a blend of amino acid powders that have been exposed to pulsed laser radiation. The pulsed laser radiation is obtained by passing laser radiation through a device, which has a first diffraction grating, a second diffraction grating, and a refractive element positioned between the first and second diffraction gratings. Passing the laser radiation through the device cancels a portion of the laser radiation by destructive interference, and produces pulses of laser radiation by constructive interference. The blend of laser treated amino acids has been found useful in regenerating active myocardial tissue. The invention further provides a process for preparing the laser treated blend of amino acid powders and a method of regenerating active myocardial tissue with the blend.