Compositions are described herein that are nutritional supplements that contain free amino acids. These supplements contain a homogenous mixture of free amino acids, wherein the free-form amino acids comprise L-Lysine, L-Valine, L-Tryptophan, L-Phenylalanine, L-methionine, L-Leucine, L-Threonine, L-Isoleucine, L-Arginine, L-Histidine, L-Tyrosine, L-Carnitine, L-Serine, L-Glutamine, Aspartic Acid, L-Proline, L-Glycine, Taurine, L-Cysteine, Gamma-aminobutyric acid (GABA), L-Alanine, L-Glutamic acid, and wherein the composition comprises at least one B vitamin. These compositions are of use to treat disorders associated with a deficiency at least one amino acid, such as soft tissue injury, insomnia, panic attacks, anxiety disorders, eating disorders, anorexia, depression, chronic pain, emotional distress, chemical dependence, alcoholism, and hypoglycemia.