Ecological Formulas amino acid supplements come as capsules and pure powders. The range includes L-Glutamine Powder, L-Tyrosine Powder, Taurine, Resbid N-Acetyl Cysteine SR, Free Form Amino Acid Crystals, Norival with N acetyl L tyrosine and NH4-Redox with branched chain amino acids. Consult the label and other product information before use.