The present invention relates to a composition and uses thereof for treatment of damaged tissue comprising at least one essential amino acid in L form and at least one essential lipid; wherein the composition is administered to a mammal suffering from severe tissue damage. The invention further relates to a composition and uses thereof comprising a mixture of one or more free L-amino acids in which the molar ratio of the free L-amino acids corresponds to the molar ratio of amino components in a mammalian tissue protein; and at least one essential lipid.