The invention relates to methods of processing amniotic membrane to generate a substantially `growth factor free` membrane (GFF-membrane), and to methods of processing GFF-membrane to generate membrane enriched with specific and quantified levels of growth factors or other desirable membrane enriching molecules or compounds (E-membrane). The invention extends to GFF-membrane per se and E-membrane enriched with specific and quantified membrane-enriching compounds per se. The method also includes first and second medical uses of GFF-membrane and E-membrane. The method also extends to clinical uses of the amniotic membrane spongy layer or components thereof.