Fuente: WIPO "tomato" Treatment compositions and methods for treating and/or preventing human hair thinning or hair loss comprising applying a chlorin treatment composition to an area of skin/scalp in need of treatment. A treatment composition preferably comprises a copper chlorin, such as a sodium copper chlorophyllin complex, trisodium copper chlorin p6, disodium copper isochlorin e4, or trisodium copper chlorin e6. A treatment composition comprises around 0.02 to 0.1% by weight of a chlorin, preferably a copper chlorin. A density and/or diameter of hair in an area being treated may be increased by at least 5%, more preferably at least 15%. Immune privilege in an area being treated may also be restored as measured by change in certain immunoglobulin antibodies.