Abstract: The present invention relates to a method for isolating progenitor cells from a human body, inclusive of all cells with stem cell-like characteristics, in particular pluripotent or multipotent progenitor cells, wherein such cells are directly or indirectly derived from human mammary secretion, be it colostrum, mature milk, or dry period secretion from males or females, of said human body during at least one of the following periods: non-pregnant period, pregnant period, lactating period, involuting period. The present invention furthermore relates to preferred uses of such isolated cells.