Mice rejuvenated "decades"
In 2010, researchers from Harvard Medical School succeeded by experiment in rejuvenating mice with a biological age corresponding to that of 80 year old humans to the age of 25 year old humans, all by activating telomerase. This represents the first clear-cut reversal of the aging process in mammals. The metabolism of mice is nearly identical to that of humans, therefore this can be transferred to human life years.
Since Astragalus extract has only been taken by humans for five years, the observation period for a distinct rejuvenation of the outer appearance is yet too short. This is why, up to this date, only scientific measuring methods and detailed questionings to the consumers provides us with worthy information.
Source: http://www.ncbi.nlm.nih.gov/pubmed/21113150 Nature. 2011 Jan 6;469(7328):102-6. Epub 2010 Nov 28. „Telomerase reactivation reverses tissue degeneration in aged telomerase-deficient mice.” Jaskelioff M, Muller FL, Paik JH, Thomas E, Jiang S, Adams AC, Sahin E, Kost-Alimova M, Protopopov A, Cadiñanos J, Horner JW, Maratos-Flier E, Depinho RA.