With lots of drugs/supplements, after a while your body gets used to the drug and it no longer have any effect (or a slighter one which leads to increased dosage)
and it seams logical....
But, with others it is the opposite :
How come ?
and it seams logical....
But, with others it is the opposite :
"After two weeks of use, Valerian did not provide any immediate benefit. However, after four weeks, significant improvements in sleep quality were reported as compared to those who were given a placebo"
How come ?

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