YMMV - your mileage may vary. A way to indicate that two (or more) people may react completely differently to the same stimulus. (Taking the same amount of a particular supplement might be good for one, do nothing for another, and actually make a third feel worse, for example.).
mrc cfnc fmchc
IFM/Bredesen Reversing Cognitive Decline training 2017
What is, is. What is, can be changed.