Claims about milkīs unwanted effects (sidenote;at least here around,milk used to be promoted as a great health drink)
are not a few,ranging from completely irrational (milk harms bones ) to something like this.
As far as I know,none of these effects have been proven for real.
When it comes to proven,heresay to the direction of "this is not heresay,I heard them say so" does not qualify.
Reasons to despise milk may be cultural,for dietary reasons or shall I say,evolutionary geographical causes (disability to digest lactose)
" "It's herbal, there's no side effects." "
No side-effects may often be equal to no effects at all.A potential drug can/will cause side-effects,but this is normal for a drug strong enough to actually work.