Season 3, Episode 8 - "Brotherly Love"
Rose experiences a series of sleepless nights and drinks tea to help her sleep. Upon reading the tea's label, Dorothy immediately understands Rose's sleeplessness. What ingredient in the tea, which Rose confuses with "calcium," is causing her to stay awake?
Caffeine
Dorothy: Rose, have you been drinking much of this?
Rose: Only at night when I can't sleep.
Dorothy: But this is loaded with caffeine!
Rose: But we need caffeine, especially women our age! Or our bones will get brittle, and we'll walk all stooped over.
Dorothy: That's calcium, Rose. Calcium, not caffeine. This is what has been keeping you awake!
Rose: You mean if I stop drinking that, I can sleep?
Dorothy: You may even blink again.
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