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Yes—caffeine can reduce levothyroxine absorption if taken together; wait at least 60 minutes after your dose to drink coffee or tea.

No — current evidence shows caffeine doesn’t block vitamin C absorption; at most, heavy caffeine intake may nudge vitamin C loss in urine a little.

No, caffeine by itself doesn’t keep you full; any appetite dip is mild and fades within 1–3 hours.

Caffeine adds only a tiny heat boost; the warmth you feel comes mainly from the drink’s temperature and calories.

No, caffeine doesn’t kill a cannabis high; it can boost alertness yet sometimes deepen THC-linked memory fog, depending on dose and timing.

No, caffeine doesn’t “leach” calcium and magnesium in a meaningful way; the effect is small and offset by adequate calcium intake.

Yes — caffeine slowly leaves breast milk as your body clears it; levels usually peak about 1–2 hours after a drink and then decline over several hours.

Yes. Caffeine briefly narrows blood vessels—especially in the brain—so regional blood flow can dip before normalizing with tolerance or activity.

No, caffeine doesn’t lower blood pressure; it usually raises it briefly, while long-term effects are modest and vary by dose and habit.

Yes—caffeine can nudge testosterone briefly, but everyday doses don’t change levels in a lasting way.