Caffeine anhydrous is a dehydrated powder. It strips away the water, leaving just the stimulant. The result is a compact, fast-hitting dose that skips the liquid found in coffee or tea.
Athletes and people chasing quick clarity often reach for it in capsule or tablet form. A common window is 30 to 60 minutes before a workout or a task that demands sharp attention.
Keep your total daily caffeine under 400 mg from all sources. More than that invites jitters and sleeplessness. If you are pregnant, cap intake around 200 mg. Caffeine can temporarily spike blood pressure, so use caution if you have hypertension. It also clashes with stimulant meds, some antibiotics, and drugs that mess with heart rhythm.