Overview
Iced coffee is coffee brewed hot by a normal method and then chilled or poured over ice — this preserves the bright, aromatic character of hot extraction. Cold brew is made differently: coarsely ground coffee is steeped in room-temperature or cold water for 12–24 hours, then filtered. Cold water extracts fewer bitter compounds and acids, producing a smoother, less acidic, naturally sweeter concentrate that’s typically diluted before drinking. Nitro cold brew is cold brew infused with nitrogen gas through a pressurized tap, giving it a creamy texture and cascading bubbles similar to a nitro stout beer, without adding dairy.
Caffeine content
Because cold brew uses a high coffee-to-water ratio and a long steep time, it is often higher in caffeine per ounce than drip coffee or iced coffee — commercially sold cold brews commonly contain roughly 200–300 mg of caffeine per 16-ounce serving, though this varies significantly by brand and concentration. This is a meaningful practical point: cold brew is not automatically “gentler” just because it’s less acidic — it can deliver considerably more caffeine per cup than a same-sized hot coffee.
Safety and contraindications
- Caffeine load: Because cold brew’s caffeine content is less predictable and often higher than expected, people managing caffeine intake (e.g., during pregnancy, or those with anxiety or arrhythmia) should check labeled caffeine content when possible rather than assuming cold brew is mild.
- Afternoon/evening timing: Caffeine has a half-life of roughly 5–6 hours in most adults; an afternoon cold brew can meaningfully disrupt sleep for caffeine-sensitive individuals.
- Ready-to-drink products: Bottled and canned cold brews vary widely in added sugar; check labels if managing sugar intake.
How it’s typically prepared
Cold brew concentrate is generally steeped at a 1:4 to 1:8 coffee-to-water ratio and diluted roughly 1:1 with water or milk before drinking; nitro cold brew is served straight from a pressurized tap, similar to draft beer systems.
Sources
Clinically reviewed by Dr. Shilpa Thakur. Last reviewed 2026-07-20. Educational information, not medical advice; consult a qualified clinician about caffeine intake if pregnant, breastfeeding, or managing a heart condition.