Brisk Iced Tea (Lemon) has more caffeine than rooibos (red bush) tea on both counts: 11mg per 12 oz can against 0mg per 8 oz cup, and about 1mg per fluid ounce against 0. The serving sizes differ, so the table below shows both ways of counting.
rooibos (red bush) tea vs Brisk Iced Tea (Lemon): the numbers
| rooibos (red bush) tea | Brisk Iced Tea (Lemon) | |
|---|---|---|
| Caffeine per serving | 0mg per 8 oz cup | 11mg per 12 oz can |
| Caffeine per fl oz | 0.0mg | 0.9mg |
| Servings to reach 400mg (FDA context) | n/a (caffeine-free) | 36.4 |
Sources: rooibos (red bush) tea's figure is verified in our rooibos (red bush) tea caffeine guide against USDA / naturally caffeine-free herbal (source); Brisk Iced Tea (Lemon)'s figure is verified in our Brisk Iced Tea (Lemon) guide against Caffeine Informer (source).
The concentration gap is the striking part: Brisk Iced Tea (Lemon) packs roughly 92 times the caffeine per ounce. Sipping speed matters at that density; a 12 oz can finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick rooibos (red bush) tea when you want the lighter dose or a slower ramp, and Brisk Iced Tea (Lemon) when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.
For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.
Related reading
- rooibos (red bush) tea: the full caffeine guide
- Brisk Iced Tea (Lemon): the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
As an Amazon Associate, Barista Life earns from qualifying purchases.
Gear from this guide
FAQ
Does rooibos (red bush) tea or Brisk Iced Tea (Lemon) have more caffeine? Brisk Iced Tea (Lemon): 11mg per 12 oz can versus 0mg per 8 oz cup for rooibos (red bush) tea.
Which is stronger per ounce? Brisk Iced Tea (Lemon), at about 0.9mg per fluid ounce versus 0.0mg for rooibos (red bush) tea.
Comparing caffeine? The caffeine comparison tool puts hundreds of drinks side by side, and the caffeine curfew calculator can check your cutoff time for tonight.
Get the good coffee stuff
One email a week: what we verified, what is worth buying, and what is not. No spam, unsubscribe any time.