Caffeine – The Republic of Tea

How Much Caffeine is in Tea?

Caffeine content varies by tea type and how it is steeped. The Republic of Tea offers a wide range of teas with varying caffeine levels—from caffeine-free herbal blends to high-caffeine options for an energy boost.

What is Caffeine?

Caffeine is a naturally occurring stimulant found in the Camellia sinensis plant, the source of black, oolong, green, and white teas. It can improve alertness, mood, and energy, but too much may cause irritability, anxiety, or trouble sleeping.*

Average Caffeine Content by Tea Type

Tea Type	Caffeine per 6 oz cup
Black Tea	~50 mg
Oolong Tea	30–40 mg
Green Tea	20–30 mg
White Tea	15–20 mg
Yerba Mate	~45 mg
Herbal Teas (Tisanes)	0 mg (naturally caffeine-free)

Note: Yerba mate is not from the Camellia sinensis plant but contains natural caffeine.

Decaffeinated vs. Caffeine-Free

Herbal teas are naturally caffeine-free.
Decaffeinated teas have caffeine removed using our CO₂ high-pressure extraction method, preserving flavor and quality. A small amount (2–4 mg per cup) may remain.

High-Caffeine Teas

Some of our specialty teas contain approximately 116 mg of caffeine per 6 oz cup, more than a standard cup of coffee. These are ideal for those seeking a stronger energy boost.

How Tea Caffeine Differs from Coffee

Tea contains L-theanine, an amino acid that promotes calmness and helps smooth the energy effect of caffeine. Many tea drinkers report feeling steady alertness without jitters or crashes.

Safe Caffeine Consumption

According to the FDA:

Moderate caffeine intake: 200–300 mg per day
High caffeine intake: Over 400 mg per day

This equates to:

~6 cups of black tea
~10 cups of green tea per day (6 oz servings)

Tolerance varies, so individuals should adjust based on their own sensitivity.

Factors That Affect Caffeine Content

Water temperature: Hotter water extracts more caffeine.
Steeping time: Longer steeping increases caffeine content.
Leaf size: Smaller leaves (e.g., in tea bags) release more caffeine than full-leaf teas.

Each tea on our website includes an estimated caffeine level. These values may vary based on origin, processing, and preparation.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent disease.