Twinings Green Tea: Caffeine Content Explained

A 240 ml cup of Twinings green tea contains approximately 28 mg of caffeine.

• 28 mg — typical caffeine in a 240 ml brewed cup of green tea (population average).
• 5.7 hours — average caffeine half-life in adults (caffeine roughly halves every ~5.7 h).
• 400 mg/day — FDA recommended maximum for healthy adults; aim lower in pregnancy (~200 mg/day per various authorities).
• 70 mg — caffeine in a 240 ml serving made with 1 tsp matcha powder, for comparison.

Caffeine in standard Twinings green tea

Twinings’ green tea blends that use real green tea leaves typically deliver the same population-average caffeine found in brewed green tea: about 28 mg per 240 ml cup. That 28 mg figure is consistent with nutrient databases such as USDA/FoodData Central for a standard brewed green tea serving. Individual cups will vary with leaf amount, infusion time and water temperature, but 28 mg is the practical baseline for planning intake.

Caffeine levels in flavored and infused Twinings varieties

Flavored green teas fall into two categories: (1) blends that use green tea plus flavor (jasmine, citrus, fruit infusions) and (2) herbal "fruit" tisanes that contain no tea leaves. If the product is a green tea base (for example, Twinings Jasmine Green Tea), expect roughly 28 mg per 240 ml. If the label lists a fruit or herbal infusion with no Camellia sinensis, caffeine is typically 0 mg (herbal, caffeine-free).

Comparing Twinings green tea to coffee and other teas

Context helps: green tea is low-caffeine relative to most coffees and to some concentrated tea forms. Use the table below for direct comparisons using dataset values so you can plan your daily total.

Drink	Serving	Caffeine (mg)
Twinings / brewed green tea (typical)	240 ml	28 mg
Black tea	240 ml	47 mg
Matcha (1 tsp)	240 ml	70 mg
Drip coffee	240 ml	96 mg
Cold brew	240 ml	200 mg
Decaf coffee	240 ml	3 mg

How much caffeine remains over time (decay math)

Use 5.7 hours as the population-average half-life: caffeine in the bloodstream falls roughly by half every ~5.7 hours. From a single 240 ml cup of Twinings green tea (28 mg), here are the expected amounts remaining at common intervals.

Time after drinking	% remaining (approx)	Mg remaining (from 28 mg)
0 hours (dose)	100%	28 mg
3 hours	~69%	~19 mg
6 hours	~48%	~13 mg
9 hours	~33%	~9 mg
12 hours	~23%	~6 mg

Example: drinking 240 ml at 6 PM leaves roughly 13 mg still active around midnight (6 hours later), which can affect sleep for sensitive people. The half-life varies with age, liver function, pregnancy and drug interactions; EFSA and Mayo Clinic summaries explain these modifiers.

What changes Twinings green tea caffeine from cup to cup?

Key variables that change caffeine extraction:

• Steeping time — longer steeping increases extraction; a 1–3 minute difference matters more for tea than for coffee.
• Water temperature — hotter water extracts more caffeine; green teas are often brewed cooler to avoid bitterness, which reduces caffeine release slightly.
• Leaf grade and amount — broken leaves and fannings (bag tea) release caffeine faster than whole-leaf; more grams of leaf = more caffeine.
• Serving volume — larger cup = proportionally more caffeine; a 480 ml double-strength brew will contain roughly double the mg compared with 240 ml made identically.

Health, safety and timing advice

For healthy adults the U.S. Food and Drug Administration cites an upper bound of about 400 mg/day. For people who are pregnant or trying to become pregnant many authorities recommend staying below ~200 mg/day. The American Academy of Pediatrics discourages routine caffeine use in adolescents. If you experience palpitations, severe anxiety or other concerning symptoms, consult a clinician; this page is informational only.

Because Twinings green tea is low in caffeine, it is easy to include multiple cups while staying well under 400 mg. Track exact intake with tools like CoffeeLog to sum multiple sources (tea, coffee, energy drinks, pills) and time consumption to protect sleep.

Practical tips

• If you want lower caffeine: use slightly cooler water, a shorter steep (45–90 seconds), or choose Twinings’ explicitly caffeine-free herbal options.
• To boost caffeine moderately: use longer steep times or a stronger leaf-to-water ratio, or choose matcha (≈70 mg per 240 ml with 1 tsp).
• Check packaging — Twinings labels indicate whether a product is a green-tea blend or an herbal infusion; assume green = caffeine, herbal = 0 mg unless labeled otherwise.

Sources: USDA/FoodData Central (green tea reference values), FDA guidance on daily caffeine, EFSA and Mayo Clinic overviews, and American Academy of Pediatrics guidance on youth. For daily tracking and combined-source totals, CoffeeLog can log cups and calculate remaining caffeine relative to sleep time.