Wondering if oolong tea contains caffeine? Discover how much caffeine is in oolong tea, how it compares to other teas and coffee, and what factors affect its content—plus tips for brewing the perfect cup.
A
t Furn-store, we believe that the most comfortable homes are built on rituals. The morning coffee in your favourite armchair. The afternoon pause with a book and a warm mug. The evening wind-down with a soothing brew before bed.
If oolong tea has found its way into your daily routine, you might be wondering: d
oes oolong tea have caffeine?
And if so, how much?
It's an important question—whether you're watching your caffeine intake, sensitive to its effects, or simply curious about what's in your cup. Today, we're diving deep into the world of oolong tea to answer all your caffeine questions, backed by scientific research and practical knowledge.
T
h
e Short Answer: Yes, Oolong Tea Contains Caffeine
Le
t's get straight to the point: oo
long tea does contain caffeine .
But here's where it gets interesting: the amount of caffeine in your cup of oolong can vary dramatically based on several factors. From how it's processed to how you brew it, many variables influence the final caffeine content.
How
M
uch Caffeine Is in Oolong Tea?
The c
affeine content in oolong tea typically falls betwe
en that of green tea and black tea . Th
i
s
makes sense, given that oolong is semi-oxidized—somewhere between unoxidized green tea and fully oxidized black tea .
A scientific study published in
Molecules
found that oolong tea contains approximately
19.67 ± 2.95 mg of caffeine per gram of dry leaf
.
This places it below both green tea (34.86 mg/g) and black tea (28.54 mg/g) in terms of concentration .
owever, another recent study from 2025 published in Fo
ods r
eported slightly different values, with oolong tea containing about 4
± 1.6 mg of caffeine per 200 mL serving w
hen brewed under standard conditions .
T
he variation highlights an important point: caf
feine content is not fixed—it
depends on many factors.
Fac
t
ors That Affect Caffeine Content in Oolong Tea
1. O
xidation Level
Oolo
ng tea is defined by its partial oxidation, but "partial" covers a wide spectrum. Some oolongs are lightly oxidized (closer to green tea), while others are heavily oxidized (approaching black tea) .
Gen
e
rally, more
oxidation means potentially higher caffeine content, tho
ugh the relationship isn't perfectly linear. The processing methods—including withering, shaking, and rolling—all influence how much caffeine ends up in your cup .
Tea le
aves harvested earlier in the season, particularly the tender buds and young leaves, typically contain more caffeine than mature leaves. The bu
ds and first leaves have the highest concentration, whil
e older leaves lower on the stem contain less .
This is
one of the most significant variables you control. Research from the IARC Monographs shows clearly that longer
steeping times extract more caffeine :
For loose-leaf oolong, the pattern is similar but with slightly lower extraction:
1 minute:
17 ± 0.3 mg
3 minutes:
20 ± 0.6 mg
5 minutes:
24 ± 0.2 mg
his data reveals two important insights: b
agged tea releases caffeine faster,
and t
ime matters enormously.
A quick steep yields a much lower caffeine cup than a prolonged one.
4
. Brewing Temperature
H
igher water temperature extracts more caffeine. A 2025 study found that brewing temperature significantly affected caffeine levels in oolong tea, with higher temperatures leading to greater extraction .
The same study noted that while caffeine increased with temperature, L-theanine (the calming amino acid in tea) remained stable—meaning ho
tter water gives you more caffeine without more calming compounds .
Thi
s seems obvious, but it's worth stating: mor
e tea leaves = more caffeine. I
f you use two teaspoons instead of one, you're doubling the potential caffeine extraction. Similarly, a larger cup with more water will contain more total caffeine (though the concentration per ounce may be similar).
6.
Serving Method: Bagged vs. Loose-Leaf
Res
earch shows that serving method makes a difference. In black tea (and likely applicable to oolong), cup
-sized bags yielded higher caffeine levels (39 ± 9.9 mg/200 mL) than loose-leaf tea (24 ± 7.2 mg/200 mL) .
T
h
is is likely because bagged tea contains smaller, broken leaves with more surface area for quick extraction.
Oolo
n
g Tea vs. Other Beverages: A Caffeine Comparison
To pu
t oolong's caffeine content in perspective, here's how it stacks up against common drinks :
As you can see,
oolong sits comfortably in the moderate range
—less than coffee and most black teas, but more than many green and white teas.
T
he Unique Balance: Caffeine and L-Theanine in Oolong
O
ne of the most remarkable aspects of oolong tea—and all true teas—is that caffeine doesn't act alone. Tea contains L
-theanine,
an amino acid that promotes relaxation and reduces anxiety without causing drowsiness .
Thi
s
synergistic effect means that the c
affeine in oolong tea may feel different from the same amount of caffeine in coffee. Man
y people who are sensitive to coffee find they can enjoy oolong without negative effects.
Healt
h
Benefits Beyond Caffeine
While
caffeine often gets the attention, oolong tea offers numerous health benefits worth appreciating :
A study f
rom the University of Tsukuba found that drinking two cups
of oolong tea daily increased fat breakdown by about 20% compared
to a placebo—and notably, this effect continued during sleep . The res
e
archers noted that this could have "real clinical relevance for controlling body weight" .
Regular con
sumption of oolong tea has been linked to improved cardiovascular health, including reduced blood pressure and lower cholesterol levels . The antio
x
idants in oolong—particularly polyphenols like catechins—help protect blood vessels and support healthy circulation.
Blood Sugar
Control
Some studies
suggest that oolong tea may help maintain healthy blood sugar levels and reduce the risk of type 2 diabetes . The catech
i
ns, especially EGCG, have antioxidant and anti-inflammatory properties that contribute to this effect .
Bone Health
Obse
r
v
ational stu
dies have suggested that long-term consumption of oolong tea may have beneficial effects on bone health, particularly among postmenopausal women .
Mental Alertness
While oolong tea is s
afe and healthy for most people, certain groups may want to monitor their intake :
Pregnant and breastf
e
e
ding women should limit caffeine
consumption. Health authorities generally recommend keeping caffeine under 200 mg per day during pregnancy .
Individuals with anxi
e
t
y disorders or caffeine sensitivity may find that even mod
erate caffeine affects them. Starting with a shorter steeping time (1-2 minutes) can yield a lower-caffeine cup.
People taking certain m
edications should consult their h
ealthcare provider, as caffeine can interact with some drugs .
Those with iron defici
e
n
cy should note that tea ta
nnins can inhibit iron absorption. Drinking tea between meals rather than with iron-rich foods can help mitigate this effect .
Children should general
l
y
avoid c
affeine, though small amounts in tea are unlikely to cause harm. Many parents opt for caffeine-free herbal options for kids.
How to Control Caffeine i
n
Your Oolong Tea
The beauty of brewing your
own oolong is that you have control. Here's h
ow to customize
your cup:
For Lower Caffeine:
Steep f
or less time: 1-2 m
inutes instead of 3-
5
Consider a second steep: The
first infusion extracts
the most caffeine; subsequent steeps contain progressively less
Try lighter oolongs: Less ox
idized varieties may
have slightly less caffeine
For Higher Caffeine:
Steep lo
nger: 5+ minutes ext
racts maximum
caffeine
Cho
ose bagged tea: Broken leav
es release caffein
e faster
Brewing the Perfect Cup of Oolon
g
Now that you understand oolong's
caffeine, let's talk about brewing it well. After all, the best cup is one that tastes delicious and suits your needs.
Traditional Gongfu Style
This meth
od, common in Chinese te
a culture, uses many leaves and short steeps:
Use 5-8 grams of leaves for a sma
ll teapot (100-150 ml)
Rinse leaves briefly with hot water (this is "awakening" the tea)
Steep for 20-30 seconds for the first infusion
Increase steep time slightly with each subsequent infusion
Enjoy 5-10 infusions from the same leaves
This approach yields many small c
u
ps of tea, each with
balanced caffeine and complex flavor.
Western Style
More common in every
d
ay home brewi
ng:
Use 1 teaspoon (about 2-3 grams) p
er 8 oz cup
Heat water to 90-95°C (just below boiling)
Steep for 3-5 minutes depending on desired strength
Remove leaves and enjoy
This gives
y
ou one satisfying cup w
ith moderate ca
ffeine.
Cold Brew
For a smoother, lower-caf
f
eine opti
on:
Add 1 tablespoon of oolong leaves t
o a pitcher of cold water
Refrigerate for 8-12 hours
Strain and serve over ice
Cold brewing extracts less caffeine
than hot brewing and
produces a naturally sweet, no
n-bitter tea.
Common Questions About Oolong Tea a
n
d Caffeine
Is oolong tea caffeine-free?
No, oolo
ng tea naturally contains ca
ffeine. If you need a completely caffeine-free option, look for herbal tisanes like chamomile, peppermint, or rooibos, which come from different plants .
Can I drink oolong tea at night?
It
d
e
pends on your caffeine sensitivi
ty. Some people can enjoy a light oolong in the evening without issue, while others find even small amounts of caffeine disrupt sleep. Research shows that moderate oolong consumption doesn't significantly affect sleep patterns in most people , but individual responses vary.
No, coffee typically contains 2-3 time
s more caffeine than oolong tea . An 8 oz cup of brewed coffee average
s
95 mg, while oolong averages 30-50 mg.
Which has more caffeine: oolong or gree
n tea?
Generally, oolong contains slightly mor
e caffeine than green tea, though there's overlap depending on the specific tea and brewing method .
Does oolong tea cause jitters?
Can I develop a tolerance to oolong's caff
eine?
Yes. Regular caffeine consumption can lead
to tolerance, meaning you may feel less stimulant effect over time. The study from the University of Tsukuba noted that participants developed tolerance to caffeine's effects during their 2-week trial .
Creating Your Oolong Tea Ritual at Home
Choose Your Vessel
Oolong tea tastes best in
vessels that hono
u
rits complexity. A small clay teapot (Yixing is traditional) or a simple gaiwan allows the leaves to unfurl fully . But don't let tradition intimidate you—a fa
v
ourite mug works beautifully too.
Find Your Spot
Designate a corner of your home
for tea time.
A
small tray on your coffee table, a windowsill perch, or a dedicated tea table all work wonderfully. Keep your tea canister, your favourite pot, and a cherished cup within easy reach.
Set the Atmosphere
Soft lighting, a comfortable
chair, perhaps a
v
iew of greenery—these elements transform a simple beverage into a ritual. At Furn-store, we design furniture for these moments: armchairs that invite lingering, side tables that hold your cup just right, lighting that soothes rather than shouts.
Be Present
The greatest gift of tea is the pause
it create
s
.As your oolong steeps, resist the pull of your phone. Watch the leaves dance in the water. Inhale the evolving aroma. Take that first sip with full attention. This is not just drinking—this is being.
A Final Thought
So, does oolong tea have caffeine?
Yes—but that's
not the whole story. It has caffeine in balance with L-theanine, in moderation that suits most people, and in a package that offers remarkable health benefits beyond simple stimulation.
Whether you're drawn to oolong for its complex flavours, its traditional craftsmanship, or its gentle energy, it deserves a place in your home and your routine. Like the furniture you choose to surround yourself with, the tea you drink becomes part of the fabric of your daily life—a small, consistent pleasure that adds up to something meaningful.
We'd love to hear from you: Do you have a favourit
e oolong tea? How do you brew it, and where in your home do you enjoy it most? Share your tea stories with our community in the comments below.