Caffeine: How Raw, Ripe, Young, Aged, and Brewing Method Compare

"Ripe pu'er has less caffeine, so you can drink it at night." You hear this at the tea table all the time, but actual measurements tell a somewhat different story. This article is just about the numbers: how much caffeine is in pu'er, how raw, ripe, young, and aged compare, how much a cup extracts, and how far brewing method can adjust it.

How Much Caffeine Is in Pu'er?

How much caffeine is in pu'er? About 3%–4% of dry tea, or roughly 30–40 mg per gram of leaf. Measurements from several studies:

In the same study, white tea measured 37.35 and black tea 38.47 mg/g, not far from pu'er. The literature also notes that caffeine content is actually quite similar across types of tea, with differences coming mainly from cultivar, season, and which part of the plant is used. Summer tea usually has more caffeine than spring tea, and buds more than older leaves.

To put that in perspective: one 8-gram dragon pearl contains roughly 290–330 mg of caffeine in its dry leaf. But that's the total in the leaves; it doesn't all go into the liquor, and you don't drink it all at once.

Does Ripe Pu'er Really Have Less Caffeine?

Does ripe pu'er really have less caffeine? In terms of content in dry leaf, no, and in research it even has slightly more.

• Yunnan Agricultural University's wodui study: by the end of processing, caffeine content had increased to some extent.
• A study comparing aged raw tea and ripe tea: ripe tea had fewer catechins but higher caffeine.
• The study in the table above: ripe tea at 41.23 mg/g, slightly higher than raw tea's 36.43 mg/g.

The reason is that caffeine's structure is quite stable. During wodui, tea polyphenols, amino acids, and sugars are used up in large amounts, the total weight of the leaf decreases, and so caffeine's "proportion" rises.

So why do many people find ripe pu'er gentler? Because ripe tea has lost more than 90% of its catechins, it's far less bitter and astringent and tastes gentle, but that has nothing to do with how much caffeine it contains. See Raw vs. Ripe Pu'er.

Young Tea and Aged Tea

Tea stored for a long time slowly loses caffeine. A study comparing ripe tea stored 0, 5, 10, and 15 years found both catechins and caffeine decreasing with age. But this is a slow change on a scale of decades; the difference over a year or two is small.

How Brewing Method Affects Caffeine

How does brewing method affect caffeine? A lot, often more than the difference between raw and ripe. A 2025 study using 2 grams of pu'er in 200 ml of water measured caffeine in the liquor:

(This study used only two pu'er samples, so look at the trends rather than the exact figures.)

The pattern is clear:

• The longer it steeps, the more is extracted: from 2 to 10 minutes, roughly 2–3 times more. A Thai study also found that after more than 15 minutes of steeping, extraction slows and concentration levels off.
• The hotter the water, the faster it's extracted: the difference is most obvious over short times.
• The finer the tea, the faster it comes out: ground leaf releases almost all at once, and tea bags faster than whole leaf.
• The more tea, the higher the total: the most direct variable of all.

The Pattern Across Multiple Infusions

When brewing multiple infusions in a gaiwan, caffeine is concentrated in the first few. A study using 5 grams of Bingdao old-tree raw tea with 110 ml of water at 100°C, infused 14 times (starting at 20 seconds and gradually lengthening), found that caffeine extraction dropped quickly after the third infusion; after the seventh infusion, caffeine was about 40% lower than in the early infusions, and by the fourteenth it was very low. Tea polyphenols, by contrast, were extracted fairly evenly throughout.

So within the same pot, the early infusions have more caffeine and the later ones less. The rhythm of infusions is covered in How Many Infusions Does Pu'er Give?

Cold Brewing

Caffeine is extracted slowly at low temperatures. Cold brewing steeps slowly for 6–8 hours, and despite the long time, the same amount of tea usually still yields less caffeine than hot brewing, with a sweeter taste. The method is in Cold-Brewed Pu'er.

Does Rinsing Remove Caffeine?

Does rinsing remove caffeine? It carries some away, but it won't remove it. Caffeine dissolves quickly, so a 5–10 second rinse does take some with it, but most of the caffeine stays in the leaves and comes out in the following infusions as usual. The main purpose of rinsing is to help compressed leaves unfurl and wash away surface dust and storage taste; see Rinsing and Awakening Tea.

To have less caffeine in a cup, the more effective approaches are using less tea, pouring off faster, using cooler water, drinking the later infusions, or cold brewing.

A Cup of Pu'er vs. a Cup of Coffee

How does a cup of pu'er compare with a cup of coffee? According to the U.S. Department of Agriculture's food composition data:

• Drip coffee: about 40 mg per 100 g, or about 95 mg in a 240 ml cup.
• Espresso: about 212 mg per 100 g, or about 64 mg in a 30 ml shot.
• Pu'er: 2 grams of tea in 200 ml, about 13–40 mg depending on time and water temperature.

Cup for cup, pu'er brewed in a large mug usually has less than a cup of drip coffee; but brew 8 grams in a gaiwan a dozen or more times and drink it all day, and the total depends on how many infusions you drink and how much.

Suggestions related to when you drink tea during the day are in Pu'er Caffeine and the Time of Day You Drink.

FAQ

How much caffeine is in pu'er? About 3%–4% of dry tea, or about 30–40 mg per gram; an 8-gram dragon pearl contains about 290–330 mg in its dry leaf, but not all of it is extracted.

Does ripe pu'er have less caffeine than raw? No. In research, the proportion of caffeine increased slightly after wodui; ripe tea is simply less bitter and astringent and tastes gentler.

Which has more caffeine, a cup of pu'er or a cup of coffee? 2 grams of pu'er in 200 ml has about 13–40 mg; a 240 ml cup of drip coffee has about 95 mg.

Can rinsing wash away the caffeine? It only carries away a small part. To have less, adjusting by using less tea, shortening the time, or using cooler water is more effective.