Does mullein tea have caffeine? No — a plain cup of mullein tea is naturally caffeine-free. Mullein tea is a herbal infusion, or tisane, made from the leaves and flowers of the mullein plant (Verbascum), not from the caffeinated tea plant Camellia sinensis. Because the caffeine in true tea comes from that one plant, an herb like mullein contains essentially none, which is why it is a common late-day or evening cup.
Does mullein tea have caffeine? The short answer
The short answer is that mullein tea does not contain caffeine in any meaningful amount. It sits in the same group as chamomile, peppermint, rooibos and other caffeine-free herbal infusions: drinks brewed from herbs, leaves, roots or flowers rather than from the tea plant. In everyday language we call all of these "tea," but botanically a herbal infusion is a tisane, and that naming quirk is the source of most of the confusion. If you want the full picture of what that category covers, see our guide to what herbal tea is. For the caffeine question, the takeaway is simple: is mullein tea caffeine free? On its own, yes.
It is an easy point to get wrong because "tea" in casual use means any hot, steeped drink. But the caffeine in a cup is tied to the plant it came from, not to the word on the box. Mullein, chamomile and peppermint are all "teas" in the loose sense and all caffeine-free; green and black "teas" share the same word but come from a caffeinated plant. Sorting drinks by their plant, rather than by the label, is the quickest way to know what has caffeine.
How much caffeine is in mullein tea?
If you want a number, the mullein tea caffeine content of a pure cup is effectively 0 mg — far below the roughly 95 mg in a cup of brewed coffee, or the 20-70 mg range you would expect from green or black tea. Because mullein contains no caffeine to start with, there is no realistic brewing method, steep time or leaf quantity that turns a single-herb mullein cup into a caffeinated one. Any trace you could theoretically measure would come from cross-contamination in packaging, not from the herb itself, and would be too small to have a noticeable effect. Keep these figures loose: exact caffeine levels always depend on the specific product and how it is brewed.
Why there is no caffeine in mullein tea
Caffeine is a natural compound that only a handful of plants produce, most famously the coffee plant, the cacao tree, yerba mate and the tea plant, Camellia sinensis. Every true tea — green, black, white, oolong and pu-erh — comes from the leaves of that single species, and that is where the caffeine in your cup originates. Mullein is an entirely different plant, so there is no botanical source of caffeine in the first place. That is the whole reason there is essentially no caffeine in mullein tea: you cannot brew out something the plant never contained.
This is the same logic behind every naturally caffeine-free herbal cup. It also means mullein is different from decaffeinated tea. Decaf tea starts as real Camellia sinensis and has most of its caffeine removed through processing, so a trace usually remains. Mullein never had any to remove. If you are curious which drinks carry caffeine and which do not, our overview of whether tea contains caffeine walks through the difference between true teas and tisanes, and our guide to caffeine-free tea explains the wider category mullein belongs to.
One practical follow-up people often ask: does steeping mullein for longer add caffeine? No. A longer steep pulls more color, flavor and plant compounds into the water, but it cannot create caffeine that was never in the leaf. A weak cup and a strong cup of pure mullein are both caffeine-free.
A quick side-by-side makes the contrast clear. The figures below are rough, hedged ranges per 8 oz (about 240 ml) cup and vary widely with the leaf, the steep time and how the drink is made:
| Tea type | Made from | Typical caffeine per cup |
|---|---|---|
| Mullein (herbal tisane) | Mullein leaves and flowers | None — caffeine-free |
| Green tea | Camellia sinensis | Roughly 20-45 mg |
| Black tea | Camellia sinensis | Roughly 40-70 mg |
As the table shows, the gap is not simply "a little less caffeine." Mullein has none to speak of, while any true tea from Camellia sinensis always carries some. Treat the milligram ranges as ballpark figures rather than precise measurements.
For context, that puts mullein in the same bracket as other popular caffeine-free steeps. A pure cup will not register the way even a lightly brewed green tea does, so if you have switched to mullein specifically to cut caffeine, a single-herb version does exactly that. The only variable that changes the answer is the ingredient list, which is why the blend check below matters.
The one caveat: mullein blends that add caffeine
There is a single thing worth checking. Plain, single-herb mullein tea is caffeine-free, but some blended products mix mullein with other ingredients — and if a blend adds green tea, black tea, white tea or yerba mate, it will no longer be caffeine-free. In that case the mullein tea caffeine content depends entirely on how much of the caffeinated ingredient is in the mix, which is hard to pin down from the packet alone.
The fix is easy: read the ingredient list. If it names only mullein (sometimes listed as Verbascum) and perhaps other herbs such as peppermint or licorice root, the cup is caffeine-free. If you spot "green tea," "black tea," "camellia sinensis" or "mate," treat it as a caffeinated blend, and if caffeine matters to you, look for a version clearly labeled herbal or caffeine-free. When a label is vague, it is reasonable to assume a small, uncertain amount rather than none.
Who drinks mullein tea, and when
Because it has no caffeine, mullein tea is often chosen as an evening or late-afternoon drink, when many people prefer to avoid a stimulant. It is equally at home earlier in the day for anyone cutting back on caffeine or simply wanting a warm, mild herbal cup. The caffeine-free nature is really the practical appeal: you can enjoy it without the alertness or sleep effects an equivalent black tea or coffee might bring. Some drinkers add a little honey, a slice of lemon or a complementary herb such as peppermint, none of which change the caffeine picture.
If you actually want a caffeine lift, mullein on its own will not provide one — that is not a flaw, it is the point. Some people who like the taste but want a little energy in the morning make their own blend by adding a caffeinated tea, which of course reintroduces caffeine in whatever amount they add. For most drinkers, though, the appeal of a straight mullein cup is precisely that it can be enjoyed close to bedtime without a second thought about staying awake.
This article is only about caffeine, so we will not wander into the herb's traditional uses — if you want that side of the story, see our guide to mullein tea and its commonly discussed uses. Here, the point is simply that the empty caffeine column is what makes it such a flexible, any-hour choice.
A light note on safety
Caffeine-free does not automatically mean right for everyone. Herbs can interact with medication, and some are best approached cautiously during pregnancy or breastfeeding, so if any of that applies to you it is worth a quick word with your own doctor or pharmacist before making mullein tea a regular habit. Responses vary from person to person, and this is general information, not medical advice.