What is the unhealthiest tea to drink?

The Unhealthiest Teas You Should Avoid

While tea is often praised for its calming effects and potential health perks, not all teas are safe to sip. With over 2 billion cups consumed daily worldwide, tea ranks as the most popular non-alcoholic drink—but some varieties can do more harm than good.

Among the most concerning is comfrey tea. Often marketed for its supposed healing properties, comfrey contains pyrrolizidine alkaloids—substances linked to liver damage and even cancer when consumed regularly. Health authorities strongly advise against drinking it.

Another risky brew is kava kava tea, derived from the kava plant. While traditionally used in Pacific Island cultures for relaxation, it has been tied to severe liver toxicity. Several countries have banned or restricted its sale due to safety concerns.

On the other end of the spectrum, common black tea is generally safe in moderation—but excessive consumption can lead to issues due to its high caffeine and tannin content. Too much may cause insomnia, digestive upset, or interfere with iron absorption, especially when consumed with meals.

The key to healthy tea drinking lies in knowing what’s in your cup. Stick to well-researched, reputable sources and avoid herbal infusions with little scientific backing or known risks. Just because it’s natural doesn’t mean it’s safe.

Ultimately, the unhealthiest tea is one that’s consumed without awareness. Whether you prefer green, chamomile, or a classic English breakfast, mindfulness matters. When in doubt, consult a healthcare provider before making any herbal tea a daily habit.