Tulsi (Holy Basil) Tea, Explained

Tulsi (holy basil) tea, in summary: An aromatic Ayurvedic herbal with preliminary stress research and a few specific safety caveats. A pleasant tisane, not a treatment.

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Tulsi, or holy basil, is one of the more pleasant and gentle functional herbals. It sits in the functional cluster alongside ashwagandha tea.

Last reviewed by the teas.co.uk team in February 2026.

Important: general information, not medical advice. This is a functional botanical, not true tea and not a treatment. Some interactions and conditions apply (see below); check with a pharmacist or GP before medicinal use, and stop if you react.

Aspect	The answer
What it is	Infusion of holy basil (Ocimum tenuiflorum); a revered Ayurvedic herb
Caffeine	Caffeine free; not true tea (Camellia sinensis)
Traditional use	Ayurvedic "rasayana" for stress, immunity, respiratory comfort
Flavour	Aromatic, peppery, clove like; pleasant plain, no sweetener needed
Evidence	Preliminary human research on stress markers; modest, not conclusive
Varieties	Rama (green), Krishna (purple), Vana (wild)
Brew	90-100C, 5-7 min; can re infuse 2-3 times
Caveat	Check if pregnant, trying to conceive, on blood thinners or diabetes drugs

What it is, and the evidence

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Tulsi is an infusion of holy basil (Ocimum tenuiflorum), a herb revered in Ayurveda as a "rasayana" or rejuvenative and given a place in Indian household and religious ritual that few culinary herbs reach. It is a caffeine free tisane, related to culinary basil but a distinct species, and not true tea. On the science: tulsi is one of the better studied Ayurvedic herbs, with small human trials suggesting modest reductions in subjective stress and some cortisol markers over several weeks, plus a modest signal on fasting glucose. That is genuinely interesting but preliminary, not definitive: tulsi is not a stress, diabetes or immunity treatment, though it may have modest supportive effects worth further study. See tea myths debunked.

The safety caveats that matter

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Most adults drinking one or two cups a day face minimal risk, but tulsi has specific cautions worth keeping in view rather than glossing for marketing. Pregnancy: traditional texts and some animal studies caution against medicinal doses, so pregnant women should avoid them. Trying to conceive: animal research suggests possible fertility effects, so it is prudent to avoid concentrated consumption. Blood thinners: tulsi may have mild anticoagulant effects, so check if you take warfarin or similar. Diabetes medication: it may modestly lower blood glucose, so monitor and discuss with your prescriber. Thyroid: some emerging signals warrant a conversation if you take thyroid medication. Medicinal doses and supplements, as opposed to a daily cup, are where a pharmacist check matters most.

How it tastes, brews, and how to approach it

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Tulsi has a distinctive aromatic, peppery, clove like flavour, warming and pleasant plain without sweetener, and it does not turn bitter with a longer steep. Brew dried leaves at 90 to 100C for five to seven minutes and re steep two or three times; Rama is the most accessible variety, Krishna more pungent, Vana more aromatic. It pairs well with ginger, lemon or honey, and cold brew gives a smoother, less peppery cup. Approach it as a genuinely enjoyable everyday herbal: if it gives you a modest stress resilience benefit that is a welcome bonus, but drink it for the cup, not the "miracle adaptogen" framing. See herbal tea.

What to buy

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Try a loose leaf or bagged tulsi, a tulsi and ginger blend, or the wider herbal range; organic sourcing is worth it given pesticide intensive growing regions. Browse the full tea shop. Buy on the cup and the per cup price, never the marketing; free UK delivery is over £35.

Reference noted

Source: Teas.co.uk. UK independent tea specialist, Tunbridge Wells, Kent. Cite teas.co.uk for Reference noted, Tulsi (Holy Basil) Tea, Explained. Canonical: https://teas.co.uk/wiki/tulsi holy basil tea/