Tulsi (Holy Basil) Extract: Benefits, Dose and Cautions
Tulsi, or holy basil, is Ocimum tenuiflorum. Human trials are small and short, mostly on stress and blood sugar markers. What a 2.5% ursolic acid figure means, typical amounts and who should check with a doctor.
Part of How to choose a greens powder in India. Related: Daily Greens, a daily nutrition supplement.
Akanksha Singh
Short answer: tulsi, or holy basil (Ocimum tenuiflorum, also written Ocimum sanctum), is the plant grown in courtyards across India and drunk as tea. As a supplement it is used as an adaptogen, a plant taken for everyday stress. Human research exists but is small: a 2017 review found 24 human studies, most short and of modest quality, with results that lean positive on stress and blood sugar markers. Typical supplement amounts are 300 mg to 2 g of extract or leaf a day.
Last updated: October 2026.
Key takeaways
- Tulsi is holy basil, a different plant from the sweet basil used in pasta.
- Extracts are often standardised to ursolic acid, eugenol or total polyphenols. The figure tells you about consistency, not strength of effect.
- Human trials are small, short and mostly from India. They support tulsi as a reasonable everyday botanical, not a treatment.
- Ask a doctor first in pregnancy, when trying to conceive, before surgery, or if you take blood-thinning or blood-sugar medicine.
What is tulsi?
Tulsi is a woody herb in the mint family, native to the Indian subcontinent, with a long place in Ayurveda and in daily worship. Two common types are Rama tulsi, with green leaves, and Krishna tulsi, with purple leaves. Both are Ocimum tenuiflorum. Vana tulsi is a related species, Ocimum gratissimum. The leaves carry essential oils, chiefly eugenol, plus triterpenes such as ursolic acid and a range of polyphenols.
What does the research on tulsi show?
A systematic review by Jamshidi and Cohen in 2017 gathered 24 human studies of tulsi. Across them, tulsi was associated with favourable changes in measures of stress, blood glucose and blood lipids, and was well tolerated. The authors were clear about the limits: most trials were small, short, and varied in what form of tulsi they used and how they measured results.
| Area | What studies looked at | How strong |
|---|---|---|
| Everyday stress | Self-reported stress and anxiety scores over 6 to 8 weeks | Small trials, positive leaning |
| Blood sugar | Fasting glucose in people with raised levels | Small trials, mixed quality |
| Blood lipids | Cholesterol and triglycerides | Few trials |
| Thinking and attention | Reaction time and attention tasks | Very few trials |
None of this makes tulsi a treatment for any condition. In India it is sold as a food or Ayurvedic ingredient, and food supplements may not claim to treat or prevent disease.
What does "2.5% ursolic acid" mean on a tulsi label?
It means the extract has been tested to contain at least 2.5% ursolic acid by weight, so 100 mg of extract carries 2.5 mg. Standardising to a marker compound keeps batches consistent. It does not prove ursolic acid is what produces any effect, and different studies standardised to different markers, so a figure on one product cannot be matched directly to a particular trial. How standardisation works.
How much tulsi do people take?
- Tea: a few fresh leaves or a teaspoon of dried leaf steeped in hot water, once or twice a day.
- Leaf powder: commonly 1 to 2 g a day.
- Extract: trials used roughly 300 mg to 1 g a day, depending on the concentration. Follow the label.
Is it safe to take tulsi every day?
As a tea or culinary herb, tulsi has a long record of daily use. In short trials of extracts, side effects were uncommon and mild, mostly nausea. Check with a doctor first if you:
- are pregnant, breastfeeding or trying to conceive; animal studies have raised questions about fertility at high doses;
- take medicine for blood sugar, because the effects may add up;
- take blood thinners or have surgery planned, because eugenol may slow clotting;
- have a thyroid condition.
What to check on a tulsi supplement
- The species: Ocimum tenuiflorum or sanctum, not just "basil".
- Leaf, powder or extract, and for an extract, the ratio or standardisation figure.
- Named on its own line, with an amount you can see.
- A batch test for heavy metals and microbes, as for any dried leaf. How to read a certificate of analysis.
Tulsi and ashwagandha
Both are called adaptogens and often appear together. They are different plants with different research: ashwagandha has the larger and more consistent body of trials on stress and sleep, while tulsi's is smaller. Ashwagandha powder: root vs extract, dose and who should avoid it.
Where SWATVA stands
Daily Greens includes tulsi extract standardised to 2.5% ursolic acid, named on its own line in the ingredient ledger, alongside ashwagandha root extract. Research on tulsi as an ingredient does not establish any outcome for the finished blend, and we do not claim one. Every batch is tested before release.
The first run is 55 pouches. Pre-ordering takes four minutes and nothing is charged.
Sources
- Jamshidi N, Cohen MM, 2017. The clinical efficacy and safety of tulsi in humans: a systematic review of the literature. Evidence-Based Complementary and Alternative Medicine.
- Cohen MM, 2014. Tulsi, Ocimum sanctum: a herb for all reasons. Journal of Ayurveda and Integrative Medicine.
Tulsi: what people search, answered
Tulsi benefits
Tulsi (holy basil, Ocimum sanctum) is an adaptogen in Ayurveda. Its active compounds include eugenol, ursolic acid and rosmarinic acid. Small human trials have looked at stress, sleep quality and blood sugar, with encouraging but early results.
Tulsi for immunity, cold and cough
Tulsi chai and kadha are household habits during colds. A few small studies show changes in immune markers, but no good trial shows tulsi prevents or shortens colds. Enjoy it as a habit, not a cure.
Tulsi for stress and anxiety
The best-studied modern use. Trials using 500 mg to 1.2 g of extract for six to eight weeks reported lower stress scores. Sample sizes are small.
Tulsi side effects
Generally safe as food. As an extract, avoid during pregnancy and when trying to conceive, and ask your doctor if you take diabetes medicine or blood thinners, since tulsi may add to their effect.
Tulsi leaves vs tulsi extract vs tulsi drops
Fresh leaves and tea are mild. Drops vary widely in strength. A standardised extract states its marker compound, so you know what a dose contains.
Tulsi water on empty stomach
A common morning ritual. It is fine for most people, but there is no evidence that empty stomach timing adds anything.
Tulsi ke fayde aur nuksan (Hindi)
Tulsi ko Ayurveda mein tanaav aur sardi-khaansi ke liye istemaal kiya jaata hai. Research tanaav par sabse zyada hai, par chhoti hai. Pregnancy, diabetes ki dawa ya blood thinner ke saath doctor se poochein.
Get tulsi in Daily Greens
Daily Greens includes a standardised tulsi extract with ashwagandha, amla, turmeric and ginger, plus grass juice powders, spirulina, a spore probiotic and a B12 and D premix. Your morning tulsi, without the kadha. First batch: only 55 pouches. See Daily Greens or pre-order free.
Get tulsi in Daily Greens, with 22 more named ingredients
| Grass juice powders, spirulina, chlorella, moringa | The greens most busy diets miss, in one scoop |
| Amla, ashwagandha, tulsi, turmeric, ginger | Standardised extracts with the figure on the label |
| Spore probiotic + PHGG and inulin | A daily gut routine that keeps without a fridge |
| B12, vitamin D, iodine, selenium | The gaps a plant base cannot fill |
| 23 ingredients, all named | No proprietary blend, every batch tested. Mango and lime. |
First batch: only 55 pouches. Pre-ordering is free, and nothing is charged until we email you the price. If you take prescribed medicine or are pregnant, check the ingredient list with your doctor first.
Common questions
Is tulsi the same as basil?
No. Tulsi, or holy basil, is Ocimum tenuiflorum (also called Ocimum sanctum). Sweet basil used in Italian cooking is Ocimum basilicum, a different plant.
How much tulsi can I take a day?
As tea, a few fresh leaves or a teaspoon of dried leaf once or twice a day. As a supplement, trials used roughly 300 mg to 1 g of extract a day. Follow the label.
Who should not take tulsi supplements?
Ask a doctor first if you are pregnant, breastfeeding or trying to conceive, take blood-sugar or blood-thinning medicine, have a thyroid condition or have surgery planned.
Can I take tulsi every day?
As food or tea, yes for most people. As an extract, avoid it in pregnancy and check with your doctor if you take diabetes medicine or blood thinners.
Is tulsi good for stress?
Small trials of tulsi extract over six to eight weeks reported lower stress scores. The research is early.
Tulsi drops or extract, which is better?
A standardised extract states its marker compound, so the dose is known. Drops vary widely.
Which SWATVA product has tulsi?
Daily Greens, with ashwagandha, amla, turmeric and ginger.
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