Is ashwagandha or holy basil better for stress?

For general stress and tension, ashwagandha is the stronger default because it has more and better-designed human trials showing lower perceived stress and cortisol. Holy basil, or tulsi, has a smaller evidence base but tends to suit stress that comes bundled with low mood or mental fatigue. Neither is a treatment for an anxiety or mood disorder. The most reliable way to choose is to match the herb to your main symptom and trial it for four to eight weeks.

Can you take ashwagandha and holy basil together?

There is no well-documented interaction between the two herbs, and both are traditionally used as adaptogens, so some people do combine them. The practical downside is that taking both at once makes it impossible to tell which is doing the work, and it stacks two herbs that can each affect blood sugar and sedation. It is usually more useful to trial one at a time. If you take medication or have a thyroid condition, ask your prescriber before adding either.

Does holy basil lower cortisol like ashwagandha?

Both are proposed to modulate the stress-hormone axis, but the human evidence is uneven. Ashwagandha has several randomised trials showing meaningful reductions in serum cortisol and perceived stress. Holy basil's effect on cortisol in humans is far less studied, with most support coming from smaller trials and traditional use for stress and mood. So while both are described as cortisol-modulating, ashwagandha is where the stronger clinical signal sits.

Which is better for sleep, ashwagandha or holy basil?

Ashwagandha is the better-studied choice for sleep, with trials reporting improved sleep quality alongside lower stress, and it is often taken in the evening because it can feel mildly sedating. Holy basil is not primarily a sleep herb; its traditional and trial use centres on stress and mood rather than insomnia. If poor sleep is your main complaint, ashwagandha, or a dedicated sleep supplement, is the more evidence-aligned starting point.

What is the best ashwagandha supplement for stress relief?

Choose a single-ingredient, root-only standardised extract such as KSM-66, at the studied dose of around 300 to 600 mg a day, from a brand with third-party testing for identity and contaminants. Root-only extracts have the deepest trial record for stress and cortisol. Avoid mega-dose blends that stack stimulants or sedatives. Our ashwagandha page explains how to match a product to what was actually studied, and the stress guide sets it in context.

ashwagandha

Moderate evidence

Ashwagandha vs Holy Basil for Stress

Ashwagandha vs holy basil for stress: ashwagandha has the deeper trial base for cortisol, holy basil suits stress with low mood. How to choose between them.

August 29, 2026

Updated August 2026

Reviewed by Enoch C., MSc — Research & Editorial

On this page

How each herb is thought to work
What the human evidence shows
What to look for in an ashwagandha supplement for stress relief
Cautions and who should be careful
Sources

For general, everyday stress, ashwagandha is the stronger first choice: it has the deeper and more consistent human evidence for lowering perceived stress and cortisol. Holy basil, or tulsi, is worth trying when stress travels with low mood or mental fatigue. Both are adaptogenic herbs, not quick fixes, and both need a few weeks to judge. If ashwagandha fits your goal, our ashwagandha page and the stress guide explain how to use it.

Adaptogens are herbs proposed to help the body resist and recover from stress by acting on the hypothalamic-pituitary-adrenal (HPA) axis, the system that governs the cortisol response. Ashwagandha (Withania somnifera) and holy basil (Ocimum sanctum, tulsi) are two of the most used, but they arrive at “stress support” from different traditions and with very different depths of evidence.

How each herb is thought to work

Ashwagandha’s active withanolides are proposed to dampen an over-active HPA axis and reduce cortisol output, which lines up with the calmer, slightly sedating feel most people describe. Holy basil contains eugenol, ursolic acid, and other compounds studied for anti-stress and adaptogenic effects, and its traditional use spans stress, mood, and metabolic support. A review of tulsi by Cohen (2014) describes this broad adaptogenic profile, while the NCCIH overview of ashwagandha sets out its use as a stress and sleep support with a caveat that longer-term safety is less certain.

What the human evidence shows

This is where the two separate. Ashwagandha has the deeper clinical base: a randomised, placebo-controlled trial by Chandrasekhar and colleagues (2012) found a high-concentration root extract significantly reduced perceived stress scores and serum cortisol over 60 days, and a later KSM-66 trial by Salve and colleagues (2019) reported reduced stress and morning cortisol. Holy basil’s human evidence is thinner but real: a systematic review by Jamshidi and Cohen (2017) found that across the available clinical studies tulsi improved stress, anxiety-related symptoms, and metabolic markers, while noting the trials were small and varied. The honest read: ashwagandha is better proven for stress and cortisol, holy basil is promising and suits the stress-plus-low-mood picture.

Herb	Main compounds	Best-studied use	Typical dose	Best for
Ashwagandha	Withanolides	Perceived stress, cortisol, sleep (multiple RCTs)	300–600 mg root extract/day	Everyday stress, tension, poor sleep
Holy basil (tulsi)	Eugenol, ursolic acid	Stress with low mood (fewer, smaller trials)	300–600 mg extract/day	Stress paired with low mood or fatigue

What to look for in an ashwagandha supplement for stress relief

Match the product to what was tested. For ashwagandha, the deepest trial record belongs to root-only standardised extracts — KSM-66 and Sensoril are the two most studied — at 300–600 mg a day, standardised to a stated withanolide percentage. Choose a single-ingredient product with third-party testing for identity and contaminants, and skip mega-dose “stress blends” that stack stimulants or sedatives you cannot dose separately. For holy basil, look for a standardised leaf extract stating its dose per serving rather than a raw powder of unknown strength. If everyday stress and tension are your target, our ashwagandha page shows how to read a label against the trials, and the stress guide frames where an adaptogen fits alongside sleep and routine. Name the spec you want — a root-only KSM-66 extract at a studied dose — and let the product page carry the verified specs and retailer link.

Cautions and who should be careful

Both herbs are generally well tolerated short term, with mild stomach upset the usual complaint. Ashwagandha can raise thyroid hormone levels and has rare reports of liver injury, so anyone with a thyroid or liver condition, an autoimmune disease, or a pregnancy should avoid it or seek advice first. Holy basil may lower blood sugar and has traditional cautions around fertility, so people on diabetes medication or trying to conceive should be careful. Both can add to sedatives. Because these are your-money-or-your-life decisions, talk to your prescriber before starting either herb, especially if you take regular medication.

Sources

Chandrasekhar K, et al. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian J Psychol Med. 2012. PMID 23439798
Salve J, et al. Adaptogenic and anxiolytic effects of ashwagandha root extract in healthy adults. Cureus. 2019. PMID 32021735
Jamshidi N, Cohen MM. The clinical efficacy and safety of tulsi in humans: a systematic review of the literature. Evid Based Complement Alternat Med. 2017. PMID 28400848
Cohen MM. Tulsi - Ocimum sanctum: a herb for all reasons. J Ayurveda Integr Med. 2014. PMID 25624701
NCCIH. Ashwagandha. nccih.nih.gov/health/ashwagandha

This article is educational and not medical advice. If you are struggling, please see our get-help page and read our disclaimer. Reviewed by Enoch C.