Quick answer. Kalmegh (Andrographis paniculata), the "king of bitters", is an Ayurvedic herb traditionally used for fevers, colds, digestion and the liver. Its strongest modern evidence is for the common cold: a 2017 review of 33 trials found it may ease cough and sore throat and shorten symptoms, though the studies were low-quality. It's generally well tolerated but should be avoided in pregnancy, and used cautiously if you have an autoimmune condition or take regular medicines.
Sooner or later, an Indian household runs into kalmegh — a relative presses a spoon of shockingly bitter churna on you for a cold, a shop hands you "andrographis" tablets for "low immunity", or a YouTube vaidya swears it cleanses your liver. So what does it actually do, how much of its reputation holds up in research, and is it safe daily or in pregnancy? This guide separates kalmegh's one well-evidenced job from claims that are still only tradition or lab work, gives realistic doses, and names plainly who should not take it — without overpromising.
What is kalmegh (Andrographis paniculata)?
Kalmegh (Andrographis paniculata) is a slender, intensely bitter annual herb native to India and South Asia. In Sanskrit it is Bhunimba ("neem of the ground"), and across India it also goes by kirayat, bhui-neem and maha-tita, the "king of bitters".
Its bitterness comes mainly from andrographolide, its principal active diterpenoid. In Ayurveda, kalmegh is a classic tikta (bitter) and deepana–pachana (digestion-kindling) herb traditionally used for jvara (fever), kamala (jaundice), worms, the liver and the skin, which is why it fills so many traditional "liver" tonics. That framework is traditional, not a modern diagnosis; modern research has looked hardest at one use, the common cold, where we start.
Kalmegh benefits, according to research
Here is what human trials show, from strongest to most preliminary.
- Common colds and respiratory symptoms (the strongest evidence). A 2017 systematic review of 33 randomised trials and over 7,000 people found that, versus placebo, Andrographis paniculata was linked to less cough and sore throat, and (versus usual care) a shorter cold and quicker recovery [1]. The reviewers stressed the trials were low-quality and inconsistent, so this is encouraging rather than settled, and never a reason to skip antibiotics your doctor prescribes.
- Rheumatoid arthritis (a single-trial signal). In one 14-week trial of 60 people with active rheumatoid arthritis, a standardised andrographis extract was linked to fewer tender and swollen joints than placebo, a possible "natural complement" needing larger, longer studies to confirm [2]. Not a substitute for prescribed arthritis care.
- Ulcerative colitis (an early gut-inflammation signal). In an 8-week trial of 223 adults with mild-to-moderately active ulcerative colitis, a higher-dose andrographis extract led to more clinical improvement than placebo, while a lower dose did not [3]. An early signal that needs confirming, never a reason to self-medicate or change care for a serious gut condition.
Important: most of these studies are small, short-term, single trials — or, for colds, admittedly poor quality. Read the picture as suggestive, not definitive.
What about the liver, immunity and blood sugar?
Kalmegh's grandest reputations are also its least proven.
- Liver. Kalmegh is one of India's most famous "liver" herbs and fills a large share of traditional liver tonics. But the support is mostly lab and animal work plus long traditional use; no solid human trial shows it reverses liver disease or jaundice. See it as traditionally used to support the liver, not a remedy. If fatty liver is your concern, our round-up of the Ayurvedic herbs studied for fatty liver puts the evidence in context.
- Immunity. Kalmegh is traditionally described as an immunomodulator. That label is traditional and regulatory, not a measured outcome; the fair claim is that it may support the body during a cold, not that it "boosts immunity". Its close cousin giloy (guduchi) sits in the same bracket.
- Blood sugar. Most blood-sugar data come from animals. Read it as a caution, not a benefit: kalmegh may lower blood sugar and could add to diabetes medicines' effect — covered below.
How to take kalmegh: form, dose, timing
Kalmegh comes as loose churna, standardised tablets or capsules, and in syrups and kadhas. There's no single "correct" dose — it depends on the form, your age and your reason for using it.
| Form | Typical adult range | Best taken with | Notes |
|---|---|---|---|
| Churna (powder) | ~1–3 g/day | Warm water or honey | Very bitter; take after food |
| Tablet / capsule (standardised) | ~30–60 mg andrographolide/day; studied up to ~340 mg extract/day | Plain water | Most consistent dosing |
| Syrup / kadha | As per label | On its own | Often blended with other herbs |
Dosage varies by age, body type (prakriti) and condition; the ranges above are from traditional practice and modern reference, so yours may differ. Consult a qualified practitioner before starting.
Reference sources consider oral kalmegh likely well tolerated at up to about 340 mg of extract a day for up to a year; for long-term daily use, get a practitioner's guidance, not indefinite self-dosing. It's bitter and can irritate the stomach, so take it after food.
When NOT to use kalmegh — cautions
- Pregnancy & lactation: Avoid. Kalmegh has traditionally been considered able to bring on a miscarriage, and there isn't enough safety data for either pregnancy or breastfeeding.
- Trying to conceive: Best avoided by either partner. Animal studies hint it may interfere with fertility, although this hasn't been shown in humans [6].
- Autoimmune conditions & immunosuppressants: Kalmegh modulates immune activity, and its effect in autoimmune disease isn't fully understood (one rheumatoid-arthritis trial even found benefit). The safe rule isn't "never" — it's consult your doctor first, especially if you take immune-suppressing medicines.
- Drug interactions: Kalmegh may add to blood-pressure drugs, blood thinners and antiplatelets, and diabetes medicines, and may interact with some medicines processed by the liver. If you take any regular medication, clear it with your doctor first.
- Allergy: Rare allergic reactions, including anaphylaxis, have been reported. Stop and seek care if you notice rash, swelling or breathing difficulty.
- Everyday side effects: Usually mild: a bitter or altered taste, headache, tiredness, dizziness, and stomach upset or loose stools.
- Quality & species: Buy correctly identified, lab-tested A. paniculata from a reputable source. Our guide to choosing an Ayurvedic supplement walks through what to check.
Reassuringly, a 2021 safety review found serious side effects from oral andrographis are very rare [4], and a 2022 analysis noted most serious events on record involved injectable andrographolide rather than the oral herbal forms people actually take [5].
If you are managing a chronic condition or taking prescription medication, please consult your doctor before starting any new supplement.
Our take: how kalmegh fits a modern Indian routine
In a real Indian routine, kalmegh earns its place as a short-course bitter at the first scratch of a seasonal cold or sore throat — after food, for a week or two, not a year-round daily habit unless a practitioner suggests otherwise. Pair it with rest, warm fluids and sleep, which do most of the heavy lifting in a cold.
If you'd rather have a daily, ready-made option for everyday immunity, KayaSuddhi's immunity range pair giloy, tulsi, amla, vitamin C and zinc — note they do not contain kalmegh. For more, see our complete guide to Ayurvedic immunity and the Ayurvedic herbs studied for cold and flu.
Results may vary. Not intended to diagnose, treat, cure or prevent any disease. Consult your physician.
Frequently asked questions
Is kalmegh good for the liver?
Kalmegh is one of India's best-known "liver" herbs, but human evidence is limited, mostly lab and animal studies plus long traditional use, with no clinical trial showing it reverses liver disease or jaundice. See it as traditionally used to support the liver; if you have a liver condition, check with your doctor first.
What are the side effects of kalmegh?
Kalmegh is usually well tolerated. Common side effects are mild: a bitter or altered taste, headache, tiredness, dizziness, and stomach upset or loose stools. Rare allergic reactions, including anaphylaxis, have been reported — stop and seek care if you notice rash, swelling or breathing difficulty. A 2021 safety review found serious effects from oral andrographis are very rare.
Who should not take kalmegh?
Avoid kalmegh if you are pregnant, breastfeeding, or trying to conceive. Anyone with an autoimmune condition, or taking immunosuppressants, blood thinners, blood-pressure or diabetes medicines, should consult their doctor first, because kalmegh can modulate immune activity and may add to those medicines' effects. If you have any chronic condition or take regular medication, get medical advice first.
Does kalmegh help with cold and cough?
This is kalmegh's best-evidenced use. A 2017 review of 33 trials and over 7,000 people found it may ease cough and sore throat and shorten a cold versus placebo or usual care [1]. The reviewers cautioned the studies were low-quality, so think of it as a supportive measure during a cold, not a quick fix.
Sources
- Hu XY, Wu RH, Logue M, et al. Andrographis paniculata for symptomatic relief of acute respiratory tract infections in adults and children: a systematic review and meta-analysis. PLoS One. 2017;12(8):e0181780.
- Burgos RA, Hancke JL, Bertoglio JC, et al. Efficacy of an Andrographis paniculata composition for the relief of rheumatoid arthritis symptoms: a prospective randomized placebo-controlled trial. Clin Rheumatol. 2009;28(8):931–946.
- Sandborn WJ, Targan SR, Byers VS, et al. Andrographis paniculata extract (HMPL-004) for active ulcerative colitis. Am J Gastroenterol. 2013;108(1):90–98.
- Worakunphanich W, Thavorncharoensap M, Youngkong S, et al. Safety of Andrographis paniculata: a systematic review and meta-analysis. Pharmacoepidemiol Drug Saf. 2021;30(6):727–739.
- Frontiers in Pharmacology safety meta-analysis of Andrographis paniculata (oral vs injectable preparations), 2022.
- Akbarsha MA, et al. Antifertility effect of Andrographis paniculata in male albino rats/mice.
- Memorial Sloan Kettering Cancer Center. Andrographis — About Herbs.
- WebMD / RxList. Andrographis.
KayaSuddhi is an Ayurvedic D2C brand based in Delhi NCR.
Educational use only — not medical advice. These statements have not been evaluated by AYUSH or FSSAI as treatment claims. KayaSuddhi products are purely herbal and not intended to diagnose, treat, cure, or prevent any disease. Results may vary. Please consult your physician or a qualified BAMS-certified Ayurvedic practitioner before starting any new supplement — especially if you are pregnant, breastfeeding, on prescription medication, or managing a chronic condition.
About this content. This article is for educational purposes only and is not medical advice. The statements have not been evaluated by AYUSH or FSSAI as treatment claims. KayaSuddhi products are not intended to diagnose, treat, cure, or prevent any disease. Please consult a qualified healthcare provider or BAMS-certified Ayurvedic practitioner before starting any new supplement, especially if you are pregnant, lactating, on prescription medication, or managing a chronic condition.
Written & researched by
The KayaSuddhi Team
We are a small team of Ayurveda writers, researchers and reviewers in Delhi NCR. We track the health questions real people are asking, read the latest studies, and turn them into honest, practical guides — so you can make informed choices, not follow hype.
