Kalmegh Dosage: How Much to Take and How to Take It
Bitter powder, andrographolide-standardized extract, or capsules: here is how kalmegh is taken, with dose and duration guidance from the rare clinical trials available.
Kalmegh (Andrographis paniculata) is one of the rare Ayurvedic herbs whose dosage rests, at least for one specific use, on real clinical trials: those conducted on the common cold. For other traditional uses (liver, digestion), the guidelines remain empirical and should be validated with a professional.
Common forms and their usual doses
| Form | Usual dose | When and how |
|---|---|---|
| Whole-herb powder | 500 mg to 1 g per day | With water, away from meals — the bitter taste is marked |
| Standardized extract (andrographolides) | Often 200 to 400 mg of extract per day | In 1 to 2 doses, a 1-to-2-week course |
| Capsules | Per the manufacturer's dosage | With a meal to reduce the bitterness felt |
These doses broadly match those used in the reference systematic review on the common cold (Coon & Ernst, 2004, Planta Medica), already presented in our article kalmegh: they concern short 1-to-2-week courses starting at the first symptoms, not continuous use.
Why the course should not exceed two weeks
A study in male rats found that prolonged oral administration of andrographis leaf powder, at 20 mg per day for 60 days, halted spermatogenesis and altered reproductive gland tissue (see the record on PubMed). Other work, using different doses and protocols, did not find this effect on fertility — the literature therefore remains inconsistent. This signal, even an uncertain one, is enough to justify that kalmegh be taken as a short, occasional course, never continuously, especially in men trying to conceive.
How to adjust use to the goal?
For an emerging cold, the short 1-to-2-week course matches the studied protocols. For more traditional liver or digestive use, no clinical trial sets a reference duration: caution requires limiting these uses to a few weeks too, reassessed with a professional, rather than continuing year-round like a foundational rasayana.
Precautions
As detailed in our article kalmegh dangers and precautions, kalmegh calls for particular caution when trying to conceive (an effect on male fertility reported in some animal studies), during pregnancy and breastfeeding (avoid for lack of human data), with autoimmune disease, and with anticoagulant treatment. Stopping at least two weeks before scheduled surgery is recommended as a precaution. For general guidance, see our safety and precautions guide.
Your questions about kalmegh dosage
What is the dose of kalmegh for a cold?
Available clinical trials used andrographolide-standardized extracts, often 200 to 400 mg per day, in a 1-to-2-week course starting at first symptoms. That is the best-documented dosage for this herb.
Can kalmegh be taken continuously year-round?
No. Both clinical trials and tradition point to short 1-to-2-week courses. Prolonged use has no justification and is linked, in some animal studies, to a possible effect on male fertility.
Is kalmegh risky for fertility?
A rat study found halted spermatogenesis after 60 days of daily use, but other work did not find this effect at different doses. As a precaution, avoid long courses when trying to conceive.
How can the bitter taste of kalmegh be softened?
Capsules taken with a meal reduce the perceived bitterness, which is very marked for pure powder. That is the simplest form for a short daily course.
Is medical advice needed before taking kalmegh?
Yes, especially with autoimmune disease, anticoagulant treatment, pregnancy, breastfeeding, or when trying to conceive, for lack of sufficient safety data for these situations.
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