Punarnava (पुनर्नवा)

Punarnava at a glance

Botanical name	Boerhavia diffusa
English	Red spiderling, spreading hogweed
Hindi	Gadahpurna, santhi, sabuni
Meaning of the name	“That which renews again” (punar + nava)
Part used	Mainly root; also whole plant and leaves
Taste (rasa)	Sweet, bitter, astringent
Potency (virya)	Heating (ushna)
Post-digestive effect (vipaka)	Sweet (madhura)
Dosha	Balances all three, especially Kapha and Vata
Classical formulas	Punarnavadi Mandura, Punarnavasava, Punarnava Guggulu, Punarnavashtaka Kwath

Why it is called the herb that renews

Punarnava is a small creeping weed with pinkish-red flowers that grows almost everywhere in India — in fields, along roadsides and in wasteland. Each summer the plant dries out, and with the first rains it sprouts fresh green again. Its Sanskrit name, “the one that becomes new again”, describes this cycle, and Ayurveda says it renews the body in the same way, especially when it is swollen and heavy.

In the monsoon the plant is easy to recognise: a sprawling, many-branched stem, often reddish, with pairs of unequal oval leaves and clusters of tiny pink to purple flowers. Its sticky fruits cling to clothing and animal fur, which helps it spread. The thick, tapering root is the part most valued in medicine, and it is usually collected after the rains, when the plant is fully grown.

Classical texts sometimes distinguish a red (rakta) and a white (shveta) punarnava, and there has long been confusion between Boerhavia diffusa and the related Trianthema portulacastrum. Today most products use Boerhavia diffusa.

How Ayurveda understands punarnava

The Charaka Samhita lists punarnava among herbs that relieve swelling (shothahara) and that promote urine flow. In Ayurvedic terms:

• Kapha: its bitter, astringent taste and warm potency reduce heaviness and fluid accumulation — the qualities of excess Kapha dosha.
• Vata: its sweet post-digestive effect and warmth are considered balancing.
• Pitta: in moderate doses it is generally tolerated, though its heating potency calls for care.

It is also described as kindling agni, the digestive fire, and as a rasayana, a rejuvenative for long-term vitality. See Prakriti, the body constitution for how doshas guide the choice of herbs.

Traditional uses

In Ayurvedic practice punarnava is used for:

1. Swelling and fluid retention (shotha) — its best-known use, often in formulas such as Punarnavadi Mandura or Punarnava Guggulu.
2. Urinary health — as a mild diuretic (mutrala) to support urine flow.
3. Liver support — in formulas for jaundice and sluggish digestion.
4. Joint stiffness and inflammation — usually combined with guggulu.
5. Anaemia and weakness — in iron-containing preparations such as Punarnavadi Mandura.
6. As food — the tender leaves are cooked as a green (santhi saag) in parts of Bihar, Jharkhand and other regions.

In most of these uses punarnava is combined with other herbs rather than taken alone; classical Ayurveda rarely relies on a single plant for a complex condition.

What modern research says

Punarnava contains compounds called punarnavine (an alkaloid), rotenoids (boeravinones), flavonoids and other substances. Laboratory and animal studies report diuretic, anti-inflammatory, liver-protective, antioxidant and immunomodulating effects. A few small human studies of Ayurvedic formulas containing punarnava have looked at kidney function, liver disease and anaemia, with some encouraging results.

However, the evidence is preliminary. Most studies are in animals or cells, human trials are small and often test multi-herb formulas, and there is no good proof that punarnava treats kidney disease, liver disease or heart failure. Claims that it “cures” kidney failure or “reverses” fatty liver are not supported.

How to use punarnava

• Root powder (churna): a common traditional amount is about 1–3 g a day with warm water, for adults.
• Decoction (kwath): the dried root boiled in water and reduced, taken warm.
• Classical formulas: Punarnavasava (a fermented liquid), Punarnavadi Mandura (with iron), Punarnava Guggulu and Punarnavashtaka Kwath, used as directed by a practitioner.
• Capsules or tablets: choose reputable brands tested for heavy metals and contaminants.

Many practitioners recommend taking it in the morning or early afternoon rather than at night, because of its diuretic action. Use it for limited periods, watch how your body responds, and do not combine several diuretic herbs. Punarnava is often paired with guduchi (giloy) or triphala in practitioner-led formulas.

Safety and side effects

Punarnava is generally well tolerated in usual amounts, but:

• Swelling is a symptom, not a disease. Swollen legs, puffy eyes or a swollen abdomen can be signs of heart failure, kidney disease, liver disease, thyroid problems, blood clots or medication side effects. Always see a doctor before using any herb for swelling.
• As a diuretic, it may add to the effect of water pills (such as furosemide), blood-pressure medicines and lithium, and could cause dehydration or low potassium or sodium.
• Avoid in pregnancy and breastfeeding; safety has not been established.
• People with kidney disease, heart disease or diabetes, or who take regular medicines, should use it only with their doctor’s approval.
• Large doses can cause nausea, vomiting or loose stools.
• Herbal products may be adulterated or contaminated; buy from reputable sources.

This page is for general information only. Talk to a qualified doctor or Ayurvedic practitioner before using punarnava, especially if you are pregnant, breastfeeding, have a medical condition, or take regular medicines. For another classic Ayurvedic fruit used for elimination, see haritaki.