Herb × Condition

Licorice for Menorrhagia

Sanskrit: Yasshoimadhu | Glycyzrrhiza glabra Linn

How Licorice helps with Menorrhagia according to Ayurveda. Classical references, dosage, preparation methods, and what modern research says.

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Licorice for Menorrhagia: Does It Work?

Does Licorice (Yashtimadhu) help with menorrhagia (Asrigdara)? Yes, in the specific role of cooling the inflamed, Pitta-driven heat that drives most heavy menstrual bleeding. Licorice is sweet and bitter in taste (Madhura, Tikta Rasa), cold in potency (Sheeta Virya), with a VP- K+ dosha effect: it pacifies Vata and Pitta while mildly aggravating Kapha.

The classical case is built on three of the herb's karmic categories from the Bhavaprakash Nighantu: Shothahara (anti-inflammatory), Pitta Shamaka (Pitta-cooling), and the demulcent action that protects and tones inflamed mucous membranes. The same properties that make Yashtimadhu the lead Ayurvedic herb for acidity, dry cough, and sore throat also fit the Pitta picture of Asrigdara, where heat has thinned the menstrual blood and inflamed the uterine lining. The Sharangadhara Samhita includes Yashtimadhu in classical fermented and decoction preparations for women's disorders, alongside Bala and other Pitta-cooling restoratives.

Licorice is most useful for the Pittaja pattern of menorrhagia, bright-red bleeding with burning, irritability, and a hot pre-flow phase, where its cold and sweet profile soothes the inflamed Rakta dhatu. It is rarely a stand-alone herb here. Its place is as the cooling demulcent in a protocol led by direct uterine astringents like Ashoka, Lodhra, and Ashokarishta. Licorice carries one important caution that matters more in cyclic use: sustained high-dose internal use raises blood pressure and can cause potassium loss, so short courses or low daily doses are the safe defaults.

How Licorice Helps with Menorrhagia

Licorice addresses menorrhagia through three classical mechanisms, all of which target the Pitta-Rakta side of the picture rather than the contractile uterine layer.

Cooling Pitta in Rakta dhatu

Classical Asrigdara is driven by Pitta accumulating in Rakta dhatu; the heat thins the blood, dilates vessels, and the flow overruns its natural taper. Licorice's Sheeta Virya (cold potency), Madhura Rasa (sweet taste), and Madhura Vipaka (sweet post-digestive effect) are the precise opposite of Pitta's qualities. The Bhavaprakash Nighantu classifies Yashtimadhu as Pitta Shamaka, the same action that gives it its lead role in acidity, ulcers, and bleeding from the upper GI tract.

Shothahara action on the inflamed lining

The endometrial inflammation that underlies many heavy cycles, dysfunctional bleeding, the post-flow soreness, the burning radiating into the pelvis, responds to the Shothahara (anti-inflammatory) action listed in the classical karma profile. Modern phytochemistry attributes this to glycyrrhizin and its flavonoids, which have documented anti-inflammatory activity on mucous membranes. The same mechanism that soothes a peptic ulcer cools an inflamed uterine lining.

Demulcent and tissue-restoring action

Licorice is classically described as a tonic to mucous membranes, the soothing, slightly unctuous layer that protects raw tissue while it heals. After a heavy bleed, the lining is depleted and sensitive; Licorice's sweet, demulcent quality helps that recovery the same way it helps a sore throat heal. Combined with its mild adaptogenic effect on the HPA axis, this makes Licorice useful between cycles in chronic heavy-flow patterns where the patient is also exhausted, stressed, and depleted.

How to Use Licorice for Menorrhagia

For menorrhagia, Licorice is used in short, low-dose courses rather than continuous high-dose intake. The dose ceiling matters because sustained intake raises blood pressure.

FormDoseBest ForWhen
Yashtimadhu powder (Churna)1 to 3 g, twice dailyDaily background, Pitta-pattern flowBefore meals, with cool water or milk
Cold infusion1 tsp powder in 250 ml cool water, steep 4 hoursAcute Pitta heat, burning bright flowTwice daily during the cycle
Licorice + Amla tea1 tsp each in 200 ml warm waterHeat-driven cycles with depletionMorning and afternoon, days 7 to 14 of cycle
Yashtimadhu Ghrita (medicated ghee)1/2 to 1 tspChronic Pitta-pattern flow with dryness or burningMorning, empty stomach, with warm milk

Anupana

  • Cool water or warm milk with a pinch of sugar, the classical Pitta-cooling vehicles
  • Honey, when the picture also involves anaemia or low energy
  • Avoid hot water and ginger as anupana, they pull the herb toward Kapha-aggravation

Course and duration

Use Licorice in 4 to 6 week courses followed by a 2 to 4 week break, especially during the cycle weeks. Most women notice reduced burning and slightly reduced volume within two cycles, but Licorice is not the herb that produces dramatic flow reduction on its own. It pairs with Ashokarishta or Ashoka bark decoction during the bleeding days for the direct astringent action it lacks.

Important caution

Sustained Licorice intake above 5 g daily for more than 6 weeks raises blood pressure and can cause potassium loss, ankle swelling, and headache. Anyone with hypertension, kidney disease, or who takes diuretics or corticosteroids should consult a practitioner before regular use, and should consider deglycyrrhizinated licorice (DGL) as a safer long-term option for the demulcent benefit without the mineralocorticoid effect.

Frequently Asked Questions

Will Licorice stop heavy menstrual bleeding?

On its own, rarely. Licorice cools the Pitta heat and inflammation that underlie the bleeding, but it does not have the direct uterine-astringent action of Ashoka or Lodhra. Use it as the cooling layer in a protocol led by those herbs or by Ashokarishta.

How long does Licorice take to work for menorrhagia?

Reduced burning and inflammatory symptoms appear within one or two cycles. Meaningful flow reduction usually needs three to four cycles and the herb is rarely the sole cause of the change. Run it in 4 to 6 week courses with breaks; sustained high-dose intake raises blood pressure.

Can I take Licorice if I have high blood pressure?

Be careful. Glycyrrhizin causes sodium retention and potassium loss, which raises blood pressure. If you have hypertension, kidney disease, or take diuretics, ACE inhibitors, or corticosteroids, use deglycyrrhizinated licorice (DGL) or work with a practitioner who can monitor your readings.

Licorice vs Shatavari for menorrhagia?

Different mechanisms, complementary. Shatavari is the rebuilder of the female reproductive tissue and the long-term restorative after blood loss. Licorice is the acute Pitta-cooler and mucosal anti-inflammatory. Many practitioners combine them: Licorice during the acute Pitta-flare phase, Shatavari as the daily background restorative.

Safety & Precautions

Licorice is one of the most-used herbs on earth, but it is also one of the very few Ayurvedic herbs with a well-documented, dose-dependent side-effect profile. The active compound glycyrrhizin is the reason for both its power and its cautions. The good news: nearly all of the risk is avoidable by understanding dose and form.

The Hypertension Warning (Read This First)

Glycyrrhizin inhibits the enzyme 11-beta-hydroxysteroid dehydrogenase, which allows cortisol to act on mineralocorticoid receptors. The practical result is pseudoaldosteronism, the body behaves as if aldosterone is elevated. This means:

  • Sodium and water retention, blood pressure rises
  • Potassium loss through urine, risk of hypokalaemia
  • In extreme cases: muscle weakness, arrhythmia, and oedema

Classical Ayurveda describes this directly: Licorice "increases water around the heart" and is contraindicated in hridroga (heart disease) and swelling. Modern cardiology agrees. Do not take therapeutic doses of whole-root Licorice if you have high blood pressure, congestive heart failure, kidney disease, low potassium, or a history of stroke. For any of these, DGL is the safe alternative.

Dose Matters Enormously

The difference between "daily tonic" and "adverse event" is dose and duration:

  • Culinary/trace amounts (a piece of root in tea, a lozenge), safe for virtually everyone
  • 1-3 g/day of powder, short-term (up to 4-6 weeks), safe for most healthy adults
  • Above 3 g/day, or daily for months, real risk of BP elevation and potassium loss, even in previously healthy people
  • DGL, no glycyrrhizin, effectively no BP risk at any typical dose

Drug Interactions

Licorice can meaningfully interact with several common medications. If you are on any of the following, consult your doctor before using therapeutic doses:

  • Diuretics (especially thiazides and loop diuretics), compounds potassium loss dangerously
  • Digoxin, low potassium increases digoxin toxicity risk
  • Corticosteroids, Licorice extends their half-life and effect
  • Warfarin, may alter bleeding risk
  • Blood pressure medication, Licorice directly opposes the drug's action
  • Oral contraceptives and hormone therapy, phyto-oestrogenic effect may potentiate
  • Insulin and oral hypoglycaemics, Licorice can affect blood sugar in either direction

Pregnancy and Nursing

Classical Ayurveda states plainly: do not use in pregnancy. Modern observational data aligns, high Licorice intake during pregnancy is associated with preterm labour and second-trimester bleeding risk. Small culinary amounts and DGL are likely fine, but therapeutic whole-root use should be avoided. During breastfeeding, small amounts appear safe, but avoid prolonged high-dose use.

Other Cautions

  • High Kapha individuals, Licorice's sweet, heavy, moist qualities can aggravate Kapha and worsen oedema, congestion, or sluggishness. Combine with ginger or black pepper to offset.
  • Low potassium diet, Licorice increases potassium excretion. Pair with potassium-rich foods (banana, spinach, coconut water).
  • Calcium absorption, chronic high-dose use may interfere with calcium absorption; classical texts flag caution in osteoporosis.
  • Hypoglycaemia, Licorice can lower blood sugar; take with food if prone.

Signs You Are Taking Too Much

Watery weight gain, puffy face, ankle swelling, muscle weakness or cramps, headaches, and unexplained BP elevation. If any of these appear, stop immediately, effects usually resolve within 1-2 weeks once the herb is discontinued.

Other Herbs for Menorrhagia

See all herbs for menorrhagia on the Menorrhagia page.

▶ Classical Text References (5 sources)

Meat juice (Mamsarasa) which is not very thick, Rasala (curds churned and mixed with pepper powder and sugar), Raga (syrup which is sweet, sour and salty) and Khandava (syrup which has all the tastes, prepared with many substances), Panaka panchasara, (syrup prepared with raisins (draksha), madhuka, dates (karjura), kasmarya, and parushaka fruits all in equal quantities, cooled and added with powder of cinnamon leaves, cinnamon and cardamom etc) and kept inside a fresh mud pot, along with leav

— Astanga Hridaya, Chapter 3: Ritucharya adhyaya Seasonal

117-118 मोचखजूरपनसना रकेलप षकम ् आ ाततालका मयराजादनमधूकजम ् सौवीरबदरा कोलफ गु ले मातको वम ् वातामा भशुका ोडमक ु ू लक नकोचकम ् उ माणं यालं च बं ृहणं गु शीतलम ् दाह त यहरं र त प त सादनम ् वाद ुपाकरसं ि न धं व टि भ कफशु कृत ् Mocha (plantain), kharjura (dates) panasa (jack fruits) narikela (cocoanut ) parusaka amrataka , tala, kasmarya, rajadana, madhuka, badara, ankola, phalgu, slesmataka, vatama, abhisuka, aksoda, mukulaka, nikocaka, urumanam, and priyala make the body stout, not easily di

— Astanga Hridaya, Chapter 6: Annaswaroopa Food

Similarly so, are Madhuka – Licorice – Glycyrrhiza glabra) and Mrdvika (grapes) Madhuka and dry grapes – both have similar qualities.

— Astanga Hridaya, Chapter 9: Dravyadi Vigyaniya

Similarly so, are Madhuka – Licorice – Glycyrrhiza glabra) and Mrdvika (grapes) Madhuka and dry grapes – both have similar qualities.

— Astanga Hridaya, Chapter 9: Dravyadi Vigyaniya

But dry grape has mild purgative action, but Madhuka does not.

— Astanga Hridaya, Chapter 9: Dravyadi Vigyaniya

, Rishabhaka, Madhuka – Licorice – Glycyrrhiza glabra, Madhuka – Madhuka longifolia, Bimbi – Coccinia grandis / indica, Vidari – Pueraria tuberosa, the two Sravani – Mundi and Sravani, Ksheerasukla, Tugaksiri, the two Ksheerini, Gambhari, the two Saha, milk, sugarcane, Gokshura, Ksaudra, Draksa etc.

— Astanga Hridaya, Chapter 10: Rasabhediyam Tastes, Their

, Rishabhaka, Madhuka – Licorice – Glycyrrhiza glabra, Madhuka – Madhuka longifolia, Bimbi – Coccinia grandis / indica, Vidari – Pueraria tuberosa, the two Sravani – Mundi and Sravani, Ksheerasukla, Tugaksiri, the two Ksheerini, Gambhari, the two Saha, milk, sugarcane, Gokshura, Ksaudra, Draksa etc.

— Astanga Hridaya, Chapter 10: Rasabhediyam Tastes, Their

It usually contains Madanaphala (Randia spinosa), Licorice etc.

— Astanga Hridaya, Chapter 18: Vamana Virechana Vidhi

Similar is the case of Anuvasana – fat enema and Matra basti – fat enema with very little oil 34-36 Anu taila जीव तीजलदे वदा जलद व से यगोपी हमं दाव व मधुक लवागु वर पु ा व ब वो पलम ् धाव यौ सरु भं ि थरे कृ महरं प ं ु ट रे णक ु ां कि ज कं कमला वलां शतगुणे द ये अ भ स वाथयेत ् ३७ तैला सं दशगण ु ं प रशो य तेन तैलं पचेत ् स ललेन दशैव वारान ् पाके पे चदशमे सममाजद ु धं न यं महागुणमुश यणुतैलमेतत ् ३८ Jivanti, Jala, Devadaru, Jalada, Twak, Sevya, Gopi (sariva), Hima, Darvi twak, Madhuka, Plava, A

— Astanga Hridaya, Chapter 20: Nasya Vidhi Nasal

13-15 For Shamana- Madyama, medium kind of smoke शमने श लक ला ा प ृ वीका कमलो पलम ् य ोधोद ु बरा व थ ल रो वचः सताः यि टमधु सुवण वक् प कं र तयि टका ग धा चाकु ठतगराः useful drugs are - shallaki, Laksha,Prithvika, Kamala, Utpala, Barks of Nyagrodha, Udumbara, Asvattha, Plaksa and Rodhra; Sita, Yasthimadhu (licorice), Suvarnatwak, Padmaka, Raktayastika Kustha, tagara and other scents – perfumeries.

— Astanga Hridaya, Chapter 21: Dhumpana Medicated Smoking

Herbal smoking blends – Dhuma dravyani – For Mridu- mild kind of smoke, म ृदौ त या यगु गु गुलु मु त थौणेयशैलेयनलदोशीरवालकम ् वय गकौ तीमधुक ब वम जैलवालुकम ् ीवे टकं सजरसो यामकं मदनं लवम ् श लक कुं कुमं माषा यवाः कु द ु काि तलाः नेहः फलानां साराणां मेदो म जा वसा घ ृतम ् useful drugs are-Aguru, Guggulu, Musta, sthauneya, Shaileya, Nalada, Usheera, Valaka, Varanga, Kounti, Madhuka, Bilvamajja, elavaluka, Shrivestaka, Sarjarasa, Dhyamaka, Madana, Plava, Shallaki, Kumkuma, Masha, Yava, Kunduruk

— Astanga Hridaya, Chapter 21: Dhumpana Medicated Smoking

For Greeshma (summer) – कुमुदो पलक हारद ुवामधुकच दनम ् Kumuda, Utpala, Kalhara, Durva, Madhuka and Chandana (Sandalwood).

— Astanga Hridaya, Chapter 22: Gandushadi Vidhi Gargles

the ulcer should be covered with cotton swab soaked in a mixture of honey, melted ghee, Anjana – Srotonjana, ash of Ksyauma (flax), Phalini, fruit of Shallaki, Rodhra and Madhuka; then bandaging and other measures done as described previously.

— Astanga Hridaya, Chapter 29: Shastrakarma Vidhi

If the site of the burn does not get torn from an ulcer because of being deep rooted, then a paste of seed of Dhanyamala-(sour gruel), Yashti (licorice) and tila (sesame) should be applied; तलक क: समधुको घ ृता ता णरोपण: । Paste of tila (sesame), and Madhuka mixed with ghee heals the ulcer.

— Astanga Hridaya, Chapter 30: Kshar-AgniKarma Vidhi

If the site of the burn does not get torn from an ulcer because of being deep rooted, then a paste of seed of Dhanyamala-(sour gruel), Yashti (licorice) and tila (sesame) should be applied; तलक क: समधुको घ ृता ता णरोपण: । Paste of tila (sesame), and Madhuka mixed with ghee heals the ulcer.

— Astanga Hridaya, Chapter 30: Kshar-AgniKarma Vidhi

Source: Astanga Hridaya, Ch. 3, Ch. 6, Ch. 9, Ch. 9, Ch. 9, Ch. 10, Ch. 10, Ch. 18, Ch. 20, Ch. 21, Ch. 21, Ch. 22, Ch. 29, Ch. 30, Ch. 30

Similarly so, are Madhuka – Licorice – Glycyrrhiza glabra) and Mrdvika (grapes) Madhuka and dry grapes – both have similar qualities.

— Astanga Hridaya Sutrasthan, Dravyadi Vigyaniya

, Rishabhaka, Madhuka – Licorice – Glycyrrhiza glabra, Madhuka – Madhuka longifolia, Bimbi – Coccinia grandis / indica, Vidari – Pueraria tuberosa, the two Sravani – Mundi and Sravani, Ksheerasukla, Tugaksiri, the two Ksheerini, Gambhari, the two Saha, milk, sugarcane, Gokshura, Ksaudra, Draksa etc.

— Astanga Hridaya Sutrasthan, Rasabhediyam Tastes, Their

It usually contains Madanaphala (Randia spinosa), Licorice etc.

— Astanga Hridaya Sutrasthan, Vamana Virechana Vidhi

Sita, Yasthimadhu (licorice), Suvarnatwak, Padmaka, Raktayastika Kustha, tagara and other scents – perfumeries.

— Astanga Hridaya Sutrasthan, Dhumpana Medicated Smoking

If the site of the burn does not get torn from an ulcer because of being deep rooted, then a paste of seed of Dhanyamala-(sour gruel), Yashti (licorice) and tila (sesame) should be applied;

— Astanga Hridaya Sutrasthan, Kshar-AgniKarma Vidhi

Source: Astanga Hridaya Sutrasthan, Dravyadi Vigyaniya; Rasabhediyam Tastes, Their; Vamana Virechana Vidhi; Dhumpana Medicated Smoking; Kshar-AgniKarma Vidhi

[249] Sauviranjana, tuttha, tapya-dhatu (maksika), manahshila, chaksushya (variety of kulattha), madhuka (Licorice – Glycyrrhiza glabra), loha bhasma(iron), precious stones, pushpanjana, saindhava, tusk of boar, kataka – strychnos potatorum may be used in the form of either powder or varti as collyrium which is excellent remedies for timira (cataract) and such other eye-diseases.

— Charaka Samhita, Chikitsa Sthana — Therapeutic Principles, Chapter 26: Three Vital Organs Treatment (Trimarmiya Chikitsa / त्रिमर्मीयचिकित्सा)

[278 ½- 279½] Recipe for restoration of hair: Application of the paste of tila – sesame (Sesamum indicum), amalaki – Phyllanthus emblica, kinjalka, madhuka– Licorice – Glycyrrhiza glabra and honey over the head restores the color of hair, and promotes hair growth.

— Charaka Samhita, Chikitsa Sthana — Therapeutic Principles, Chapter 26: Three Vital Organs Treatment (Trimarmiya Chikitsa / त्रिमर्मीयचिकित्सा)

Source: Charaka Samhita, Chikitsa Sthana — Therapeutic Principles, Chapter 26: Three Vital Organs Treatment (Trimarmiya Chikitsa / त्रिमर्मीयचिकित्सा)

Also: Murva (Marsdenia tenacissima), Madhurasa/Yashtimadhu (Glycyrrhiza glabra — licorice), Danti (Baliospermum montanum), Pushkara Moola (Inula racemosa), Bala (Sida cordifolia), Atibala (Abutilon indicum), Kapikacchu (Mucuna pruriens), and Trikantaka/Gokshura (Tribulus terrestris).

— Sharangadhara Samhita, Madhyama Khanda, Chapter 10: Asavarishta-Sandhanakalpana (Fermented Preparations)

The famous Dashanga Lepa (ten-ingredient paste) is made from: Shirisha (Albizia lebbeck), Madhuyashti (Glycyrrhiza glabra, licorice), Tagara (Valeriana wallichii), Rakta Chandana (red sandalwood, Pterocarpus santalinus), Ela (Elettaria cardamomum, cardamom), Mansi (Nardostachys jatamansi, spikenard), Nisha Yugma (Curcuma longa and Berberis aristata), Kushtha (Saussurea lappa), and Balaka (Pavonia odorata).

— Sharangadhara Samhita, Uttara Khanda, Chapter 11: Lepa Vidhi (Topical Paste Application)

By applying a paste of Yashti (licorice, Glycyrrhiza glabra), Indivara (blue lotus, Nymphaea stellata), Mridvika (raisins, Vitis vinifera), sesame oil, and ghee, Indralupta (alopecia areata) is cured and the hair becomes dense and strong.

— Sharangadhara Samhita, Uttara Khanda, Chapter 11: Lepa Vidhi (Topical Paste Application)

This nourishing paste combines the anti-inflammatory licorice with cooling blue lotus and nutritive raisins in an oil-ghee base.

— Sharangadhara Samhita, Uttara Khanda, Chapter 11: Lepa Vidhi (Topical Paste Application)

A paste of Rasna (Pluchea lanceolata), Nilotpala (blue lotus, Nymphaea stellata), Daru (Cedrus deodara), Chandana (sandalwood, Santalum album), Madhuka (licorice, Glycyrrhiza glabra), and Bala (Sida cordifolia), mixed with ghee and decoction -- this destroys Vata-type Visarpa (erysipelas/herpes).

— Sharangadhara Samhita, Uttara Khanda, Chapter 11: Lepa Vidhi (Topical Paste Application)

Source: Sharangadhara Samhita, Madhyama Khanda, Chapter 10: Asavarishta-Sandhanakalpana (Fermented Preparations); Uttara Khanda, Chapter 11: Lepa Vidhi (Topical Paste Application)

The intense pain caused by the fall of the surgical instrument on the body is pacified by irrigation with warm ghee mixed with Yashtimadhu (Glycyrrhiza glabra / licorice) (42).

— Sushruta Samhita, Sutra Sthana, Chapter 5: Agropaharaniya Adhyaya - Surgical Instruments and Procedures

Key principles: (1) Only close clean wounds, (2) Post-op lifestyle restrictions, (3) Seasonal adjustment of wound care frequency, (4) Emergency exceptions to protocol, (5) Warm ghee with licorice for post-surgical pain — licorice has proven anti-inflammatory properties.

— Sushruta Samhita, Sutra Sthana, Chapter 5: Agropaharaniya Adhyaya - Surgical Instruments and Procedures

Milk boiled with saindhava (rock salt), udicya, yashtimadhu (licorice), and pippali (long pepper), reduced to half — is beneficial for irrigation (seka) and also for ashchyotana (eye drops).

— Sushruta Samhita, Uttara Tantra, Chapter 9: Vatabhishyanda Pratishedha Adhyaya (Chapter on Treatment of Vata-type Conjunctivitis)

Madhuka (licorice), rajani (turmeric), pathya (haritaki), and devadaru (cedar) should be ground.

— Sushruta Samhita, Uttara Tantra, Chapter 9: Vatabhishyanda Pratishedha Adhyaya (Chapter on Treatment of Vata-type Conjunctivitis)

Draksha (grapes), audra, chandana (sandalwood), yashtimadhu (licorice), yoshit-tira, and rajyanka — ground to a paste with ghee, these are recommended for tarpana (eye nourishment), seka (irrigation), and nasya (nasal therapy).

— Sushruta Samhita, Uttara Tantra, Chapter 10: Pittabhishyanda Pratishedha Adhyaya (Chapter on Treatment of Pitta-type Conjunctivitis)

Source: Sushruta Samhita, Sutra Sthana, Chapter 5: Agropaharaniya Adhyaya - Surgical Instruments and Procedures; Uttara Tantra, Chapter 9: Vatabhishyanda Pratishedha Adhyaya (Chapter on Treatment of Vata-type Conjunctivitis); Uttara Tantra, Chapter 10: Pittabhishyanda Pratishedha Adhyaya (Chapter on Treatment of Pitta-type Conjunctivitis)

Medical Disclaimer: The information on this page is for educational purposes only and is not intended as medical advice. Ayurvedic treatments should be pursued under the guidance of a qualified practitioner (BAMS/MD Ayurveda). Always consult your healthcare provider before starting any new treatment. Content is sourced from classical Ayurvedic texts and may not reflect the latest medical research.