Ayurvedic Properties
- Taste (Rasa)
- Pungent (Katu)
- Quality (Guna)
- Light (Laghu), Sharp (Tikshna)
- Potency (Virya)
- Hot (Ushna)
- Post-digestive (Vipaka)
- Pungent (Katu)
- Key Constituents
- CaCO3 (Calcium oxide (CaO), calcium carbonate)
- Also Known As
- English: Lime, Calcium, Chalk
Sanskrit: शुद्धा, चूर्ण
Hindi: चूना
What is Calcium/Chalk?
Limestone, sea shells and coral do not sound like medicine, yet all three are sources of one of the strongest minerals in the classical Ayurvedic pharmacy. It is a substance you respect rather than experiment with.
Calcium, known in English as Lime or Chalk (Sudha, Chuna), is calcium oxide and calcium carbonate. The Bhavaprakash Nighantu (Varga 7) says it is obtained from limestone, shells and coral.
It is used in preparations for worm infestations and digestive disorders, and it is a component of various alkaline preparations (Kshara). Externally, raw lime is a caustic agent, which is exactly why it is only ever used inside prepared classical formulas.
Benefits of Calcium/Chalk
Calcium is pungent in taste (Katu), light and sharp in quality (Laghu, Tikshna), hot in potency (Ushna Virya) and pungent after digestion (Katu Vipaka). This is a penetrating, heating substance, and its uses follow from that.
Digestion
The Bhavaprakash Nighantu classes calcium as an appetizer (Deepana), a substance that kindles digestive fire, and it is used in preparations for digestive disorders. Its hot, sharp and pungent nature is what drives this action.
Worm Infestations
Calcium is anthelmintic (Krimighna), acting against worms, and is used in preparations for parasites and worm infestations.
Eye Remedies
The Sushruta Samhita (Uttara Tantra 10) includes coral calcium (phena) and conch (shankha) among the ingredients of an eye preparation (anjana) ground with breast milk for Pitta-type conjunctivitis. This is a prepared remedy made by a practitioner.
Hair and Scalp Pastes
The Sharangadhara Samhita (Uttara Khanda 11, Lepa Vidhi) describes calcium-rich ash in topical pastes as providing mineral building blocks for hair growth, and conch shell powder as a calcium source that is antifungal. See calcium for hair loss for the details.
Pain Relief in Classical Surgery
The Sharangadhara Samhita (Parishishtam) mentions a cuttlefish bone calcium preparation (Phaniphena) applied to relieve pain, and calcium-based analgesic preparations in post-operative care. These are clinical uses, not home remedies.
How to Use Calcium/Chalk
Calcium in Ayurveda is never used as raw lime. It appears as one ingredient within prepared classical formulas, made and dosed by a practitioner.
| Form | Dose | Best For | When to Take |
|---|---|---|---|
| Classical internal preparations | Only as prescribed by a qualified practitioner; our sources give no dose | Worm infestations, digestive disorders | As directed |
| Alkaline preparations (Kshara) | Prepared and dosed by a practitioner | Classical pharmacy uses | As directed |
| Eye preparation (anjana) with coral calcium and conch | Prepared and applied by a practitioner | Pitta-type conjunctivitis (Sushruta Samhita) | As directed |
| Topical hair paste (lepa) with shell or calcium-rich ash | One ingredient in a prepared paste | Hair and scalp support | As directed |
If you are simply looking for more calcium in your diet, food is the safe route. Black sesame seeds are the Ayurvedic favourite for nourishing bone tissue.
Safety & Side Effects
Calcium is one of the substances where Ayurveda is most firm about preparation. Raw lime is caustic, and caution here is not optional.
Never use raw lime
The Bhavaprakash Nighantu describes lime as a caustic agent when used externally. Do not put raw lime (chuna) on skin, scalp or eyes, and do not swallow it. Use calcium only as part of a properly processed classical preparation, under a qualified practitioner.
Who should be careful
Calcium is hot, sharp and light. These qualities can aggravate Pitta, the dosha of heat, so people who run hot should leave any use to a practitioner's judgement.
Interactions and overdose
Our sources record no specific drug interactions or overdose signs for the classical preparations. That is a gap in the record, not proof of safety, so tell your doctor about any mineral preparation you take.
Recommended: Start Here
The simplest, safest way to start with Calcium today is to get it from food, not from lime. Black sesame seeds are the food Ayurveda turns to for nourishing bone tissue, and they carry none of the risks of a caustic mineral.
Kitchen version: dry-roast 1 to 2 tablespoons of black sesame seeds, grind them, and stir them into warm milk, porridge or rice.
Medicinal use: for worms or digestive disorders, calcium is used inside prepared classical formulas. If a practitioner recommends one, it should be a properly processed preparation such as a shell-based bhasma, never raw lime.
Find Black Sesame Seeds on Amazon ↗ Shankh Bhasma (practitioner use) ↗
Safety note: raw lime is caustic, so never apply or swallow it, and take any calcium bhasma only under a qualified practitioner.
Calcium/Chalk vs Other Herbs & Supplements
Classical texts draw calcium from several sources. Here is how they compare.
| Comparison | Calcium/Chalk | Alternative | Verdict |
|---|---|---|---|
| Lime vs Conch shell (Shankha) | Calcium oxide and carbonate from limestone, shells and coral; caustic when raw | Conch shell powder supplies calcium with an antifungal alkalinity in topical pastes (Sharangadhara Samhita) | Conch is a specific calcium source within prepared formulas. Neither is for raw home use. |
| Lime vs Coral calcium (Phena) | Used for worms and digestive disorders | Coral calcium is an ingredient in a Sushruta eye preparation for Pitta-type conjunctivitis | Coral calcium appears in eye remedies; the choice is a practitioner's. |
| Lime vs Cuttlefish bone (Phaniphena) | Appetizer and anthelmintic | Applied to relieve pain in the Sharangadhara Samhita | Different classical jobs. Both are clinical, not self-care. |
| Lime vs Black sesame seeds | A strong, hot mineral used inside formulas | Sesame seeds are a food that nourishes bone tissue | For everyday calcium, choose sesame. Lime belongs to the practitioner's pharmacy. |
Calcium/Chalk for Specific Populations
Our sources give no population-specific doses for calcium preparations, so the guidance below errs on the side of caution.
Pregnancy & Nursing
Do not take lime or any calcium bhasma while pregnant or nursing unless a qualified practitioner who knows your case prescribes it. The Sharangadhara Samhita's calcium uses in this area are clinical treatments given by a physician.
Children
Keep raw lime away from children, as it is caustic. Never give a mineral preparation to a child without a practitioner. Calcium-rich foods are the safe route.
Elderly
Calcium is hot and sharp, which is not gentle on a sensitive system. Older people should use only practitioner-prescribed preparations and rely on food for daily mineral needs.
Athletes
Our sources record no athletic use for lime. Food sources such as sesame seeds are the sensible choice.
Frequently Asked Questions
What exactly is Sudha?
Sudha, also called Chuna, is lime: calcium oxide and calcium carbonate. In Ayurvedic medicine it is used only within prepared classical formulas, not as a raw substance.
Where does Ayurvedic calcium come from?
The Bhavaprakash Nighantu says it is obtained from limestone, shells and coral. Classical texts also name conch shell, coral calcium and cuttlefish bone as specific calcium sources.
Is lime safe on the skin?
No. Raw lime is described as a caustic agent when used externally. Calcium sources appear in topical pastes only as one ingredient of a prepared formula.
What is a Kshara?
A Kshara is an alkaline preparation made in classical Ayurvedic pharmacy. Calcium is a component of various Kshara preparations, which are made and used by practitioners.
Does calcium help digestion in Ayurveda?
It is classed as an appetizer (Deepana) and is used in preparations for digestive disorders. That use is within prescribed classical formulas, so see a practitioner rather than taking lime yourself.
How to Use Calcium/Chalk by Condition
Explore how Calcium/Chalk is used for specific health concerns — with dosage, preparation methods, and classical references for each.
▶ Classical Text References (2 sources)
References in Sharangadhara Samhita
The animal keratin and calcium-rich ash provides mineral building blocks for hair growth.
— Sharangadhara Samhita, Uttara Khanda, Chapter 11: Lepa Vidhi (Topical Paste Application)
Conch shell powder provides calcium and alkalinity that is antifungal.
— Sharangadhara Samhita, Uttara Khanda, Chapter 11: Lepa Vidhi (Topical Paste Application)
The physician should relieve pain using Phaniphena (cuttle-fish bone/calcium preparation) application.
— Sharangadhara Samhita, Parishishtam, Chapter 23: Vaginal Prolapse and Spasms (Yoni Achhepa)
Post-operative care: urethral catheterization if urinary retention occurs, and pain management with calcium-based analgesic preparations.
— Sharangadhara Samhita, Parishishtam, Chapter 23: Vaginal Prolapse and Spasms (Yoni Achhepa)
The physician should relieve pain using Phaniphena (cuttle-fish bone/calcium preparation) application.
— Sharangadhara Samhita, Parishishtam, Chapter 22: Vaginal Prolapse and Spasms (Yoni Achhepa)
Source: Sharangadhara Samhita, Uttara Khanda, Chapter 11: Lepa Vidhi (Topical Paste Application); Parishishtam, Chapter 23: Vaginal Prolapse and Spasms (Yoni Achhepa); Parishishtam, Chapter 22: Vaginal Prolapse and Spasms (Yoni Achhepa)
References in Sushruta Samhita
Musta (nut grass), phena (coral calcium), sea utpala (lotus), krimi (worm-wood), ela (cardamom), amalaki seeds, talisha, shaila (rock), gairika (red ochre), ushira (vetiver), and shankha (conch) — these ground with breast milk make the anjana.
— Sushruta Samhita, Uttara Tantra, Chapter 10: Pittabhishyanda Pratishedha Adhyaya (Chapter on Treatment of Pitta-type Conjunctivitis)
Source: Sushruta Samhita, 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.