Calcarea carbonica
Made from oyster-shell calcium carbonate — common chalk; the great constitutional remedy of slow, solid, chilly constitutions.
The whole picture, in one breath
Think of the fair, plump, easily-tired person — flabby muscles, cold damp feet, sour-smelling sweat on the head of a child at night, fears of the dark, madness and misfortune, and a stubborn craving for eggs and chalky, indigestible things. Slow to develop, slow to recover, chilly with a milky-white look. Leucophlegmatic, sweaty, fearful: that is Calcarea carbonica.
The substance, in plain words
Oyster shells are nearly pure calcium carbonate — the same chalk of blackboard and antacid tablet. Hahnemann made it a constitutional remedy for 'slow' constitutions; the parallel with calcium's real roles in bone, nerve and blood clotting is chemically apt, however the dilution question stands.
The traditional picture Classical sources
The inner state
- Anxious imagination. Fear of the dark, of going mad, of misfortune and disease; vivid apprehension at night.
- Obstinate slowness. The classical type: deliberate, methodical, stubborn — 'the oyster that will not open.'
- Despair over trifles. Melancholy, homesickness, weeping at music, peevishness in children.
The body
- The sour head-sweat. The famous sign: the sleeping child's head is bathed in sour sweat, wetting the pillow.
- Soft, flabby build. Pallor, cold damp extremities, loose muscles, slow dentition and slow walking in children.
- Cravings. Eggs (especially boiled), chalk, lime, slate pencils, indigestible things.
- Glands and bones. Enlarged tonsils and glands; slow-healing bones; the classical scrofulous, rachitic constitution.
- Circulation. Palpitations from emotion and exertion; coldness with sweating.
- Digestion. Sour everything — sour eructations, sour stool, sour sweat; worse for milk.
Modalities (worse and better factors)
| Worse from ⬇ | Better from ⬇ |
|---|---|
| cold damp weather; exertion; mental effort; milk; standing. | dry weather; warmth; lying with the head raised; constipation relieved by stool. |
Where it acts (organ affinities)
Bones and growth, glands and lymphatics, skin (chapped, unhealthy), circulation, nutrition.
Where the classical picture comes from
The proving with oyster-shell lime produced chilliness, sour sweat, glandular swellings and bone pains — matched to the pale, sweaty, slow children of the classical era, in whom calcium-deficiency rickets was then rampant. Its portrait walks hand in hand with the history of nutritional bone disease.
The substance in real medicine Pharmacology
What this section is: the pharmacology and toxicology of the source substance. It is not clinical evidence that a homeopathic preparation of it treats any condition. What controlled trials do and do not show is set out on the Evidence page.
Calcium carbonate is the humble workhorse of real medicine: a safe antacid and calcium supplement, and calcium itself is essential to bone, muscle, nerve firing and clotting. Genuine calcium deficiency causes rickets, tetany and osteoporosis — conditions treated with calcium and vitamin D, not dilutions. The remedy's classical picture is, at root, a portrait of calcium-starved childhood.
Look-alikes (how the classical authors told it apart)
| Remedy | Looks similar because… | Tells it apart because… |
|---|---|---|
| Sulphur | Hot, red, untidy constitution | Sulphur is hot, itchy and bath-hating; Calcarea is chilly, sweaty and flabby. |
| Silicea | Weak glands, slow healing | Silicea is finer-boned, cold and sweat-footed with abscesses; Calcarea is plump and milky-sweaty. |
| Baryta carbonica | Slow, dwarfish children | Baryta is the delayed, backward child; Calcarea is the sweaty, egg-craving plump one. |
| Phosphorus | Tall slender versus plump pallor | Phosphorus is lean, bleeding-prone and cold-drink loving; Calcarea is fair, fat and fearful. |