Alum: Benefits, Uses & Dosage

If you grew up in an Indian household, you may already know alum as the clear crystal block kept by the bathroom sink and rubbed on a nick after shaving. Ayurveda takes that same household staple seriously as medicine. It is one of the few remedies on this site that is not a plant at all.

Alum, known in Sanskrit as (Sphatika) and in Hindi as Fitkari, is a translucent crystalline mineral. Chemically it is potash alum, a hydrated potassium aluminium sulphate. Classical texts also list another Sanskrit name for it, (Saubhagya).

The Bhavaprakash Nighantu describes alum as a remedy used both externally and internally. Outside the body it stops bleeding, cleans wounds, washes the eyes and serves as an antiseptic gargle. Taken internally, only in its purified form, it has been used for cough, diarrhea and leucorrhea (a whitish vaginal discharge).

Alum also has a place in the more technical side of Ayurvedic pharmacy. Burnt alum appears in many classical preparations, and alum ash (Sphatika Bhasma), a calcined powder made through a set purification process, is used for respiratory complaints.

Alum's uses all flow from one dominant quality: it is strongly astringent. In Ayurveda its taste is astringent (Kashaya) and sour (Amla), it is light (Laghu), and it has a cooling potency (Sheeta Virya). Its post-digestive effect (Vipaka), the way it acts after digestion, is pungent (Katu).

That astringency tightens, binds and dries. The Bhavaprakash Nighantu lists its main actions (Karma) as hemostatic, binding, wound healing, purifying and anti-parasitic.

Stopping Bleeding

Alum's best-known action is stopping bleeding (Raktastambhana). The Bhavaprakash Nighantu notes that it is applied on cuts to stop bleeding, which is exactly why it ends up next to the razor in so many homes.

Ayurveda links this action to bleeding disorders, a group of conditions classical texts call (Raktapitta). Its cooling potency and binding nature are the reasoning behind this use.

Wound Healing and Skin

Alum is described as wound healing (Vrana Ropana), meaning it helps a wound close and repair. It is also used externally in skin diseases and as an antiseptic.

Our sources connect alum with skin disorders (grouped in Ayurveda under Kushtha), burns and yeast infections. These are external, topical uses, and any of them deserves a practitioner's input before you try it.

Eye Care

The Bhavaprakash Nighantu mentions alum in eye washes. The Sushruta Samhita goes further, naming alum among the ingredients used in treating a blood-type form of conjunctivitis.

Sphatika (alum), vidruma (coral), conch shell, madhuka (licorice), and honey as well.

Sushruta Samhita, Uttara Tantra, Chapter 12

This is a classical, practitioner-prepared use. Never put alum in your eyes on your own.

Mouth and Throat

Alum has a long history as an antiseptic gargle. Its astringent, cleansing action is the reasoning behind this use.

Parasites and Worms

The Bhavaprakash Nighantu lists alum as anti-parasitic (Krimighna). Ayurveda therefore connects it with parasites and worms (Krimi).

Internal and Respiratory Uses

Purified alum is used internally for cough, diarrhea and leucorrhea, and alum ash is used in respiratory disorders. The binding action that stops bleeding is the same one that checks loose stools and discharge.

These internal uses always rely on purified or calcined alum made by a pharmacy, never on raw crystal from the shop.

Purifying Water

The Bhavaprakash Nighantu also records alum as a purifying agent (Shodhana) used to clear water. It is a household use more than a medical one.

Alum is used very differently from most herbs on this site. For a newcomer, the simplest rule is this: external use is the household tradition, and internal use belongs to a practitioner.

Our sources give no specific dose for any form of alum. Set any internal dose with a qualified Ayurvedic practitioner, who will also choose the right purified product.

Why purification matters

The Sharangadhara Samhita, in its chapter on the purification (Shodhana) and calcination (Marana) of metals and minerals, includes alum alongside minerals such as borax and copper sulphate. These are pharmacy processes that turn a raw mineral into something considered fit for internal use.

That is why the internal rows above say purified alum or alum ash. Plain crystal sold for shaving or water treatment is not the same thing.

Eye washes

Classical texts use alum in eye preparations, but these are made and dosed by practitioners. Do not make an alum eye wash at home.

Used on the skin in the traditional way, alum is a familiar household remedy. Internal use is a different matter, and our sources are thin on safety data, so caution is the honest position.

What our sources tell us

• Internal use in the classical texts is of purified alum or alum ash (Sphatika Bhasma), not raw crystal.
• The Sharangadhara Samhita places alum among the minerals that go through formal purification and calcination before use.
• Eye use appears in classical treatment of conjunctivitis, prepared by a physician.

What our sources do not cover

Our sources list no specific contraindications, drug interactions or overdose signs for alum. That gap is not a sign that alum is risk free. It means you should not take it internally without a qualified practitioner.

Practical cautions

• Do not swallow raw alum or alum gargle water.
• Do not put alum in your eyes unless a practitioner has prepared the remedy.
• For deep wounds, burns or bleeding that will not stop, seek medical care rather than relying on alum.
• Avoid internal use in pregnancy, while nursing and in children unless a practitioner directs it.

Alum is a mineral, so the fairest comparisons are with the other substances classical texts name alongside it. Each row draws only on what our sources say about both sides.

Comparison	Alum	Alternative	Verdict
Alum vs Borax	Astringent and sour, cooling potency; stops bleeding, heals wounds, binds	Borax (Tankana): pungent, sharp, heating potency; used for cough and respiratory disorders as a mucus-dissolving agent	Both are minerals purified in the same Sharangadhara Samhita chapter. Alum is the cooling binder; borax is the heating mucus clearer. A practitioner chooses between them.
Alum vs Licorice	Mineral; astringent, used externally and, when purified, internally	Licorice (Yashtimadhu): sweet plant root, cooling, soothing to mucous membranes and the throat	The Sushruta Samhita uses them together in eye treatment. Alum tightens and dries; licorice soothes. For an everyday sore throat remedy, licorice is the gentler plant option.
Alum vs Conch Shell	Astringent and sour; Bhasma used for respiratory disorders	Conch shell (Shankha): sweet and astringent, cooling; its Bhasma is an antacid for hyperacidity and indigestion	Both are cooling and appear together in the Sushruta Samhita. Choose alum for bleeding and wounds; conch shell ash is the digestive and acidity remedy.

Our sources give no population-specific safety data or dose adjustments for alum. The guidance below is cautious for that reason.

Pregnancy & Nursing

There is no safety data in our sources for alum in pregnancy or while nursing. Avoid any internal use unless a qualified practitioner directs it.

Children

Our sources do not cover alum use in children. Keep alum blocks out of reach, and do not give alum internally to a child without practitioner guidance.

Elderly

Our sources give no specific guidance for older adults. Brief external use on minor cuts follows the household tradition; anything internal should be set by a practitioner who knows your health and medicines.

Athletes

Our sources do not describe any particular use of alum for athletes. Its classical role in stopping bleeding from minor cuts applies to anyone, but alum is not a performance or recovery supplement.