Ayurvedic Properties
- Taste (Rasa)
- Astringent (Kashaya), Bitter (Tikta)
- Quality (Guna)
- Light (Laghu), Dry (Ruksha)
- Potency (Virya)
- Cold (Sheeta)
- Post-digestive (Vipaka)
- Pungent (Katu)
- Key Constituents
- Tannins, Fixed oil from seeds, Lac
- Also Known As
- English: Ceylon Oak, Lac Tree
Sanskrit: कोशाम्र, द्रावक, क्षुद्राम्र
Hindi: कोसम
What is Ceylon Oak?
If you have ever come across kusum oil in an Indian hair-care aisle, you have already met this tree. Ceylon Oak, also called the Lac Tree, is known in Sanskrit as Koshala (Koshala). It earns its second English name because it is a host tree for lac insects, the source of lac resin.
Botanically it is Schleichera trijuga Willd., a large deciduous tree of the forests of Central and Southern India. The trunk can grow 4 to 12 feet in diameter, and its leaves are used as fodder.
In Ayurveda, two parts matter most. The seed oil, kusum oil, is used for skin diseases and as a hair oil. The astringent bark is made into a decoction for itching, eczema and other skin complaints. The Bhavaprakash Nighantu records the plant in its fifth chapter (Varga 5).
Benefits of Ceylon Oak
Ceylon Oak has a short, focused profile. The Bhavaprakash Nighantu credits it with two therapeutic actions (karma): clearing skin disease and clearing intestinal worms. Everything below comes back to those two actions and the tree's classical properties.
Skin Health
Ceylon Oak is classed as anti-dermatosis (Kusthaghna, literally "destroyer of skin disease"). In Ayurveda, Kushtha is the broad term for chronic skin disorders.
The bark decoction is the classical internal and wash preparation for itching, eczema and skin disorders. The bark is astringent, and the tree as a whole is astringent (Kashaya) and bitter (Tikta) in taste, with a cooling potency (Sheeta Virya, the cool energy a herb exerts in the body). That bitter, astringent, cooling combination is the classical signature of herbs used for skin.
Scalp and Hair
The seed oil, kusum oil, is used as a hair oil. It is the part of the tree most people encounter today, applied externally rather than taken as medicine.
Dry Skin
Because the seed oil is used externally on the skin, our knowledge graph also links Ceylon Oak to dry skin. Here the oil does the work. The bark, which is light (Laghu) and dry (Ruksha) in quality, is not the part to reach for when skin is already dry.
Intestinal Worms
Ceylon Oak is also listed as anthelmintic (Krimighna, "destroyer of worms"). This connects it to parasites and worms (Krimi). The classical text names the action but gives no specific preparation for it, so treat this as a practitioner-guided use rather than a home remedy.
How to Use Ceylon Oak
Ceylon Oak is used in two ways: the seed oil on the outside of the body, and a decoction (kashaya, a herb simmered in water and reduced) of the bark. The classical dose notes are brief, so keep your use simple.
| Form | Dose | Best For | When to Take |
|---|---|---|---|
| Seed oil (kusum oil) | Applied externally | Skin complaints, hair oil, dry skin | Applied to skin or scalp as needed |
| Bark decoction | 1 to 2 tola (a classical unit of weight), per the classical record | Itching, eczema, skin diseases | Under the guidance of a qualified practitioner |
The tola is an old Indian weight unit, and classical doses are not always simple to translate into modern kitchen measures. For the bark decoction, follow a qualified Ayurvedic practitioner or the product label rather than estimating on your own.
The source facts do not give a preferred vehicle (anupana, the liquid or food a herb is taken with) or seasonal guidance for Ceylon Oak, so none is suggested here.
Safety & Side Effects
Our sources hold very little safety data for Ceylon Oak. No specific contraindications, drug interactions or overdose signs are recorded, and that absence is not proof of safety.
- External oil: kusum oil is described as edible and is used on skin and hair. As with any new oil, test a small patch of skin first and stop if irritation appears.
- Bark decoction: this is the internal, medicinal form. Use it only with guidance from a qualified Ayurvedic practitioner, who can set the dose.
- Pregnancy, nursing and medication: no data is available. Avoid internal use unless a qualified practitioner or your doctor approves it.
Recommended: Start Here
The simplest way to start with Ceylon Oak today is its seed oil. Kusum oil is the form the classical record describes for skin diseases and as a hair oil, and it is used externally, so you can try it without guessing at internal doses.
Massage a small amount into the scalp as a hair oil, or apply it to areas of rough, troubled skin. Do a patch test on your inner arm first.
Save the bark decoction for later, and only with a practitioner. It is the classical internal remedy for itching and eczema, but the dose is given in an old unit of weight and is best set by someone trained.
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Safety note: little safety data exists for Ceylon Oak, so stop any product that irritates your skin and avoid internal use in pregnancy without professional advice.
Ceylon Oak vs Other Herbs & Supplements
Ceylon Oak sits among a group of bitter, astringent trees that Ayurveda uses for the skin. Here is how it compares with the better-known options.
| Comparison | Ceylon Oak | Alternative | Verdict |
|---|---|---|---|
| Ceylon Oak vs Neem | Bitter, astringent, cooling. Bark decoction for itching and eczema; seed oil for skin and hair. | Same taste, quality and potency profile. Described as Ayurveda's foremost skin herb, with leaf juice for eczema and acne and oil for ringworm. | Neem is the first choice for most skin complaints and has far more classical depth. Ceylon Oak is a narrower option, mainly valued for its oil. |
| Ceylon Oak vs Khadira | Anti-dermatosis and anthelmintic. Dose notes are sparse. | Also bitter, astringent and cooling, with the same two actions on skin and worms, plus use for bleeding gums. Clear doses on record. | For stubborn skin disease taken internally, Khadira is better documented. Ceylon Oak is the choice when you want an external oil. |
| Ceylon Oak vs Coconut (for dry skin) | Kusum oil applied externally. The bark itself is light and dry. | Sweet, heavy, unctuous and cooling. Mature coconut oil is used to seal scalp and skin. | For simple dryness, coconut oil has the moister, heavier qualities. Kusum oil is an alternative hair and skin oil. |
| Ceylon Oak vs Vidanga (for worms) | Anthelmintic action named, no preparation given. | A prime anthelmintic herb, especially against tapeworms, with a recorded dose taken with honey or buttermilk. Pungent and hot. | For intestinal worms, Vidanga is the established classical herb. Ceylon Oak is a secondary option for a practitioner to consider. |
Ceylon Oak for Specific Populations
Our sources hold no population-specific guidance for Ceylon Oak. The notes below lean toward caution for that reason.
Pregnancy & Nursing
No safety data is available. Avoid the internal bark decoction unless a qualified practitioner or your doctor approves it. If you want to use kusum oil on your skin or hair, check with your doctor first.
Children
No pediatric dose is recorded. Do not give the bark decoction to children without a qualified practitioner's guidance.
Elderly
No specific guidance is recorded. External use of the oil is the gentler starting point. Anyone on regular medication should ask their doctor before taking the decoction.
Athletes
Ceylon Oak has no recorded role in performance or recovery. Its uses are focused on skin, hair and intestinal worms.
Frequently Asked Questions
What is kusum oil?
Kusum oil is the oil pressed from the seeds of Ceylon Oak (Schleichera trijuga). The classical record describes it as edible and used medicinally, especially for skin diseases and as a hair oil.
Why is Ceylon Oak called the Lac Tree?
The tree is a host for lac insects, which produce lac resin. That role is why Lac Tree is one of its English names, alongside Ceylon Oak.
Which parts of Ceylon Oak are used?
The seed oil is used on skin and hair, and the bark is made into a decoction for itching, eczema and skin diseases. The leaves are used as animal fodder rather than as medicine.
Can Ceylon Oak help with intestinal worms?
The Bhavaprakash Nighantu lists it as anthelmintic (Krimighna), which links it to worm infestations. No specific preparation for this use is recorded, so work with a qualified practitioner rather than treating worms at home.
What is the Sanskrit name for Ceylon Oak?
Its main Sanskrit name is Koshala (Koshala), and other Sanskrit synonyms include Koshamra, Dravaka and Kshudramra. In Hindi it is called Kosam.
How to Use Ceylon Oak by Condition
Explore how Ceylon Oak is used for specific health concerns — with dosage, preparation methods, and classical references for each.
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.