What is Raktacandana?

Raktacandana is the deep red heartwood of the tree Pterocarpus santalinus, best known in English as red sandalwood or red sanders. In Ayurveda it is ground into a paste or powder and used mainly on the skin, and sometimes taken by mouth as a cooling drug for heat, thirst and rashes.

It is a single drug, not a mixture. Despite the name, it is not the same plant as white sandalwood (Santalum album), and it has almost no scent. The wood is prized for its colour, which comes from red pigments in the heartwood.

Here is the plain verdict. Raktacandana has a long and clear record in classical Indian medicine, but that record is not proof that it works. We could find no published human trials of it, so its benefits in people remain untested.

How does Raktacandana work?

Nobody has shown how Raktacandana works in the human body, and the ideas below are unproven.

In Ayurveda it is classed as a cooling, drying drug used to settle pitta, the body heat principle. That is a traditional idea, not a measured effect.

Lab work on extracts of the wood points to antioxidant activity (mopping up unstable molecules) and some anti-inflammatory action in cells and in rats. Cell and animal results often fail to repeat in people, so treat them as a starting point only.

What forms does Raktacandana come in?

Raktacandana is sold in a few simple forms:

Billets or sticks of heartwood, rubbed with water on a stone to make a paste for the skin.

Fine powder (churna) for skin pastes, or mixed into water, milk or honey for internal use.

An ingredient in ready-made Ayurvedic creams, oils and compound powders.

A water infusion or decoction of the chips.

One warning about sourcing. The tree is endangered and protected by international trade rules, so genuine wood is scarce and fakes are common. Cheaper red woods such as Adenanthera pavonina and Caesalpinia sappan are often sold in its place.

Where it comes from:

Raktacandana is named in the classical Ayurvedic texts, including the Charaka Samhita and Sushruta Samhita, where it appears in cooling formulas for bleeding, burning skin and fever. It was used in Siddha and Unani practice too, and the same wood is known in Chinese medicine as zi tan.

It has also been used for centuries as a dye for cloth and food colouring, and as a timber for carving and musical instruments.

What does Raktacandana help with?

• Acne and oily skin: This is the most common modern use. A paste of the powder and water, or rose water, is spread on the skin and washed off when dry. We found no human trials testing it for acne. The support here is traditional use plus lab hints of anti-inflammatory action, which is weak ground.
• Rashes, prickly heat and skin burning: Ayurveda treats Raktacandana as a cooling paste for hot, itchy, irritated skin, often mixed with white sandalwood or rose water. No human trial has tested this. Some of the relief people report may simply come from the cool, damp paste itself.
• Minor wounds and boils: Classical texts list it as a wound drug, and rat studies report faster wound closure with extracts of the wood. Animal results are not proof for people. Do not put it on a deep cut, a burn or any wound that is hot, swollen or leaking pus. Those need medical care.
• Excess thirst and body heat: Taken by mouth in water, it was a classical drug for thirst, burning and what texts describe as raktapitta, a bleeding disorder. There is no modern human evidence for any of this. Ongoing unexplained thirst can be a sign of diabetes, so get it checked rather than treated at home.
• Dark spots and uneven skin tone: Modern cosmetic use in India leans on tradition and on the striking colour of the wood. No trial supports a skin-lightening or spot-fading effect. Any claim of a guaranteed result is marketing, not evidence.

What are the side effects of Raktacandana?

• Skin redness, itching or a rash where the paste was applied
• Temporary reddish staining of skin, nails, cloth and towels
• Dry or tight skin after repeated use
• Upset stomach or nausea when taken by mouth
• Allergic reaction, which is uncommon but possible
• Problems from fake or mixed-in wood, which is a real risk with this species

Good to know:

Reported side effects are mostly mild and limited to the skin. Serious harm has not been reported in the medical literature, but that partly reflects how little it has been studied, so absence of reports is not the same as proof of safety.

Test a small patch of skin first and wait 24 hours before using a paste widely. Stop at once if the skin burns, blisters or swells.

How much Raktacandana should you take?

• Recommended daily: No safe or effective dose has been set by research. What follows is traditional practice, not a tested amount. On the skin: a paste of about 1 to 3 grams of powder mixed with water, left on until it dries, then rinsed off. By mouth: Ayurvedic texts and modern practitioners use roughly 1 to 3 grams of powder a day, split into two doses. Take it by mouth only under the care of a qualified practitioner. Do not raise the dose in the hope of a stronger effect.
• Best time of day: Skin pastes are usually applied once a day, often in the evening after washing. Internal doses are traditionally split between morning and evening.
• With or without food: When taken by mouth it is usually given with water, milk or honey, either before or after food. There is no evidence that timing with food matters.
• Time to effect: Not known, because no trial has measured it. Traditionally a skin paste is expected to feel cooling right away, while any change in spots or acne would take weeks. Treat quick, dramatic promises with suspicion.
• How long to take it: For skin use, a few weeks is a reasonable trial. If your skin is no better after about four weeks, stop and see a doctor or a dermatologist (a skin doctor). Long runs of the powder by mouth have not been studied for safety. Do not take it by mouth for months on end without a practitioner checking on you.