Indigo: Benefits, Uses & Dosage

If you have ever wondered how people darkened grey hair long before boxed dyes existed, the answer often starts with a leaf that turns your fingers dark blue-green when you rub it. That leaf belongs to Indigo (Neeli), a plant best known as a source of dye but valued in Ayurveda as a medicine in its own right.

Its botanical name is Indigofera tinctoria Linn., and it is also called True Indigo, or Neel in Hindi. The Bhavaprakash Nighantu, a classical Ayurvedic materia medica, describes it as bitter, light, dry and hot in potency, and names it among herbs that are good for the hair (Keshya).

Beyond hair care, the classical texts credit Indigo with countering poisons, clearing worms and helping with skin disease. It calms Kapha and Vata, two of the three body energies (doshas) Ayurveda uses to describe your constitution.

Hair Health

Hair is Indigo's signature use. The Bhavaprakash Nighantu lists it as Keshya, meaning beneficial for hair, and its leaves have long been used for hair coloring and hair-related complaints.

The Sharangadhara Samhita describes a hair-blackening paste (Krishnikara lepa) made from equal parts Triphala, Indigo leaves, iron filings and Bhringaraja.

Triphala, Nilika leaves, iron filings and Bhringaraja in equal parts, ground with sheep's urine, is renowned as a hair-blackening preparation.

Sharangadhara Samhita, Uttara Khanda, Chapter 11

Skin Conditions

Indigo is classed as Kushthaghna, a herb that treats skin disorders (Kushtha). Its bitter, astringent taste and dry quality are traditionally used to dry up the excess Kapha behind many skin complaints.

Worms and Parasites

As a Krimighna (anthelmintic) herb, Indigo is used against worm infestations (Krimi). The Sushruta Samhita, Uttara Tantra 26, mentions indigo in an anti-worm nasal preparation (nasya).

Poisoning

The classical texts call Indigo Vishaghna, an antidote to poison, and note its use in treating poisoning.

Inflammation and Wounds

Indigo is also described as having anti-inflammatory and wound-healing properties, which links it to inflammation (Shotha). The Sahasra Yoga drug index adds that it is used internally as a liver-protective herb.

Our sources describe how Indigo is prepared but do not give fixed doses, so take any internal use under the guidance of a qualified Ayurvedic practitioner.

In the Sharangadhara Samhita, Indigo (Nilini) appears in a powder formula alongside rock salt (Saindhava) and black salt (Krishna Lavana).

For hair, the leaf paste is the simplest route: it darkens and strengthens the roots.

Our sources do not list specific contraindications or drug interactions for Indigo, so this section stays short.

What the classical properties do tell you: Indigo is hot in potency and dry in quality. In Ayurvedic terms, hot and dry herbs are used cautiously by people with a strong Pitta tendency, which shows up as heat, acidity or inflammation.

External use as a hair paste is the most familiar way people meet this plant. Internal use for worms, skin disease or liver support should be supervised by a qualified practitioner, since our sources give no standard internal dose.

If you are pregnant, nursing or taking prescription medication, speak to your doctor before using it internally.

Pregnancy & Nursing

Our sources contain no safety data on Indigo during pregnancy or breastfeeding. Avoid internal use unless your doctor approves it.

Children

Indigo is used against worms in classical texts, but no child doses appear in our sources. Do not give it to children internally without a practitioner's guidance.

Elderly

Older adults are the most common users of Indigo as a hair pack for greying hair. External use is the gentle option; internal use should be supervised.

Athletes

Our sources describe no specific use of Indigo for athletic performance.