Last verified: April 2026
Neem — Nimba
Neem is one of the most extensively documented plants in the classical texts — appearing across Charaka Samhita, Sushruta Samhita, and Bhavaprakasha in the context of skin conditions, fever, wound management, and blood purification. The Sanskrit name Nimba means 'that which bestows good health' — and the breadth of its classical documentation suggests the tradition knew exactly what it had.
Neem is the most bitter plant in the Ayurvedic pharmacopoeia. That is not an accident of flavour — it is the operative classification. In the Ayurvedic system, bitter taste (Tikta Rasa) is formed from Air and Space elements and has specific effects: it reduces Pitta and Kapha, it purifies the blood, it kills micro-organisms (Krimighna), and it clears accumulated heat and toxins from the tissues and channels. Neem has all of these properties in concentrated form.
Charaka Samhita's Tikta Skandha (bitter group) is one of the most important herb groups in internal medicine — it covers the herbs prescribed for skin conditions, inflammatory conditions, fever, and blood disorders. Neem is its most potent member. Sushruta Samhita's surgical tradition documents neem separately — in wound management protocols where its antimicrobial and healing properties are applied topically. The two traditions arrive at the same plant from different directions.
The cold Virya is the key differentiator from turmeric (also used for skin conditions but with hot Virya). Neem cools where turmeric warms. This determines their different constitutional applications: neem is more appropriate for Pitta-type skin conditions with heat, redness, and inflammation; turmeric is more appropriate for Kapha-type skin conditions with congestion, dullness, and impaired circulation.
Every part of the tree is documented
Classical texts document different parts of neem with distinct properties and applications. The leaf is documented for internal blood purification and skin conditions. The bark is documented for wound healing and fever. The seed oil (Nimba Taila) is documented for topical application in skin parasitic conditions and as a Lepa (paste) base. The flower is documented for digestive conditions and fever. The fruit is documented as bitter tonic. This multi-part documentation is unusual even among extensively documented herbs and reflects the tradition's thorough pharmacological exploration of this tree.
Classical pharmacological profile
Rasa: Tikta (bitter) and Kashaya (astringent). Predominantly bitter — making it the strongest Tikta herb in common Ayurvedic practice. The astringent component adds a wound-healing and tissue-consolidating dimension.
Guna: Laghu (light) and Ruksha (dry). The dryness, combined with cold Virya, makes neem strongly Vata-aggravating in excess — the primary contraindication noted in classical texts for constitutions or conditions with significant Vata.
Virya: Sheeta (cold). The cold potency is what makes it specifically effective for Pitta-type inflammations, fevers, and blood-heat conditions. It also makes it strongly Kapha-reducing in the digestive and respiratory systems.
Prabhava: Kushtaghna (specifically heals and purifies skin) and Krimighna (antimicrobial). These two special actions are documented in both Charaka Samhita and Sushruta Samhita and represent neem's most clinically significant classical properties.
Ayurvedic Pharmacopoeia of India monograph
API Volume II, Monograph No. 1.1.34 specifies: botanical source: leaves of Azadirachta indica A. Juss., Family Meliaceae; part used: leaves and bark (separate monographs); total ash (leaf): not more than 10%; alcohol-soluble extractive: not less than 8%; water-soluble extractive: not less than 14%. TLC identity uses nimbin and nimbidin as reference standards. A separate monograph covers Nimba Taila (neem oil) — specified as fixed oil from seeds, with specific gravity and saponification value requirements.
Classical contraindications
Charaka Samhita and Bhavaprakasha document strong contraindications for neem in: Vata-dominant constitutions — the Ruksha, Laghu, Sheeta qualities will severely aggravate Vata; emaciated or depleted persons (Kshaya) — the purifying action will worsen depletion; pregnancy — Sheeta Virya and potentially abortifacient properties documented in classical texts; and conditions of severe dryness (Shushka Kushtha) where the Ruksha Guna is contraindicated. Classical texts consistently prescribe neem in compound formulations rather than as a sole herb precisely because its purifying action requires balancing with nourishing herbs.