Ojas, Tejas and Prana in Ayurveda

Three traditional terms

In Ayurveda, the traditional medical system of India, ojas, tejas and prana are ideas about vitality. They are not lab values and not supplements. This page describes the traditional framework and what researchers have, and have not, tested. It does not describe a way to raise any of them.

Ojas

Ayurvedic writers use ojas for the essence of the body's tissues and for strength and resilience. One review notes that the texts describe ojas in several ways, including as the basis of life, as circulating nutrients, as the normal state of Kapha dosha, as the essence of the dhatus (tissues), and as the basis of resistance to disease (vyadhi kshamatva). [1] Another review describes ojas as representing robustness, strength and vitality, and as responsible for "subtle immunity" and mental resistance to stress. [2] A recent overview calls it a "vital essence associated with resilience, immunity, and vitality." [3] These are traditional meanings. Ojas is not an immune cell count or a nutrient. For how the immune system is understood in medicine, see How the Immune System Works.

The texts connect ojas with digestion. Charaka is quoted as saying that Agni is the cause of complexion, strength, health, nourishment, luster, ojas, tejas and prana. [4]

Tejas

Tejas (described as subtle vitality, fire or energy) is described in one review as representing the digestion and transformation of sensory impressions, intelligence, thoughts, perception and awareness. [2] See The Five Great Elements for the element framework.

Prana

Prana is described as the subtle life energy. According to the same review it controls breath, sensory perception and the thought process, and so is responsible for mind-body coordination. [2] For the breathing practices that use the word, see Pranayama: Cultural Overview and Specific Practices and Ayurveda, Yoga and Pranayama.

How they relate to the doshas

That review describes prana, tejas and ojas as the subtle counterparts of the biological doshas Vata, Pitta and Kapha, and says the status and integration of the three are linked to lifespan and healthspan in the tradition. [2] See What Are the Doshas?. The claim about lifespan is a traditional belief that this review states as the Ayurvedic position, and we did not find trials that test it.

What research has tried

• Ojas and cholesterol: a hypothesis. A 2025 paper argues that cholesterol and the products made from it could be candidate biomarkers for ojas. It builds on a proposal from 1995 and describes itself as raising and answering "provocative questions" to support a hypothesis. [1] That is an argument from text and existing literature, not a study that measured ojas. Do not use it to make decisions about cholesterol, tests or medicines; ask your clinician.
• Prana and the doshas: a pilot study. In a 2025 single-arm pilot of 91 Ayurveda students in Mysuru, India, researchers recorded hand sensations during two "pranic" techniques. Higher sensation intensity correlated with higher self-assessed Vata and Pitta scores. The authors call it exploratory and recommend control groups and objective validation. [5] Because it was single-arm and based on self-rated dosha questionnaires, it cannot show that prana exists as a measurable energy or that the techniques treat anything.
• Ojas as "immunity." Proper evidence not found that any Ayurvedic practice or herb raises "ojas" in a way that was measured and tied to fewer infections. We looked in PubMed and Europe PMC for ojas and immunity and found concept papers and case-based writing.

Evidence labels: traditional use only for ojas, tejas and prana; preclinical or exploratory for the biomarker proposals; marketing claim when products promise to "build ojas."