Shukra

Shukra (शुक्र) is, in Ayurveda, the seventh and most refined of the seven dhatus (bodily tissues) in men — the male reproductive essence, broadly corresponding to semen but understood as the densified product of the entire upstream tissue chain rather than as a fluid alone.

The Charaka Samhita gives a specific arithmetic for the production cost: approximately 40 days and 40 units of food to produce one unit of Shukra. This is the source of the traditional Ayurvedic and Yogic insistence that male sexual conservation has disproportionately large effects on overall vitality — the body is reclaiming its single most resource-intensive product.

When Shukra is conserved rather than expended, the classical description is that it transforms upward into ojas, the final refined essence stored in the brain.

Female counterpart

The female equivalent is rajas (sometimes also called artava), the female reproductive essence and creative energy. The male discipline is event-based (a discrete physiological event); the female discipline is cycle-based (conservation across the entire cycle). The underlying physiology — refinement of reproductive essence into ojas — is the same; the practical implementation differs by sex.

Primary sources

• Charaka Samhita, Sutrasthana and Chikitsasthana — the 40-day arithmetic and dhatu chain
• Ashtanga Hridayam — the Vagbhata corroboration
• Hatha Yoga Pradipika, chapters 3 and 4 — the practices that prevent expenditure and route Shukra upward

In motion

• See brahmacharya for the discipline that governs the conservation.
• See bindu for the related concept of the "seed drop" — the same essence understood as a discrete unit in the tantric body-map.