Ojas (vital essence)

The introduction says śukra dhātu, ojas and param ojas are the chief powers (prabhāva) of the body, kept in the body by brahmacarya, and that ojas greatly increases intelligence and memory and gives strength.

The introduction says that in the human body, whose dhātus are the most developed, the pratimūladhātus are present together with ojas-like essences (dhātusāra-teja), but the three dhātus lie at the root of them all.