Ojas is a Sanskrit term that can be translated as “vigor” or “essence of vitality.”
In a nutshell, ojas is the vital energy that rules our immunity, strength, and happiness—three things we want to have in abundance. If our ojas is weak, our health, our spirits, and our energy sag.
The immune system consists of leukocytes (white blood cells), lymphatic organs such as the thymus and bone marrow, where lymphocytes (a type of white blood cell) are formed, as well as lymph nodes, spleen and lymphatic tissues that capture antigens.

Signs of High Ojas
Physical:
A glowing complexion
A sparkle in your eyes
Physical strength
Ample energy
Sharp sense organs
No aches and pains
Robust health and immunity
A sense of lightness in your body and mind
Mental and emotional:
Mental clarity and focus
Ample vitality
Creativity
A profound sense of well-being
Happiness and joy
Signs of Low Ojas
Physical:
Dry skin
Cold hands and feet
Weak sense organs (for example, sensitivity to light and sound)
Muscle pain and/or joint pain
Heaviness of body and mind
Impaired bodily functions
Frequent drowsiness and/or fatigue
A tendency to get sick frequently
Mental and emotional:
Mental confusion or fuzziness
Lack of focus
A consistently negative attitude
Anxiety
Depression and/or loneliness