Hello, gerivit forte is an ayurvedic medicine, primarily having shilajit as an active component. Controlled lab studies have shown that shilajit provides the body with energy and also increases vigor by increasing the body's testosterone levels. Although, in clinical practice there has been no clear evidence of that working, and even if it did, the amount would be insignificant. In most patients, suffering from low testosterone levels causing decreased energy levels, muscle loss and decreased vigor, its advisable to consult a doctor who can help you find the exact cause behind the lower testosterone levels and treat the underlying cause.