There are many general tonics available in the market that helps to increase the immune system. Many herbal energy boosters are also available and it becomes very difficult for a person to select the best tonic for boosting up the immune system. Safed Musli is one of the best herbal energy boosters that help to improve the immune system as well as cure sexual problems. It is also used as a general tonic and diet supplement due to its high nutritional value. This is used traditionally for boosting up the immune system and for the treatment of general debility.