For those suffering from diseases of the gut, and general cellular dysfunction, absorbing nutrients into the blood-stream can be extremely difficult. This is where nutrients given directly via the injectable route can be extremely helpful. For those with severe viral infections and post-viral fatigue, intravenous vitamin C in particular can be dramatically effective. For those undergoing surgery, injectable nutrients can help compensate for the high nutrient needs during this time. Intravenous zinc, B complex and vitamin C are particularly important at that time. Those suffering with cancer and having conventional medical treatment also have been found to have a greatly increased nutritional need. Many studies have demonstrated the effectiveness of intravenous glutathione in Parkinson’s Disease, and similar neurological conditions.