Long days and dark mornings in winter months can leave you feeling low, like you’re lacking the energy needed to work or train to your fullest. There are many reasons which may be causing these feelings, including stress, nutrition and lack of sleep. Certain vitamins and minerals, if lacking in your diet, can make you feel tired, foggy, slow and weak when it comes to the gym. If you are lacking, it’s a pretty easy fix to get you back on track. We’ve highlighted our best vitamins and minerals to help kick start your day and leave you feeling more alert this winter.