What are Nutritional Supplements? They're vitamins, minerals and other nutrients used to support good health and treat illness. While it's always best to obtain all the nutrients you need through the food you eat, sometimes taking a supplement can help. For example zinc supplements seem to shorten the duration of the common cold. “Taking supplements isn't the answer to long-term good health” Combining a healthy diet with regular exercise and a positive mental attitude are still the best bet – and that's why our clinical nutrition team are a key part of Mint Health and Fitness.