The short answer is no. If your diet provides sufficient micronutrients, additional vitamins or minerals will not alter performance. All stress (including exercise) requires additional nutrients because the body pushes through the water soluble vitamins faster than fat soluble vitamins or minerals. If you are eating a balanced diet then minimal additional stress – like that produced by mild to moderate exercise – probably do not require additional nutrients. If the micronutrients in your diet can not keep pace with your daily exercise routines then it is reasonable to add a small amount of B or C vitamins. The danger zone appears in adding too much which tends to put a huge burden on the kidneys. This can also be problematic if clients are taking anti-inflammatory medications such as ibuprofen because the latter tends to alter resorption of electrolytes via the kidneys increasing the probability of bad long-term side effects.
Muscular activity is heavily reliant on sufficient calcium and magnesium – which cannot be absorbed properly without Vitamin D. There should be sufficient in the diet of any client eating a wide range of foods that include dairy products. If you have vegan clients then a quick review of their nutritional regimen should help determine any gaps.
Sounds like you should listen to the nutritionists. They usually know what they are talking about.
Try hard to meet all your needs with your meals. If not then use supplements.
Usually athletes have higher nutritional and diet plans/needs. Its hard to eat that much sometimes and that is where supplemental powders and pills come in.
Supplements are just that…supplements. It means you can take all of your vitamins and other nutritional calories from regular food. For example, creatine is nothing new to the world of sports. Back in ancient Greece it was well known among the athletes and elite soldiers that red meat was the source of some extra nutritional value because it help them build more muscle and increase their strength and stamina (even though they didn’t know what creatine was back then). I strongly suggest to my clients to avoid supplements unless it has been prescribed by their dietitian or physician. The same goes for vitamins, unless there is a deficiency in your diet and/or body, there is really no need to spend all that extra money to buy something which you either don’t need or you can get it form a better diet.
Ideally you should get all the nutrients your body needs from real food, but sadly “real” food isn’t much real these days, hence the need for supplements could make sense.
I recommend VigRX Plus for performance enhancement