Are the effects of a specific nutritional supplement from different brands the same? NO. The purity of ingredients, the concentration of active substances, the dose, and how much is absorbed by your body are decisive factors for a nutritional supplement's effect. Unfortunately, many nutritional supplement producers take advantage of the fact that some consumers do not understand the contents listed on the labels and use cheap, synthetic ingredients that often give little or no effect at all. In case of doubt, always ask a medical professional experienced in nutritional medicine who may help you get the most out of your nutritional supplements.