Many take these based on what they read, see and hear with a small percentage getting information from a Health Care Provider. Bioavailability is the measurement of how much of the nutrient gets into the cell. Another area of concern for supplement users are in the area of absorption rates and boiavailability rates.

Nutritional companies currently formulate their products based one the average person, both in nutrients selected and in recommended amounts. Thus, the consumer in not only buying unpersonalized supplements,but their is not a guarantee that the product has the ingredient listed in the labeled amounts. DNA Guided Nutritional Supplementation Millions of Americans are taking nutritional supplements in an effort to improve health, improve energy levels and just plain feel better. Absorption rates is the measurement of how much of the nutrient gets past the intestinal wall and into the blood stream. It is estimated over half of the population of the United States is using some form of vitamin supplement with a mass majority uncertain of the quality or the reasons behind the specific nutrient intake.

The government currently does not regulate the nutritional supplement industry.