Quantity of a material that becomes accessible to a human body for bioactivity when released through consumption, breathing, treatment, or dermis get in touch with. Pace of bioavailability depends on aspects such as the type of the material and the consumption of diet. The capability of a body to absorb lead, for example, is enhanced if the diet is lacking in calcium mineral or iron. The Bioavailability impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.