root, potion, pill, antibiotic (or) sequence variants in genes
nutrigenomic or pharmacogenetic http://www.sciona.com/article.asp?id=75 Drug Therapy: Pharmacogenomics Drug Disposition, Drug Targets, and Side Effects . It is well recognized that different patients respond in different ways to the same medication... it is estimated that genetics can account for 20 to 95 percent of variability in drug disposition and effects. . Although many nongenetic factors influence the effects of medications, including age, organ function, concomitant therapy, drug interactions, and the nature of the disease, there are now numerous examples of cases in which interindividual differences in drug response are due to sequence variants in genes encoding drug-metabolizing enzymes, drug transporters, or drug targets. . Unlike other factors influencing drug response, inherited determinants generally remain stable throughout a person's lifetime.