But detecting very small amounts of it in blood and other biological fluids can be difficult for health researchers, especially in the limited amounts available in laboratory experiments. (sciencedaily.com)
For instance, a slow - release version of the drug appears to be just as effective, even though only small amounts of it ever reach the liver. (newscientist.com)
This may be especially likely if their first few exposures to the food were small amounts of it in a different food — for example, a muffin made with eggs or milk. (babycenter.com)