Bioavailability is a term used to describe how much of a substance you absorb into the body when you take it. A substance’s bioavailability can be affected by many factors, including the type of food or drug the person or animal is taking and what other substances are in the stomach at the time.

If you have a higher-bioavailability substance, then more of it will enter the bloodstream—which means more pain relief (if you’re taking a painkiller), more energy, and so on.

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