Bioavailability
How much of the medicine actually gets into your bloodstream.
Definition
How much of the medicine actually gets into your bloodstream.
Why it matters
This is the number that matters when people compare a compounded vial to a branded pen, or a salt form to a base form. Same milligrams on the label does not mean the same amount reaching you.
Source: this entry is drawn from “The Glossary” in FAT BITCH: Killing the Willpower Myth by Cat Clark (UNLIT Publishing, October 15, 2026). The full chapter has the context this page does not. Get on The First Copy List and we send the order link the day it goes live.
None of this is medical advice. It is educational material drawn from FAT BITCH: Killing the Willpower Myth by Cat Clark, and it does not replace your prescriber, your pharmacist, or your actual doctor. If something here does not match what your care team told you, go with your care team and bring this along to the conversation.