What is bioavailability?

Bioavailability refers to how much of a nutrient or compound is absorbed and becomes available for your body to use. For supplements, it means the fraction that reaches your bloodstream or target tissues after digestion.

Different forms of the same nutrient can have different bioavailability. For example, magnesium glycinate is often better absorbed than magnesium oxide. Fat-soluble vitamins (A, D, E, K) are better absorbed when taken with a meal containing some fat. Form (tablet, capsule, liquid), other ingredients, and individual factors also affect absorption. Choosing a well-absorbed form and taking it as directed can help you get the intended benefit. This is educational only; consult a healthcare provider for personalized advice.