What Is Bioavailability?

Why It Matters for Supplement Brands

Bioavailability directly affects whether your supplement actually works. A 500 mg capsule means nothing if only 5% is absorbed. Many ingredients have naturally low bioavailability, which has driven the development of enhanced delivery forms — and the marketing claims that go with them.

How It Works

Bioavailability is determined by several factors:

1. **Absorption**: How efficiently the ingredient crosses the intestinal wall into the bloodstream. 2. **First-pass metabolism**: How much is broken down by the liver before reaching systemic circulation. 3. **Stability**: Whether the ingredient survives the acidic environment of the stomach. 4. **Form and formulation**: The chemical form (e.g., oxide vs. glycinate for magnesium), particle size, and co-factors.

Common strategies to improve bioavailability: • Liposomal delivery (encapsulation in lipid vesicles) • Phytosome technology (binding to phospholipids) • Co-administration with piperine (black pepper extract) • Micronisation (reducing particle size) • Chelation (binding minerals to amino acids)

Common Mistakes to Avoid

• ✗Making bioavailability claims without comparative human pharmacokinetic data
• ✗Assuming in vitro dissolution studies prove bioavailability in humans
• ✗Citing bioavailability improvements from a different form or dose than what's in the product
• ✗Not understanding that higher bioavailability doesn't always mean better clinical outcomes

Related Terms

See It in Action

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